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Sept. 29, 1942-
4r. A. LOGAN ET AL
2,296,936
v -AIRPORT LIGHTING AND TRAFFIC CONTROL SYSTEM
Filed'sept. 16, 19-39
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BY
THOMAS A. LOGAN
INIRE MOLNAR
ATTORNEYS.
Sept.29,1942.
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T. A. LOGAN ETAL
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T. A. LOGAN Er-AL
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Sept. 29, 1942-
T. A. LOGAN ETAL
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Filed Sept‘. 16, 1959
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Sept. 29, 1942.
T. A. LOGAQN ET AL
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AIRPORT LIGHTING AND. TRAFFIC CONTROL SYSTEM
Filed Sept. 16, 1959
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THOMAS A. LOGAN
IMRE MOLNAR
BYM,M;7; M M
ATTORNEYS.
2,296,936
‘Patented ‘Sept. 29, 1942
"UNITED STATES PATENT OFFICE
AIRPORT LIGHTING AND TRAFFIC
CONTROL SYSTEM
Thomas A. Logan and Imre Molnar, Chicago, Ill.,
assignors to Associated Electric Laboratories,
Inc., Chicago, 111., a corporation of Delaware
Application September 16, 1939, Serial No. 295,344
40 Claims.
(Cl. 177—352) _
av dispatcher station and improved apparatus
thereat for selectively controlling the illumina
The present invention relates to airport light
ing and tramc control systems. .
tion means and for observing the response of the
An airport conventionally comprises a ?ying
?eld having a plurality of airplane runways
thereon, some of the runways being arranged in
illuminating means to the control exercised there
over.
.
Another object of the invention is to provide
in an airport lighting system of the type noted,
improved numerical switching apparatus for se
with respect to still other of the runways. l1
lectively controlling the illumination means.
lumination devices of some form are usually as
A further object of the invention is to provide
sociated with the ?ying ?eld for the purpose of 10
in an airport tra?ic control system comprising a
lighting the runways when the ?ying ?eld is not
flying ?eld having a plurality of airplane run
otherwise clearly visible; and occasionally tramc
ways thereon and a plurality of tramc signaling
signals of some form are associated with the fly
means individually associated with the runways,
ing ?eld for the purpose of governing airplane
15 an improved arrangement for selectively control
traf?c on the runways.
ling the signaling means.
_In prior systems of the type noted it is often
A further object of the invention is to provide
di?icult for an airplane pilot to determine which
intersecting relationship with respect to other of
the rlmways and in non-intersecting relationship
in an airport traffic control system of the type .
one of several runways on the ?ying ?eld is in
noted, an improved arrangement for selectively
tended for his use as the several runways may
be lighted more or less to equal intensities. Fur 20 controlling the traii'ic signaling means, which is
so connected and arranged that the control of
the tra?iclsignaling means associated with con
thermore, crossing runways are frequently light
ed, rendering it impossible for the airplane pilot
to determine which of the con?icting runways is
‘intended for his use. Also, it often occurs that
?icting runways is positively prevented.
A further object of the invention is to provide
_ a pilot in an airplane aloft desires the use of a 25
runway on the ?ying ?eld to land his airplane at
the same time a pilot in an airplane on the ?y
ing ?eld desires the use of a runway thereon to
in an airport tra?ic control system oi?v the type
noted, a dispatcher station and improved ap
paratus thereat for selectively controlling the
tra?ic signaling means and for supervising the
control thereof.
In this event, neither
pilot may be positive that a runway is intended 30 Another object of the invention is to provide
in an airport tramc control system of the type
for his use, this confusion being further aggra
noted, improved numerical switching apparatus
vated when several runways on the flying ?eld
for selectively controlling the tra?ic signaling
are lighted simultaneously. Moreover, in sys
means.
'
tems of this type an airplane pilot is frequently
- take off in his airplane.
_ uncertain as to the proper direction of take off
or of landing 'upon a given runway on the
?ying ?eld, this uncertainty being most acute
The features of the present invention are il
lustrated as being incorporated in an airport
comprising a ?ying ?eld having a plurality of
to an airplanepilot aloft when the given run
airplane runways thereon, some of the runways
way on the ?ying ?eld is lighted. .
Accordingly, it is an object of the present in
vention to provide in an airport lighting system
being arranged in intersecting relationship with
respect to other of the runways and in non-inter
secting relationship with respect to still other
comprising a ?ying ?eld having a plurality of
airplane runways thereon and a plurality of il
‘of tra?ic signals are individually associated with
lumination means individually associated with
the runways, an improved arrangement for selec
tively controlling the illumination means.
Another object of the invention is to provide
in an airport ?ghting system of the type noted,
an improved arrangement for selectively control
ling the illumination means, which is so con
nected and arranged that the control of the'il
lumination means associated with con?icting run- _
ways is positively prevented.
'Another object of the invention is to provide
in an airplane lighting system of the type noted,
of the runways.
Illumination means and groups
, the runways. More particularly, the illumina
tion means associated with each runway com- '
prises rows of contact lamps disposed along the
margins thereof : and the group of tra?ic signals
associated with each runway comprises two tar
gets and two arrows. the targets‘beins associated
‘with the opposite ends of the runway and the‘
arrows being associated with’ the stretch, of the
runway. Further, the airport‘ comprises a dis
patcher station including apparatus for selec
tively controlling the illumination means and
2
2,296,936
the tra?ic signals and for supervising the control
thereof.
indication or the non-landing indication and the
established directional take o?.’ indication or the
In accordance with one feature of the inven
non—landing indication and the non-take-o?' in~
tion the system comprises a plurality of numeri
dication.
cal selector links, means at the dispatcher sta-v In accordance with a further feature of the
tion for selecting any one of the selector links
invention the group of tra?lc signals associated
for use and means including a signal trans
with each of the runways on the ?ying ?eld com
mitter at the dispatcher station operative to
prises ?rst and second tra?ic signals, each of the
transmit numerical signals to the selected selector
traffic signals beingvisible to an airplane pilot
link for selectively controlling the operation
aloft and to an airplane pilot on the ?ying ?eld
‘thereof. Two trunks are individually associated
and adapted to display two different indications.
with each runway, each of the trunks being ac
The ?rst and second traf?c signals are so con
cessible to each of the numerical switches. The
nected and arranged that the direction of air
group of tra?ic signals is so connected and ar
plane traffic on the runway is, determined by the
ranged that the two trunks individually asso
particular one of the signals displaying an indi
ciated with the associated runway are individually
cation and the assignment of the runway to the
selected by the selected numerical switch in ac- -
cordance with the direction of airplane tra?ic
use of an airplane aloft or to the use of an air
plane on the ?ying ?eld is determined by the
on the runway.
particular indication displayed by the one signal.
The selected selector link comprises means 20 Further, the system comprises means for selecting
operative in response to any numerical signal to
the control circuits of either one of the signals
test the selection marking of acorresponding one
associated with the runway and means for
of the trunks associated with one of the run
selectively governing the selected control circuits.
ways,.means for causing the selected selector link
Further features of the invention pertain to
to select the one trunk in the event it is tested as 25 the particular connection and arrangement of
not marked against selection, and means con
the ‘circuit elements of the system, whereby the
trolled by the selection of the one trunk for
above-outlined and additional operating features
marking the one trimk against selection.‘
are attained.
Further, the selected selector link comprises
The novel features believed to be characteristic
means for marking against seizure the other of 30 of the invention are set forth with particularity
the trunks associated with the other of the run-_
in the appended claims. ‘The invention, both as
ways arranged in intersecting relationship with
‘to its organization and method of operation, to
respect to the one runway. means controlled by
gether with further objects and advantages
the selection of the one trunk for testing the
thereof, will best be understood‘by reference to
seizure marking of the one trunk and means for 35 the following speci?cation taken in connection
causing the selected selector link to seize the one
with the accompanying drawings, in which
trunk in the event it is tested as not marked
Figure 1 illustrates diagrammatically an airport
against seizure. Also, each of the trunks com
lighting and traffic control system embodying the
prises a plurality of control circuits adapted to be
present invention; Fig. 2 illustrates diagram
' controlled to govern the illumination means as .40 matically an indicator panel incorporated in the
sociated ‘with the associated runway and selec
system: Fig. 3 illustrates diagrammatically a
tively to govern the group of tramc signals as
control panel incorporated in the system; and
sociated with the associated runway. Further,
Figs. 4 to 9, inclusive, taken together, illustrate
diagrammatically the details of the control appa
the dispatcher station comprises means opera- '
tive selectively to govern the control circuits in a
selected one of the trunks.
. ratus incorporated in the system.
In accordance with another feature of the in
vention the dispatcher station comprises a model
?ying ?eld including a plurality of illumination
indicator means and a plurality of signal indi
cator means individually associated with the run
ways on the model ?ying ?eld, and automatic
means controlled when the illumination means
and the tra?lc signals associated with one .of the
runways- on the ?ying ?eld are governed for
similarly’ governing the ' illumination indicator
50
Referring now more particularly to Fig. 1 of
the drawings, the airport there illustrated com
prises a ?ying ?eld I00 and a dispatcher control
tower or station llll, from which the entire fly
ing ?eld is clearly visible to the dispatcher. The
?ying ?eld llili comprises nine paved runways
over which airplane tra?ic may be routed in
either direction, whereby the runways comprise
eighteen directional runway ends Rl to RIO,
; inclusive, for- airplane tra?ic. Some of the run
ways are arranged in parallel relationship, while
means and the signal indicator means associated with the corresponding runway on the model v
others of the runways are arranged in intersect
ing relationship, thus providing a general criss
'cross pattern upon the ?ying ?eld. ‘Further, the
In accordance with a further feature of the .60 ?ying ?eld is provided with a paved rectangular
invention the traflic signals associated with each I boundary way communicating with each of the
?ying ?eld.
runway on the ?ying ?eld comprise signaling ' Y
means visible to an airplane pilot aloft and to an
‘airplane pilot on the ?ying ?eld; the signaling‘
means being adapted to display non-landing and
two different directional landing indications and -
non-take-o?" and two different directional take
off indications.
Also, the system comprises
means for preconditioning the circuits for con
runway ends in order to facilitate movement of
the airplanes from the hangers to the various
runway ends.
The general boundary of the ?ying ?eld Hill is
outlined by a number of boundary lamps indi
cated at I03; while all elevated structures dis
Posed adjacent the boundary of the ?ying ?eld
are provided with hazard lamps indicated at
trolling the signal means in order to establish 70 I“, Also, ?ood'lamps indicated at “I,- il'2, H3
the particular directional indications to be dis
and “4 are disposed substantially at the cor- Played by the signaling means and means for
ners of the boundary of the ?ying ?eld for gen
.selectively controlling the circuits. whereby the
eral illumination purposes. Further, a revolv
signaling means displays the established di
ing beacon indicated at H1 is associatednwith
rectional landing indication and the non-take-o?
the ?ying ?eld I00 for the purpose of. marking
2,296,936
3 .
cator panel which are adapted .to be illuminated
in accordance with the illumination of the con
tact lamps disposed along the margins of the
corresponding runway on the ?ying ?eld. For
example, the series of lamps 210 are disposed
the location of the airport to airplanes aloft,
and rotatable T lamps indicated at II5 are dis
posed upon the ?ying ?eld for the purpose of
signaling wind direction to airplanes aloft. Fi
nally, a number of gates are disposed along the
boundary of the ?ying ?eld to facilitate load
ing of the airplanes, each of the gates being pro
below the strip of-tran'slucent material on the
indicator panel corresponding to the runway
R5--RI5. Red and green lamps are disposed
below each of the arrows carried by the trans
example, the ?rst gate is provided with gate
lamps indicated at IIG. Finally, the margins of 10 lucent strips on the indicator panel which are
adapted to be illuminated in accordance with
each runway are provided with rows of ?ush-v
the illumination of the red and green lamps in
type contact lamps in order to mark the bound
the arrows associated with the corresponding
aries'thereof. For example, the margins of the
runway ends on the ?ying ?eld. For example,
runway R4-RI2 are provided with rows of con
the arrow ARI5 carried by the end RI5 of the
tact lamps indicated at I20.
1
translucent strip on the indicator panel has dis
In order to control airplane tra?lc upon the
vided with lamps for illumination purposes. For
runways, each runway end is provided with an
arrow and a target, the arrow being of the ?ush
posed therebelow a red lamp 2'“ and a green
plane on the ?ying ?eld. For example, the run- ‘
are adapted to be illuminated in accordance
common apparatus comprising the revolving
prises eighteen pilot lamps individually corre
lamp 212. Red, amber and green lamps are dis
posed below each of the'targets carried by the
type, visible to an airplane aloft, and the target
being of the elevated type, visible only to an‘ air 20 translucent strips on the indicator panel which
with the illumination of the red, amber and
way ends RI, R4, RI2 and RI5 are provided re
green lamps in the targets associated with the
spectively with arrows ARI, AR4, ARI2 ‘and
corresponding runway ends on the ?ying ?eld.
ARI5 and targets TRI, TR4, TRI2 and TRIS.
Preferably, each of the arrows is substantially 25 For example, the target TRIS carried by the end
RI5 of the translucent strip on the indicator
identical to the arrow ARI5, which comprises a
panel has disposed therebelow a red lamp 213,
red lamp I2I and a green lamp I22 disposed A
an amber lamp 214 and a green lamp 215.
therein; while each of the targets is substan
Further, the indicator panel 200 comprises three
tially identical to the target TRIS, which com
prises a red lamp I23,4an amber lamp I24 and a 30 groups of pilot lamps individually corresponding
to three selector links included in the control ap
green lamp I25 disposed therein.
paratus I02. Each group of pilot lamps com
In order to control the illumination of the
sponding to the eighteen runway ends on the ?y
_ beacon I", the ?ood lamps III, H2, H3 and
H4, the T lamps II 5, the boundary lamps I03, 35 ing ?eld. For example, the ?rst group of pilot
lamps individually associated with the ?rst se
the hazard lamps I04, and the gate lamps and
selectively to control the various arrows and tar
, lector link in the control apparatus I02 com
gets individually vassociated with the runway
ends, control apparatus I02 is provided in the
dispatcher control tower IOI. Also, there are 40
provided in the dispatcher control tower IN a
control panel 300 and an indicator panel 200,
the control panel 300 being arranged to govern
the control apparatus I02 and the indicator
panel 200 being arranged to indicate illumina
tion of the runways and the settings of the var
ious‘arrows and targets associated with the run
way ends. Preferably, the control panel 300
is disposed in a substantially horizontal position‘
on the top of the desk of the dispatcher, while
- the indicator panel 200 isdisposed in either an
inclined or a vertical position in front of the desk
prises the pilot lamps 20I to 2I8, inclusive, which
respectively correspond to the runway ends RI
to RI8, inclusive. Similarly, the ?rst pilot lamp
22I in the second group of pilot lamps individually
associated with the second selector link in the
control apparatus I 02 is individually associated
with the ?rst runway end RI; while the ?rst pilot
lamp ,2“ in the third group of pilot lamps indi
vidually associated with the third selector link in
the control apparatus I02 is individually asso
ciated with the runway end RI. It is noted that
when one of the selector links in the control ap
paratus I02 is operated to select one of the run
way ends on the ?ying ?eld, the pilot lamp corre
sponding to the selected runway end in the group
of pilot lamps corresponding to the ‘selected link
of the dispatcher, so that the dispatcher may
readily operate the apparatus on the control
utilized is illuminated.
panel 300 and observe upon the indicator panel '
200 the illumination of the runways and the set
nation of the pilot lamps in the three groups of
pilot lamps indicates to the dispatcher the par
Accordingly, the illumi- .
ticular runway end which has been selected by a '
tings of the arrows and targets associated with
particular selector link in the control appara
the runway ends on the ?ying ?eld I00.
tus I02.
7
Referring now to Fig. 2, the illustrated indi
Referring to Fig; 3, the control panel 300 com
cator panel 200 comprises an opaque sheet which 60
prises three groups of keys individually corre
is cut out and ‘covered with translucent material
sponding to the three selector links in the con
in order to provide‘ a general crisscross pattern
trol apparatus I02. For example, the ?rst group
corresponding precisely vto the crisscross pat
of keys comprises the illustrated keys IKI, IK2
tern of the runways on the ?ying ?eld I00. Also,
and IK3; the second group of keys comprises the
the ends of the various strips of translucent ma
illustrated keys 2KI, 2K2 and 2K3; while the
terial carry a number of characters RI to RI8;
third group of keys comprises the illustrated keys
inclusive, identifying the corresponding runway
3KI, 3K2 and 3K3. Preferably, the three keys in
ends on the ?ying ?eld, a number of arrows ARI
each of the three groups of keys are connected
to ARI8, inclusive, identifying the correspond- .
ing arrows associated with the runway ends on 70 and arranged to perform similar functions in the
respective selector links in the control apparatus
the ?ying ?eld, and a number of targets TRI
I02. For example, the key IKI comprises a se
to TRI8, inclusive, identifying the correspond
lect-release key for the ?rst selector link; the key
ing ‘targets associated with the runway ends on
IK2 comprises a take o?-land-emergency stop
the ?ying ?eld. A series oflamps are disposed
75 key for the ?rst selector link; while the key IK3
.below each of the translucent strips on the indi
4
2,298,936
comprises a trai?c on-o?-runway and traf?c on
key for the ?rst selector link.
Also, the control panel 300 comprises a group
of common keys, including the keys KI to KI 0,
inclusive, the keys KI to K6, inclusive, being ar
ranged to control the illumination of’ the gate
lamps associated with the gates I to 0, respec
tively; the key K1 being arranged to control. the
illumination of the boundary and hazard lamps;
the key K8 being arranged to control the il
lumination of the T lamps; and the key K3
being arranged to control the illumination of the
revolving beacon. Finally, the key KIO is arranged
to control the intensity of illumination of the
' the impulse receiver unit, the ?rst selector link
being indicated at 035.
This common equipment comprises a step
down transformer 445, having a primary wind
ing 445 connected by way of a control switch
$400 to a source of low voltage A. 0. supply
401, and a secondary winding 441 included in
the various control circuits governed by the keys
on the control panel 300.
Also. this common
10 equipment includes a power transformer ill
having a primary winding arranged in three sec
tions 6“, H2 and M3, and a secondary winding
ill, and two choke coils H5 and H0. The vari
_ contact lamps disposed along the margins of the 15 ous series of contact lamps I20, 635, 630, etc.,
disposed along the marginsof the runways on
various runways on the ?ying ?eld. More par
the
?ying ?eld, are adapted to be respectively .
ticularly, by manipulating the key KIII the il
connected across the secondary winding 6“ of
lumination of the contact lamps disposed along
the power transformer 0I0 by a number of slave
the margins of the various runways on the ?ying
relays R620, R622, R624, etc.; while the various
?eld may be varied to three di?erent intensities; 20 sections
of the primary winding of the power
namely, normal, dim and bright. Further, a
transformer 6I0 are adapted to be connected in
group of pilot lamps 3“ to 3I9, inclusive, is pro
a predetermined manner to a source of high volt
vided on the control panel 300 and individually
age A. 0. supply 00I by a control switch S502
associated ‘with the keys KI to K9, respectively,
these pilot lamps being so connected and ar 25 and three'two-pcsition switches 85", S520 and
S530. Each of the two-position switches S5l0,
ranged that they are illuminated in accordance
S520 and S530 is of the heavy duty, double’ act
with the bperation of the respective keys. Also,
ing, solenoid type, comprising operating and re
four keys KI I, KI2, KI3 and KI4 are provided on
leasing windings. A circuit network is pro
the control panel for the purpose of controlling
vided
for controlling the operating and releasing
the illumination of the respective ?ood lamps I I I, 30 windings
of the two-position switches S5I0, S520
H2, H3 and I I4. ‘Further, there is provided on
the control panel a push button pattern 340 which
corresponds precisely to the‘ general criss-cross
pattern of the runways on the ?ying ?eld. Also,
and S530, which comprises three switch control
relays R4I0, R4I5 and R420, three lockout relays
R425, R430 and R435, and a control relay R450.
Further, the common equipment comprises a
the push button pattern 340 comprises eighteen 35 group
of six gate relays, including the gate re
push buttons PRI to PRI8, inclusive, respectively
lay
R550;
a group of six gate slave relays, in
positioned on the pattern 340 in accordance with
cluding the gate slave relay R5501 a group of
the positions of the various runway ends on the
eighteen target relays, including the target relay
?ying ?eld. More particularly, each of the push
R540; and a group of eighteen target slave re
buttons is connected and arranged in such a 40 lays, including the target slave relay R555. It
manner that it is operative, when depressed, to
is noted that the gate relays are individual to
cause the amber lamp in the target associated
the respective gates associated with the ?ying
with the corresponding runway end on the ?ying _
?eld, the gate relay R550 being individual to
?eld to ?ash and to cause the amber lamp in the
the ?rst gate and being operative to complete
target associated with .the corresponding end of 45 a circuit for energizing the gate lamps II 5 asso
the translucent strip on the indicator panel to
eiated with the first gate; while the target relays
?ash. For example, when the push button PRI5
are individual to the respective targets assor
is depressed, theamber lamp I 24 in the target
ciated with the runway ends on the ?ying ?eld,
TRI5 associated with the corresponding runway
the target relay R540 being individual to the
end R15 on the ?ying ?eld is ?ashed and the 50 target TR5 associated with the runway end R5
amber ‘lamp 214 in the target TRI5 associated
on the ?ying ?eld and being operative to com
with the corresponding end R I 5 of the translucent
strip on the indicator panel is ?ashed.
plete a circuit for illuminating the amber lamp
I30 in the target TR5. Each, of the circuits
for illuminating the amber lamps in ‘the various
a number dial 30I comprising a rotatable ?nger 55 targets includes a ?asher in order to cause the
disk 302 and a ?nger stop 303, this number dial
amber lamp to ?ash, the circuit for illuminating
being of the usual automatic telephone type. The
the amber lamp I30 in the target TR5 including
number dial 30l is so connected and arranged
the ?asher 553. Also, this common equipment
that it is operative to control a selected one of
includes a boundary and hazard relay R545
the selector links inthe control apparatus I02 in 60 and an associated boundary and hazard slave
order to cause the selected selector link to select
relay R555, the boundary and hazard relay R545
any desired one of the runways on the ?ying ?eld
being operative to complete the circuits for il
for the purpose of governing the illumination of
luminating the boundary and hazard lamps I03
the contact lamps disposed along the margins of
and I04.
the selected'runway and the settings of the sig 65 It is noted that the gate slave relays are
nals individually associated with the opposite ends
arranged to control the illumination of the group
thereof.
of pilot lamps disposed on the control panel
Referring now to Figs. 4 to 9, inclusive, the ' 300, the gate slave relay R550 being arranged to
control apparatus I02 comprises certain com
control the illumination of the ?rst pilot lamp
mon equipment associated with the common keys 70 3“ in this group of pilot lamps. The boundary
KI to KIO, inclusive, on the control panel 300
and hazard slave relay R555 is arranged to con
and’ withthe three selector links, an impulse
trol
the illumination of the pilot lamp 3" in
receiver unit ‘I00 commonly'associated with the
the
group
of‘ pilot lamps on the control panel
three groups of keys on the control panel, and
three selector. links commonly associated with 7 300; while the target slave relays are arranged _
Finally, the control panel 300 is provided with
5
to control the illumination of. the amber lamps
2,396,988
in the various targets associated with the minia
ture. runways on the indicator panel 200, the
target slave relay R585 being arranged to con
trol the illumination of the amber lamp 215 in
the target TR5 associated-with the miniature
runway end R5 on the indicator panel.
,
_
5
. with the miniature runway ends on the indicator
panel, the slave relay R940 being arranged to
control the red lamp 282 in the arrow ARI2; a
group of eighteen slave relays, including the slave
relay R995, for controlling the illumination of
the green lamps in the various arrows associated ,
with the miniature runway ends on the indicator
Further, the common equipment comprises a
panel, the slave relay R935 being arranged to
group of eighteen take o? relays accessible to
control the green lamp-28I in the arrow ARI2;
each of the selector links and individually cor
responding to the eighteen runway ends on the 10 and a group of nine slave relays, including the
slave relay R920, for controlling the illumination
?ying ?eld, this group including the take oiI
of the series of lamps disposed below the trans
’ relay R900, individually associated with the run
lucent‘strips on the indicator panel, the slave
way end RI2; a group of eighteen land relays
relay R920 being arranged to control the illumi
accessible to each of the selector links and indi
vidually corresponding to the eighteen runway 15 nation of the series of lamps 215 disposed below
the translucent strip R4--RI2 on the indicator
ends on the ?ying ?eld, this group including the
panel.
land relay R905 individually associatedwith the
The impulse receiver unit 100 comprises a
runway end RI2; a group of eighteen emergency
rotary switch $180, including three wipers 18l,
stop relays accessible to each of the selector links
and individually corresponding to the eighteen 20 183 and 185 provided with individually asso
runway ends on the ?ying ?eld, this group in
cluding the emergency stop relay R9I0 indi
vidually associated with the runway end RI2;
and a group of nine contact lamp relays acces
ciated contact banks 182, 184 and 186 and a mag
net M135 for simultaneously driving the wipers
noted into engagement with the contacts in the
associated contact banks. Also, a set of switch
sible to each of the selector links and individ 25 springs S1I8 is operatively associated with the
wipers noted of the rotary switch S180 and ar
ually corresponding to the nine runways on the
ranged to be operated into engagement when
?ying ?eld, this groupincluding the contact lamp
the wipers of the rotary switch are operated away
relay R9 I5 individual to the runway R4—RI2.
from their normal positions. Further, the im—
- It is noted that the various take off, land and
emergency stop relays control the illumination 30 pulse receiver unit 100 comprises a start relay
R140, a hold relay R150, a test relay R130,,a
of the red and green lamps in the targets and
switching relayR150, a slave relay R190 and a
arrows associated with the various runway ends
circuit network.
.
on the ?ying ?eld; while the various contact
Preferably, each of the'selector
iden
lamp relays control the illumination of the vari-,
ous series of contact lamps disposed along the 35 tical with the illustrated ?rst selector ‘link 895,
which comprises a rotary switch S800 including.
margins of the various runways on ‘the ?ying
?ve wipers 80I, 803, 805, 801 and 809 provided
?eld. For example, the take oil relay R900 is
with individually associated contact banks 802,
arranged to control the illumination of the red.
804, 805, 808 and 8I0 and a magnet M880 for
lamp I44 in the arrow ARI2 associated with the
runway end RI2, the illumination of the green 40 driving the wipers noted into engagement with
the contacts in the associated contact banks.
lamp I41 in the target TR4 associated with the
Also, the selector link 895 comprises a- rotary
runway end R4, and'the illumination of the green
switch $820 including ?ve wipers MI, 823, 825,
lamp I62 in the target TRI2 associated with the
821 and 829 provided with individually associated
runway end RI2; the‘ land relay R905 is ar
ranged to control the illumination of the red 45 contact banks 822, 824, 826, 828 and 830 and a
magnet M885 for driving the wipers noted into
lamp I40 in the target TRI2 and the illumina
engagement with the contacts in the associated
tion of the green lamp I43 in the arrow ARI2;
contact banks. Further, the selector link 895
the emergency stop relay R9I0 is arranged to
comprises a test relay R850, a lockout-relay R840,
control the illumination of the red lamp I44 in
the arrow ARI2, the red lamp I40 in the target 50 nine marking relays including the marking relay
R890, which individually corresponds to the nine
TRI2, and the red lamp I45 in the target TR4:
runways, a stop relay R860, a switch-through re
and the contact lamp relay R9I5 is arranged to
lay R810 and a circuit network. Also, it is noted,
control the energization of the slave relay R620,
that the wiper‘ 809 and associated contact bank
thereby to control the illumination of the series
of contact lamps I20 disposed along the margins 55 "0 of the rotary switch S800 are connected and
arranged to control the illumination of the pilot
of the runways R4-RI2 on the ?ying ?eld..
lamps in the ?rst group of pilot lamps, includ
Also, the common equipment comprises a group
ing the pilot lamp 2I2, on the indicator panel.
of eighteen slave relays, including the slave re
The connection and ‘arrangement of the im
lays R980 and, R950, for controlling the illumi
nation of- the red lamps in the various targets 6.0 pulse receiver unit 100, the selector links and
the control apparatus therefor are disclosed and
associated with the miniature runway ends on
claimed in the copending application of Imre
the indicator panel, the slave relays R930 and
Molnar, ‘Serial No. 295,345, ?led September 16,
R950 being arranged to control the illumination
1939.
of the red lamps 283 and 290, respectively, in
Before proceeding with a detailed description
the targets TRI2 and TR4; a group of eighteen 65
of the operation of the lightingv and tra?lc con
- slave relays, including the slave relays R925 and
. trol system, a brief explanation of the method
R945‘, for controlling the illumination of the
of controlling the signals ‘associated with the
green lamps in vthe various targets associated
opposite ends of the various runways on the
with the miniature runwayends on the indicator
panel, the slave relays R925 and R945 being ar 70 ?ying ?eld in order to coordinate the movements '
of dii‘l’erent airplanes is set forth below.
ranged to-control the green lamps 285 and 288,
In order to control the take oi! of an airplane
respectively, in the targets TR.I2 and TR4; a
from the ?ying ?eld I80 the dispatcher in the
group oi’ eighteen- slave relays, including the
slave'relay R940, for controlling the illumination
dispatcher control tower III ?rst determines in
of the red lamps in the various arrows associated 75 accordance with the direction-oi’ the prevailing
6
2,296,936
wind the particular runway which is to be
utilized by the airplane in taking oil‘ and the
light. The display'of the red light byvthe near
direction of take oil! on the runway and then
views the ?ying ?eld and the indicator panel
?ying ?eld that he may not safely taxi his air
target indicates to a pilot in an airplane on the
plane upon the near end of the selected runway;
200 in order to satisfy himself that the ?ying
the display of the red light by the remote target
field is clear as far as the determined runway is
concerned. The dispatcher then selects the par
ticular one of the three selector links which is
to be utilized by operating the select keyon the
control panel 300 corresponding to the selected
indicates to a pilot in an airplane upon the near
end of the selected runway that his airplane may
not safely take oil’ thereupon; while the display
of the red light by the near arrow indicates to a
10 pilot in an airplane aloft that he may not safely
link. The dial 30l on the control panel is then‘
operated to cause the selected link to select the
determined runway. After the determined run
way has been selected, the dispatcher operates the
take o?! key of the selected link on the control 15
utilize the selected runway to land his airplane.
In order to conserve time in the handling of
airplane trai?c, the dispatcher may utilize the
push button pattern 340 on the control panel 300,
thereby to cause the target associated with any
with the opposite ends of the selected runway to
light. ‘This may be accomplished merely by de
pressing the particular push button on the push
button pattern 340 corresponding to the target
panel, thereby to cause the ‘signals associated
be set in a predetermined manner. More par
ticularly, the target associated with the near
one of the runways to display a ?ashing amber
end of the selected runway displays a green light; 20
associated with the desired runway end on the
the target associated with the remote end of the
?ying ?eld. This facility is utilized particularly
selected runway displays a green light; and the
in directing airplanes o? of the ?ying ?eld after
arrow associated with the near end of the selected
they have landed on a selected one of the run
runway displays a red light. The display of the
ways.
For example, assuming that an airplane
green light by the near target indicates to the 25
has landed on the runway end RI! of the ?ying
pilot in the airplane that he may safely taxi
?eld'and is taxiing toward the center intersection,
his airplane upon the near end of the selected
the dispatcher in the dispatcher control tower
runway; the display of the green light by the
i0! may operate the push button PR5 on the
remote target indicates to the pilot in the air
push
button pattern 340 corresponding to the tar
plane that his airplane may proceed along the 30
get TR5 associated with the runway end R5 on
selected runway and take oil; while the display of
the ?ying ?eld, thereby to cause the target TRS
the red light by the near arrow indicates to a
to
display a ?ashing amber light. The display
pilot in an airplane aloft that the selected run
of
the ?ashing amber light by the target TRS
way is in use and that he may not safely land his
indicates to the pilot in the airplane taxiing along
airplane thereupon.
In order to control the landing of an airplane
upon the ?ying ?eld I00 the dispatcher in the
dispatcher control tower l0| proceeds to select
one of the runways with a selected one of the
'
35 the runway end R12 toward the center intersec
tion that he is to turn into the runway end R5
upon reaching the center intersection, thereby to
clear the runway end RI! for the use of other
airplanes.
~
links in the previously described manner, and 40 Further, it is noted that the control apparatus
then operates the land key of the selected link
I02, the signals on the ?ying ?eld I00 and the
on the control panel, thereby to cause the signals
indicator panel 200 are so connected and ar
associated with the opposite ends of the selected _
ranged that, when the dispatcher controls at
runway to be set in a different predetermined
control panel 300 the signals associated with
manner. More particularly, the target associated 45 the
the opposite ends of any one ‘of the runways
with the near end of the selected runway dis- ' on the ?ying ?eld to display predetermined in
plays a red light, the target associated with the
dications, the signals associated with the oppo
remote end of the selected runway is dark, and
site ends of the corresponding runway on the
the arrow associated with the near end of the
selected runway displays a green light. The dis 50 miniature pattern of the ?ying ?eld on the in
dicator panel 200 are controlled to display like
play of the red light by the near target indicates
indications.
Accordingly, the signals displayed
to a pilot in an‘ airplane on they ?ying ?eld that
on the minature pattern of the ?ying ?eld on
the selected runway is in use and that he may not '
the indicatonpanel 200 always correspond to the
safely taxi his airplane upon the near end of the
actual signals displayed on the ?ying ?eld.
selected runway; and the darkened condition of 55
Considering now the operation of the control the remote target indicates to a pilot in an air
apparatus I02 by the dispatcher in the dispatcher
plane on the ?ying ?eld that the selected run
control tower i0l, after the dispatcher has re
way is in use and that he may not safely take
termined in accordance with the direction of the
off thereon; while the display of the green light . prevailing wind on the ?ying ?eld a particular
by the near arrow indicates to the pilot in the
one of the runways on the ?ying ?eld for use
airplane aloft that the selected runway is in
and the direction of airplane tra?‘ic thereon, he
readiness for use to land his airplane thereupon.
selects one of the selector links to be utilized
Finally. it is noted that the dispatcher in the ' to
select the, determined runway, as previously
dispatcher control tower "I, after selecting a
noted. Assuming that the dispatcher selects the
runway on the ?ying ?eld for the use of either 65 first selector link 895 to be-utilized to select the
an airplane which is to take o?.’ thereupon or an
determined runway on the ?ying ?eld, this is ac
airplane which is to land thereupon, may block
complished by operating the key IKI on the
the actual use of the selected runway by operat
control panel 300 to its select position. When
ing the emergency stop key of the selected link
the key IKI is operated to its select position, a
I on the control panel, thereby to cause the signals 70 circuit is completed, at the contacts 124 thereof,
‘associated with the opposite ends of the selected
runway to be set in a further predetermined
manner. More particularly, the near target dis
.plays a red light, the remote target displays a
red light, and the near arrow displays a red 75
,for energizing in series the upper and lower
windings of the'lockout relay R840. This circuit
extends from ground by way of the contacts 124
.of the key IKI, C195; the upper winding of R840,
the contacts 852, the lower winding of R840 and
2,296,936
7
ergizing the winding of the ‘magnet M135 of the ,
‘ rotary switch S100, to complete, at the contacts
the resistor 015 to battery. It is noted that the
point between the terminal of the lower winding
152, an obvious path for applying battery poten
of the lookout relay R040 and the resistor 015
is multipled to the other selector links. Ac~
cordingly, the upper and lower windings of the
lockout relay R340 are su?lciently energized to
' tial by way or the resistor 110 to the conductor
C133, to complete, at the contacts 153, an ob
vious‘ alternative holding circuit for energizing
the winding thereof, and to interrupt, at the
‘contacts 154 a point ina circuit, traced herein
‘ cause this relay to operate only in the event the‘
keys corresponding to the key IKI in the other
after, for energizing the lower winding of the selector links occupy their normal positions. As
switching
relay R150.
'
.
suming that the above-mentioned condition pre 10
After. the ?nger disk 302 of the dial 3,0l is re
vails in the second and third selector links, the
leased, the dial operates to transmit the corre
upper and lower windings of the lookout relay
R040, are su?iciently energized .at this time in , sponding number of impulses, as previously
noted. More particularly, the contacts 1l5 of
order to cause the lookout relay R840 to operate.
Upon operating, the lookout relay R040 com 15 the dial 30l are operated into engagement and
disengagement a number of times corresponding
pletes, at the contacts “I, an obvious holding
to the number of impulses to be transmitted.
circuit for energizing the upper winding thereof
Each time the contacts "5 of the dial 30l are
and an obvious path for short-circuiting the
actuated into engagement, the previously men
lower winding thereof, thereby to retain the
lookout‘ relay R840 in its operated position and 20 tioned circuit for energizing the winding of the
magnet M135 of the rotary switch S180 is com
to load the resistor 015. when the resistor 815
pleted, assuming that the keys 2K| and 3'Kl in
is thus loaded by the lookout relay R0“ in the
dividually associated with the second and third
?rst selector link 305, there is not adequate po- '
tential between ground and the multiple point
selector links occupy their normal positions. The
to the lockout relays in the second and third se
last-mentioned circuit extends from ground by '
lector links to permit operation of the lookout
relays in these
Accordingly, the second.
and third selector links cannot be utilized while
the key lKl of the first selector link 805 oc
cupies its select position.
v
Also, upon operating, the lockout relay R000
1 prepares, at the contacts 842, a point in a cir
way 'of' the contacts 161 of the key 3K1, C159,
the contacts160 of the key IKI, C158,. the con
‘ tacts 121' of the key IKI, C134, the contacts H5
of the dial 30l, C132, the contacts 15l and the 30
winding of ,M135 to battery. Each time the
above-traced circuit is completed, the magnet
M135 operates to condition the wipers noted of
the rotary switch $100 .to be driven one step in
cuit, traced hereinafter, for energizing the upper
the clockwise direction; and each ‘time this circuit
winding of the test relay R050, prepares at the
contacts 843, a point in a circuit, traced here: 35 is interrupted, the magnet M135 restores‘, thereby
to cause the wipers noted of the rotary switch
inafter, for energizing the lower winding of the
$180 to be driven one step in the clockwise direc
test relay R350, prepares, at the contacts 0“,
‘ tion. Also, each time the magnet M135 oper
a point in a circuit, traced hereinafter, for en
ates, it completes, at the contacts 136, an obvious
_ ergizing the winding of the magnet M000 of the
rotary switch S300, interrupts, at the contacts 40 circuit for energizing the winding of the slave
relay R190, thereby to cause this relay to oper
805, a point in a circuit, traced hereinafter, for
ate. Accordingly, the circuit for energizing the
winding of the slave relay. R190 is intermittently
the rotary switch S020, and interrupts, at the
completed as the magnet M135 operates inter
contacts 046, a point in a circuit, traced herein
after, for energizing the winding of the stop relay 45 mittently; however, the slave relay R130 does
not restore during the intermittent restoration
R380v and for illuminating the pilot lamp ar
ranged in the ?rst group of pilot lamps on the ' of the magnet M135, as this relay is of the slow
energizing the winding of the magnet M005 of
~indicator panel 266i and corresponding to the
selected runway end on the ?ying ?eld.
to-release type. In fact, the slave relay R100
- does not restore until a short time interval fol
The dispatcher then operates the dial 30! in 5.0 lowing the ?nal restoration of the magnet M135.
Upon operating, the slave relay R190 completes,
runway end on the ?ying ?eld by inserting his
at the contacts 191, the previously mentioned
?nger in the appropriate hold‘ in the ?nger disk, , path for short-circuiting the winding of the test
relay R130, this path extending from ground by
> 302 and then rotating the disk until his ?nger
engages the ?nger stop 303. The ?nger disk 302 55 way of the contacts 19L the winding of R130,
then returns to its normal position, thereby to
the contacts 142, G133 and the contacts 1" of
cause the dial 301 to transmit a corresponding
the dial 30l to ground. Also, when the wipers
noted of the rotary switch 5100 ‘are operated
number of impulses. .When the dial 3" is op
' accordance with the number of the determined
erated away from its normal position the con-.
away from their normal positions one step in the
clockwise direction, the set of switch springs S113
tacts 150 and 111 thereof are actuated into engagement in order respectively to complete ‘a
is actuated into engagement, thereby to prepare
path, traced hereinafter, for short-circuiting the'
an alternative circuit, traced hereinafter, for en
winding of the test relay lR130 and to complete
ergizing the winding of the magnet M135, this‘ _
a circuit for energizing the winding of the hold
circuit being retained interrupted at the contacts
relay R150. The circuit for energizing the wind 65 122 of the key IKI at this time. >
.
>
At the conclusion of the first digit the ?nger
ing of the hold relay‘ R150 extends from ground
disk 302 of the dial 30! occupies its normal posi- f
by way of the wiper 105 and engaged normal con
- tion and the contacts H5, H6 and H1 of vthe dial
tact in the associated contact bank 135 of the
30l are operated into disengagement. Also, at
‘rotary switch 8180, C100, the contacts 103, C130,
the contacts 1" of the dial 50!, the contacts 120 70 this time,- the wipers noted of the rotary switch
8100 are operated away from their normal posi
of the key IKI, C133, the contacts 1“, and the
winding of R150 to battery. when energized ‘ tions a predetermined number of steps corre
sponding to the digit transmitted'by the dial 301.
over the above-traced circuit, the hold relay
When the contacts 111 of‘the dial 30] are actu
1 R150 operates to prepare, at the ‘contacts 15!,
ated
into disengagement. the previously traced
a point in a circuit, traced hereinafter, for en
8
‘ 2,296,986
circuit for energizing the winding‘ of the hold
relay R150 is interrupted thereat; however, they
_hold relay R150 does not immediately restore,
this relay being of the slow-to-release type. Also,
when the contacts "6 of the dial 30I are actu
ated into. disengagement the previously traced
_ hereinafter, for energizing the lower winding of .
the switching relay R180.
At this time the wipers noted of the rotary
switch S180 engage the ?rst contacts in the as
sociated contact banks as previously explained.
Speci?cally, the wiper 185 of the rotary switch
path for short-circuiting the winding of the test
S180 engages the ?rst contact in the associated
relay R130 is interrupted thereat. When the
contact bank 106, thereby to complete the pre
contacts 1I5 of the dial 30I are actuated into
disengagement the previously traced circuit for 10 viously mentioned circuit for energizing the lower
winding of the switching relay R160, this circuit
energizing the winding of'the magnet M135 is
extending from ground by way of the wiper 105
interrupted. The subsequent operation of the
and engaged ?rst contact in the associated con
test relay R130 depends upon several conditions,_
tact bank 186, C140, the contacts 154 and the
including the particular digit dialed as will ap
lower winding of R160 to battery. When ener
pear hereinafter.
gized over the above-traced circuit, the switch
Assuming that the digit dialed at the dial 30!
ing relay R160 operates to complete, at the con
_ is
the digit 1, in this event the wipers noted of
tacts 166, a holding circuit for energizing the
the rotary switch S180 are moved into engage
upper winding thereof, this ‘ circuit extending
ment with the ?rst contacts in the associated
contact banks after the magnet M135 is deener 20 from ground by way of the contacts 161 of the
key 3Kl, C159, the contacts 168 of the .key ZKI,
gized. However, prior to'the restoration of the
C158, the contacts 12I of the key IKI, C151, the
slave relay R100 and subsequent to the return of
contacts 166 and the upper winding of R160 to
the ?nger disk 302 of the dial 30I to its normal
battery. Also, upon operating, the switching re
position, a circuit is completed for'energizing the
lay R160 interrupts, at the contacts 16l, an ob-V
winding of the test relay R130 in the event the
vious
connection between the wiper 18I of the corresponding runway end RI on the ?ying ?eld
rotary switch S180 and the conductor C133, com
has not been previously selected by either the
pletes, at the contacts 162, an obvious connec
second or third selector links. This circuit ex
tion between the wiper 183 of the rotary switch
tends from ground by way of the contacts 19I,
S180
and the conductor C133, interrupts, at the
the winding of R130, the contacts 142, C133, the 30 contacts
163, a further point in the previously
contacts 152 and the resistor 119 to battery.
traced original path for applying ground poten
When energized over the above-traced circuit, the
tial by way of the wiper 105 and engaged normal
test relay R130 operates to complete, at the con
tacts 13I, a circuit for energizing the lower wind
ing of the start relay R140. This circuit extends
from ground by wayrof the contacts 161 of the
key 3KI, 0159,- the contacts 168 of the key 2KI,
C158, the contacts 12I of the key IKI, the con
tacts 13I and the lower winding of R140 to bat
contact in the associated contact bank 106 to
the conductor C138, and completes, at the con
tacts 164, an obvious alternative path for ap
plying ground potential by way of the wiper 185
and engaged ?rst contact in the associated con-'
tact bank 186 to the conductor C138. 'Finally,
the switching relay R160 prepares, at the con
tery. When energized over the above-traced cir 40 tacts 165, a point in a circuit, traced herein
cuit, the start relay R140 operates to complete, at
after, for energizing the upper winding of the
- the contacts 146, an obvious holding circuit for
start relay R140. At this time battery potenenergizing the lower winding thereof. Also, upon
tial is applied by way of the resistor 119, the
operating, the start relay R140 interrupts, at the
contacts 152, the contacts 162, the wiper 103 and
contacts 144, a further point in the previously
engaged ?rst contact in the associated contact
traced holding circuit for energizing the winding
bank 104, C141 and the ?rst conductor in the
of the hold relay R150 and prepares, at the con
tacts 145, a point in a circuit, traced hereinafter,
cable 116 to the ?rst contact in the contact bank
802 of the rotary switch $800 in the ?rst selec
for energizing the ‘upper winding thereof. Fur
tor link 895. Also, the application of ground
ther, the start relay R140 interrupts, at the con 50 potential to the conductor C118 completes a cir
tacts 142, a point in the previously traced circuit
~cuit for initiating the operation of the ?rst
for energizing the winding of the test relay R130
selector link 005 in a manner more fully described
and completes, at the contacts 143, an obvious
hereinafter.
.
‘
path for applying battery potential by way of the
In the foregoing description it was assumed
resistor 119 to the conductor C133, and completes, 55 that the runway end RI had not been previously
at the contacts "I, an obvious path for applying
selected by either the second or‘third selector
ground potential to the conductor C110 for a pur
links when the corresponding digit 1 was dialed. '
' pose more fully described hereinafter.
Assuming now that when the digit 1 is dialed,
Shortly after the magnet M135 restores, the
the corresponding runway end RI has been pre
slave relay R100 restores to interrupt, at the con 60 viously selected by either the second or third
tacts 10I , a further point in the previously traced
circuit for energizing the winding of the test- ’
selector links, the previously traced
energizing the winding of the test
relay R130. Shortly after the previously traced
‘is not completed when the dial 30I
is returned
holding circuit for energizing the winding of the
to its normal position. - More particularly, in this
hold relay R150 is interrupted, this relay re 65 event,
when the dial 30I is returned to its nor
stores to interrupt, at the contacts 15I, a further
mal position to interrupt, at the contacts 1I6
point in the previously traced circuit for ener
thereof, the previously traced path for short
gizing the winding of the magnet M135, to inter
circuiting the winding of the test relay R130,.an
rupt, at the contacts 152, a point in the pre-v
viously traced original circuit for applying bat 70 alternative path for short-circuiting the winding
of the test relay R130 is completed. This alter
tery potential by way of the resistor 110 to the
conductor C133, to interrupt, at the contacts 153,
the previously mentioned path for applying
ground potential to the conductor C138, and to
winding of R130, the
complete-at the contacts 154, a circuit, traced 75_ contacts 142, C133, the contacts 16I, the wiper
18I and engaged ?rst contact, in the associated
'
2,296,936
contact bank of the rotary switch $180 to the
164, C738, the contacts ‘iii of the dial 30I, C156,
the contacts 120 of the key IKI, C139, the con
the last-mentioned conductor in the cable 116, I tacts 145 and 165 and the upper winding of
R140 to battery. When the upper winding of
having ground potential appearing thereon in
the start relay R140 is energized over the above
a manner more fully described hereinafter. Ac
traced circuit, the lower winding thereof being
cordingly, at this time, the test- relay R130 does
energized by way of the previously traced hold
' not operate. Hence, after the slave relay R190
ing circuit, the start relay R140 restores, this
and the-hold relay R150 restore, only the switch
relay being of the differential type.‘ Upon re-‘
ing relay R160 occupies its operated position.
In view of the fact that the start relay R140 is 10 storing, the start relay R140 interrupts, at the
contacts 145, the previously traced circuit for»
not operated to complete, at the contacts 1“, the
energizing the upper winding thereof and inter
previously mentioned path for applying ground
rupts, at the contacts 146, the previously traced
potential to the‘conductor C118, operation ofthe
holding circuit for energizing the lower winding
?rst selector link 895 is not initiated at this time.
thereof. ' Further, the start relay R140 com
In the foregoing description it was assumed
pletes, at the contacts 144,__ the previously traced
. that the ?rst digit dialed at the dial 3“ was the
circuitfor energizing the winding of the hold
digit 1. Assuming now that the ?rst digit dialed
relay R150, thereby to cause the latter relay to
is some other digit other than 1 and any digit
operate.
Also, the start relay R140 interrupts,
between 2 and 0, such, for example, as the digit 4,
at
the
contacts
143, the previously traced alter- 20
at the conclusion of the digit the ?nger disk
native circuit for applying battery potential by
882 of the dial 30! is returned to its normal posi
way of the resistor 119 to the conductor C133,
tioii, thereby to interrupt, at the contacts ‘M6,
prepares, at the contacts 142, the previously
the previously traced path for short-circuiting
traced
path for short-circuiting the winding of
the winding of the test relay R130. At this time
the test relay R130, and interrupts, at the con
the wipers noted of the rotary switch S180 en 25 tacts
"I, the previously mentioned path for ap
gage the fourth contacts in the associated con
plying
ground potential to the conductor C118.
tact banks and the previously traced circuit is
Upon
operating,
the hold relay R150 completes,
completed for energizing the winding of the test
at the contacts 15L the previously mentioned
relay R130 in the event the corresponding run
circuit for energizing intermittently the wind
way end R4 on the ?ying ?eld has not been pre 30 ing of the magnet M135 of the rotary switch
viously selected by either the second or the
S180 by way of the dial 30L
'
third selector links.. When thus energized, the
When the ?nger disk 302 of the dial 30l is
test relay R130 operates, as previously explained,
released, the dial 3!" operates‘to transmit a sec
thereby to cause the start relay R140 to operate,
ond series of impulses correspondingv to the sec
whereupon operation of the ?rst selector link 895
ond digit, thereby to cause the magnet M135 to
is initiated, as previously explained.
operate intermittently and drive the wipers noted
On the other hand, in the event‘the runway
of the rotary switch S180 a corresponding num
end R6 has been previously selected by either ' ber of additional steps in the clockwise direc
the second or third selector links, an alternative
tion. At the conclusion of the second digit the
path for short-circuiting the winding of the test 40 wipers noted of the rotary switch S180 engage
relay R130 is completed when the dial 38! is re
contacts in. the associated contact banks dis
turned to its normal position. Accordingly, op
posed one step in advance of the number of im
eration of the ?rst selector link 895 is not ini
pulses included in thesecond digit. At the con
tiated in this event, as previously explained.
clusion of the digit the ?nger disk 302 of the
In the foregoing descriptions it was assumed
dial 30l is'returned to its normal position, there
corresponding ?rst conductor in the cable 116, ,
that only one digit was dialed at the dial 30!.
Assuming now that two digits are to be dialed
at the dial 30 i, the ?rst digit comprising the
digit 1 and the second digit comprising any digit
by to interrupt, at the contacts 1I6, the previ
ously traced path for short-circuiting the wind
ing of the test relay R130. At this time the
wipersnoted of the rotary switch S180 engage
‘ between the digits 1 and 8, such, for example, 50 the third contacts in the associated contact
as the digit 2, a first digit 1 and a second digit
banks and the previously traced circuit is com
2 being dialed when it is desired to select the
pleted for energizing the winding of the test re
runway end RI2 on the ?ying ?eld. At the con
lay R130 in the event the corresponding run
clusion of the ?rst digit 1 the apparatus in the
way end RI2 on the ?ying ?eld has not been impulse receiver unit 100 occupies one of two
previously selected by either the second or third
conditions, depending upon whether the corre
selector links. ~
sponding runway RI on the ?ying ?eld has been
On the other hand, in the event the runway
previously selected by either the second or third
end-Rl2 has been previously selected by either
selector links, as previously explained.
the second or third selector links, an alternative l
Assuming that the runway end B1 on the ?y
circuit is completed for short-.circuiting the
ing ?eld has not been previously selected by 60 winding of the test relay R130, this circuit ex
either the second or third selector links when the
tending from ground byway of the contacts 19! ,
?rst digit 1 is dialed, the apparatus in the im
the winding of R130, the contacts 142, C133, the
pulse receiver unit 100 occupies the condition
, contacts 162, the wiper 183 andengaged' third
initially explained and the ?nger disk 302 of 65 contact in the associated contact bank 184 of
the dial 30l is again actuated in accordance with
the digit 2. In this event, when the ?nger disk
302 [of the dial. 30l is actuated away from its
the rotary switch S180 to the corresponding con~ '
normal position, the contacts 1" in .the dial
ner more fully described hereinafter.
ductor in the cable 111, this conductor having
ground potential appearing thereonhin a man
Accord- ‘
30| are actuated into engagement, thereby to 70 ingly, in this event, operation of the ?rst selec
tor link 895 is not initiated.
complete the previously mentioned circuit for‘
Assuming that the runway end RI on the ?ying
energizing the upper winding of the start relay
R140, this circuit extending from ground by way \ ?eld has been previously selected, when the digit
1 is dialed the apparatus in the impulse receiver
of the wiper 185 and engaged ?rst contact in the
associated contact bank 186, C149, the contacts 75 unit 100 occupies the condition explained above
10
2,296,936
and the ?nger disk 302 of the dial 30l is again
actuated in accordance with the digit 2. In this
event, when the ?nger disk 302 of the dial 30!‘
is actuated away from its normal position, the
contacts 111 of the dial 30l are actuated into
engagement, thereby to complete directly an al
ternative circuit for energizing the winding of the
hold relay R150. This alternative circuit for
~ to the contact bank 802 of the rotary switch
S800 in the ?rst selector link 885, in the event
the corresponding runway end on the ?ying ?eld
has been previously selected by the second or
third selector‘ links. Accordingly, the test relay
R130 in the impulse receiver unit 100 is not op
and engaged ?rst contact in the associated con
tact bank 186 of the rotary switch S180, C149,
the contacts 184, G138, the contacts 1" of the
erated in the event the determined runway end
on the ?ying ?eld has been previously selected
by either the second or third selector links.
10' Hence, the start relay R140 in the impulse re
ceiver unit .100 is not operated to initiate opera—
tion of the ?rst-selector link 895 in this event.
Further, it is noted that, in the event the de
dial 30!, C158, the contacts 120 of the key IKI,
C139, the contacts 144 and the winding of R150
selected by the second or third selector links, the
energizing the winding of the hold relay R150
extends from ground'by way of the wiper 185
to battery. When energized over the above
‘traced circuit, the hold relay R158 operates as
previously explained, thereby to render the mag
termined runway end has not been previously
operation of ‘the start relay R140 in the impulse
receiver unit 100 is effective not only to initiate
operation of the ?rst selector link 895, but to
mark with battery potential by way of the re
digit transmitted by the dial 38 I. The subsequent 20 sistor 119 and the previously traced circuit a par
ticular contact in the contact banks 182 or 184
operation of the impulse receiver unit 100 is the
of the rotary switch S180 corresponding to the
same as that previously explained, the operation '
determined runway end_on the ?ying ?eld. This
of the test relay R130 at the conclusion of the
marking of the contact in the contact banks 182
second digit 2 being dependent upon whether the
or 188 of the rotary switch S180 is e?ective to _
runway end R l 2 on the ?ying ?eld has been previ
control the operation of the ?rst selector link
ously selected by either the second or the third
885 in a manner more iully described hereinafter.
selector links, as previously noted.
Also, it is noted that the impulse receiver unit
From the foregoing description of the operation
100 is so connected and arranged that it is re
_ of the impulse receiver unit 100 it is noted that,
at the conclusion of any digit or digits dialed at 30 sponsive to a second digit after a ?rst digit has
been dialed only in the event the ?rst digit dialed
the dial 30I, the. previously traced circuit for
is the digit 1.
’
energizing the winding of the test relay R130 is
net M135 operative in response to the additional
completed only in the event the corresponding
runway end on the ?ying ?eld has not been previ
ously selected by either the second or third selector links. On the other hand, in the event the
corresponding runway end on the ?ying ?eld has
been previously selected by the second or third
selector links, the previously traced circuit for
energizing the winding of the rest relay R130 at
the conclusion of the digit is not completed in
view of the fact that an’ alternative circuit for
short-circuiting the winding of thetest relay R130
Continuing now with the operation of the ?rst
selector link 895 and assuming that the digits
1 and 2 have been dialed successively, the wipers
noted of the rotary switch S180 engage the third
contacts in the associated contact banks and the
start relay R140 and the switching relay R180 oc
cupy their operated positions. Accordingly, the
40 third contact in the contact bank~184 engaged by
thewiper 183 of the rotary switch S180 and corre
sponding to the twelfth contact in the contact
bank 802 of the rotary switch S180 is -marked
with battery potential, this marking path ex
is completed. As previously noted, this alterna
tive circuit extends from ground by way of the 45 tending from battery by way of the resistor 118,
the contacts 143, C133, the contacts 162, the
contacts‘ 19l, the winding of R130 and the con
wiper 183 and engaged third contact in‘ the asso
tacts 142 to the conductor C133, from the ‘con
ductor C133 by way of the contacts 16! to the _ ciated contact bank 184 of the rotary switch
S180 and the corresponding conductor in the
wiper 18l of the rotary switch S180, or from the
conductor C133 by way of the contacts 162 to 50 cable 111 to'the twelfth contact in the contact
the wiper 183 of the rotary switch S180, the wiper
181 of the rotary switch S180 engaging a- contact
in the associated contact bank 182 having ‘ground
potential appearing thereon in the event the digit
bank 802 of the rotary switch S800. Also, upon
operating, the start relay R140 completes, at the
' contacts 14l, the previously mentioned path for
applying ground potential to the conductor
C118, thereby to initiate operation of the ?rst
dialed comprises any digit between 1 and 0 and
the wiper 183 of the rotary switch S180 engaging
a contact in the associated contact bank 182 hav
selector link 895 as previously explained.
ing ground potential appearing thereon in the
event the digit dialed comprises any digit between
potential to the conductor C118 completes a cir
cuit for energizing the lower winding of the
More particularly, this application of ground
test relay R850 and a multiple circuit for ener
11 and 18. The ground potential appearing on
the contact in the contact bank 182 engaged by 60 giving the winding of the magnet M880 of the
rotary switch S800. The circuit for energizing
the wiper '18l of the rotary switch S180 isderived
the lower winding of the test relay R850 extends . '
by way of the corresponding conductor in the
from the grounded conductor C118 by way of the
cable 118 from a contact bank in either the second
contacts 843, the resistor 811 and the lower wind
or third selector linkscorresponding to the con
ing of R850 to battery; and the circuit for ener
tact bank 802 of the rotary switch S800 in the
gizing the winding of the magnet M880 extends
?rst selector link 895, in the event the corre
from the groundedconductor C118 by way of the
sponding runway end ‘on the ?ying ?eld has
contacts 844, 855 and 88| and the winding of
‘been previously selected by the second or third
selector links; and the ground potential appear 70 M880 to battery. When the lower winding of
the test relay R850 is thus energized, this relay
ing on‘the contact in the contact bank 184 en
becomes extremely fast to operate when the
upper winding thereof is energized. When the
winding of the magnet M880 is thus energized,
in the cable 111 from a .contact bank in either
the secondor third selector links corresponding 75 this magnet operates to interrupt, at the contacts
gaged by the wiper 183 of the rotary switch S180
is derived by way of the corresponding conductor
11
2,296,986
and prepares at the contacts 858, a circuit, traced
88I, the previously traced circuit forenergizing
hereinafter, for energizing the upper winding
of the switch-through relay R818.
Also, the test relay R858 completes, at the con
tacts 851, a path for applying ground potential to
the fourth contact in the contact bank 888 of the
the winding thereof, thereby to cause themag
net M888 to restore and recomplete, at the con
tacts 88I, the previously traced circuit for ener
gizing the winding thereof. Accordingly, the
magnet M888 operates intermittently, thereby
rotary switch S888, this path extending from
ground by way of the contacts 851, C888, the
wiper 884 and engaged twelfth contact in the as
to cause the wipers noted of the rotary switch
$888 to be driven step by step in the counter- l
clockwise direction until the wiper 88I engages
sociated contact bank 888 and C818 to the fourth
the twelfth contact in the associated contact 10 contact
in the contact bank 888 of the rotary
bank‘882 marked with battery potential as pre
switch S888. It is noted that ground potential
viously explained. When the wiper 88I engages
is applied to the fourth contact in the contact
the twelfth contact in the associated contact
bank 888 of the rotary switch $888 in view of the
bank. 882 of the rotary switch S888, the pre
fact that the runway end R4 on the ?ying field
15
viously mentioned circuit for energizing the
is opposed to the determined runway end RI2
upper winding of the test relay R858 is com
pleted, this circuit extending from ground by ' thereon. As previously noted, upon operating,
- the mar-king relay R888 applies ground potential
. way of the contacts 882, the upper winding of
to the ?fteen conductors included in the cable
R858, C884 and the wiper 88I to the twelfth con
tact in the associated contact bank 882, this con 20 888, which conductors are terminated by the con
tacts I to 8, inclusive, 5 to II, inclusive, and I4
tact having battery potential appearing thereon.
to I8, inclusive, in the contact bank 888 of the
When the upper winding of the test relay R858
rotary switch $888, the runway end R3 being an
is thus energized, this relay operates exceedingly
opposing runway end to the determined runway
end RI2 on the ?ying field and the runway ends
fast to interrupt, at the contacts 855, the pre
viously traced circuit for energizing the winding
.of the magnet M888, thereby to arrest further
operation of the rotary switch‘ 8888. Accord
ingly, at this time, the wipers noted of the rotary
switch S888 engage the twelfth contacts in the
associated contact banks. >
'
‘RI, R2, R5 to RII, inclusive, and RM to RIB,
inclusive, being intersecting runway ends with re
spect to the determined runway end-RIZ. Ac
cordingly, at this time, all of the contacts, with
30
Also, upon operating, the test relay R858, coma
the exception-“of the twelfth and thirteenth con- ,
tacts in the contact bank 888 of the rotary switch _
S888 are marked with ground potential due to
the fact that the runway end RI 2 is the deter—
,mined runway end and the runway end RI3 is
the only other runway end not con?icting with
winding thereof. Further, the test relay R858 35 the determined runway end RIZ. Further, it is '
completes, at the contacts 858, an obvious path
noted that the marked contacts in the contact
pletes, at the contacts 854, an obvious path for
short-circuiting the resistor 811, thereby to pro- vide a low resistance holding circuit for the lower
for applying direct ground potential to the con
banks 882 and 888 of the rotary switch $888 in
ductor C854, thereby to mark with ground po
the ?rst selector link 885 are multipled to corre
tential by way of vthe wiper 8M and engaged
sponding contacts in the contact banks of corre
40
twelfth contact in the associated contact bank
sponding rotary switches in the second and third
of the rotary switch $888 the corresponding con
selector links, thereby to prevent the second and '
ductor in the cable 111. This application of
third selector links from seizing trunks associated
marking ground potential to the twelfth con
with con?icting runway ends on the flying ?eld,
ductor in the cable 11‘! marks the corresponding
as will be explained more fully hereinafter.
runway end RI2 on the ?lying field against selec
Finally, upon operating, the test relay R858 I
tion by either the second or third selector links.
Also, upon operating, the test relay R858 inter
45
prepares, at the contacts 858, a circuit for ener
gizing the winding of the magnet M885 of the ro
rupts, at the contacts 852, the previously men
tary switch $828, which circuit is completed when
tioned path for short-circuiting the lower wind
the dispatcher in the dispatcher control tower
ing of the lockout relay R848,‘ thereby to render 50 I8I returns the key IKI~ of the ?rst selector link
the lockout relay R848 relatively fast to release
885 from its select position to its normal position.
when the key IKI is operated from its select
Before the dispatcher in the dispatcher control
position back to its normal position. Also, upon
tower >I8I returns the key -IKI from its select
operating, the test relay R858 prepares, at the ,_
' position to its normal position, he ?rst operates
contacts 85I, an alternative holding circuit, 55 the keys IK2 and IK3, the key IK2 being oper
traced hereinafter, for energizing the lower wind
ated in accordance with the use to be made of
ing thereof and completes, at the contacts 858, a
the determined runway end RI! and the key IK3
circuit for energizing the winding of the‘mark
being operatedin accordance .with the visual con
ing relay R888. The circuit for energizing the
dition of the ?ying field. In the event the ?ying
winding of the marking relay R888 vextends from
?eld is clearly visible and illumination of the
ground by way‘ of the contacts 858, the wiper 888
contact lamps disposed along the margins of the
and engaged twelfthcontact in the associated
runway R4,—RI2 ‘is not required, the key IK8 is
contact bank 884 of the rotary switch S888, and
operated to its tra?ic-on position. On the other
the winding of R888 to battery. when energized
' hand, in the event the ?ying ?eld'is not clearly
over the above-traced circuit, the marking relay
visible and illumination of the contact lamps dis
R888 operates to complete,v at'the contacts 88I,
posed along the margins of the runway R4-RI2 I
882, etc., obvious paths for applying ground po-. ' is required, the key IK8 is operated to its runway
tential by way of the grounded conductor C888
, and tra?lc on position.
v
to the ?fteen conductors included in the cable
Assuming that the ?ying ?eld is clearly visible
888, for a purpose more fully described herein 70 and that the determined runway RI! is‘ to be
‘after. Further, the test'relay R858 prepares, at
used by an airplane taking oil’, the key IK_8 is.
the contacts 858, a circuit, traced hereinafter,
operated to its tra?lc on position and the key I K!
for energizing the winding of the stop relay R888
is retained in its take off position. After the
'in multiple with the pilotklamp m m the first
keys
IE2 and IK8 have been thus operated, the.
group of pilot lamps on the indicator panel 288,
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