close

Вход

Забыли?

вход по аккаунту

?

sqj.1934.0033

код для вставкиСкачать
Students' Quarterly Journal
June 1934
• and the book concludes with an interesting chapter on the Generation and
Peculiarities of Ultra-Short Waves, ami useful appendices dealing with
Load Characteristics and Losses in Feeders.
H. T. G.
Calculation and Design of Electrical Apparatus. By \V. Wilson,
M.Sc, B.E., M.I.E.E., M.Amer.I.E.E.
(Pitman. 10s. Cd. Pp. 214.)
This is a lucid treatment of the principles upon which the design of
switchgear is based, and throughout the work the student's viewpoint
is fully considered. The opening chapters deal with fundamental calculations of a simple nature, the heating effect of an electric current applied
to fuses, busbars, and insulation, and close with a useful treatise on
electromagnetic forces with reference to switch blades and busbars.
Resistances for regulators, instruments, and motor starters are considered next, followed by a chapter dealing with system short-circuit kVA
capacities and the rating of oil circuit breakers. The design of electromagnets, solenoids, and coils is dealt with in a practical manner, leaving
no doubt in the reader's mind as to the correct method of procedure.
Calculations of busbars and heavy conductors, with reference to skin
and proximity effects and resultant temperature rise, precede a chapter
dealing with overhead lines, cables, condenser bushings, and choke coils.
The last chapter should be found useful to all students as it contains
the principles of vectors and vector algebra, symmetrical components, and
their application to determine the distribution of current in networks
under fault conditions.
A list of references to current literature is given at the end of each
chapter, whilst another commendable feature of the book is the complete
set of tables of relevant data. This book will prove an invaluable acquisition to the student's library.
D. D. MACF.
Training in Foremanship and Management. By James J. Gillespie,
(Pitman. 7s. 6d. Pp. 163.)
This book is a good outline of the fundamental knowledge j.ci±uired by
any man who hopes to achieve or has already attained a position in control
of manufacture.
The first part comprises a survey of works organization, with chapters
devoted to the various functional activities, such as planning, progressing,
time-study, wage payment, and costing. One particularly good chapter
describes how to analyse factory efficiency.
The unusual merit of the book, however, lies in the second part, under
the heading " Management Theory." Management, as those who have
studied and experienced it will testify, consists not in a huge store of
detailed knowledge, but in an intelligent, reasoned, decisive approach and
solution to problems and duties. The development of managerial ability
is, therefore, largely a matter of personal development. This fact is
being increasingly recognized. Mr. Gillespie's book, with its special
chapters on personal psychology and the development of executive ability,
and social psychology and the control of labour, is not only informative
but stimulating.
— 193 —
New Books for the Student
Many of the chapters are perforce brief by reason of the extent of the
subject. Some of the methods advocated, such as the rating by the
observer of an operator being time-studied, are open to question. However,
the book is likely to cause the reader to follow up his doubting by further
study of the references cited and reflection about the statements under
suspicion. This is the best way, apart from actual experience in management, to cultivate executive ability.
J. R.
Modern Polyphase Induction Motors. By Franklin Punga and
Otto Raydt. Translated from the German by Henry M. Hobart,
M.Inst.C.E.
(Pitman. 21s. Pp. 289.)
This is a specialist work which will not interest the average student,
as it assumes a thorough knowledge of the design of standard slip-ring
and squirrel-cage induction motors. On the other hand, designers and
post-graduate students interested in motor design will find it invaluable.
The authors deal with the various methods of improving the starting
characteristics of the cage type of induction motor, special consideration
being given to the double-cage rotor and motors with wound rotors. A
very useful chapter on centrifugal pulleys and clutches is included. The
regulations of various countries governing the starting of motors are
detailed briefly, and the appendix gives some very useful information on
slot combinations.
The translation is good, but the table of symbols needs careful study
before reading the book.
D. A. A.
Photo-Ceils and Their Application. (2nd Edition.) By V. K. Zworykin,
E.E., Ph.D., and E. D. Wilson, Ph.D.
(John Wiley & Sons. 18s. 6d. Pp. 321.)
This is an excellent book for the student, and one to be recommended
to those interested in the subject, notwithstanding its rather high price.
The subject-matter is not confined to the photo-cell, the three types
of which (true photo-electric cells, photo-conductive cells, and photovoltaic cells) are dealt with quite adequately, but the reader is introduced
to other developments in the field of electronics, and is given an inkling
of the various problems that are encountered in the design and use of
thermionic amplifiers.
Chapter XI compares the main types of photo-cell, and the fairness
of the methods employed is a tribute to the broadmindedness of the
authors, as it is apparent from the general tenor of the work that they
have a special affection for the electron-emission type.
The Appendix is devoted in part to tables of atomic and electronic
constants, and in part to clarifying the, to us, somewhat obscure nomenclature employed in applied optics.
F. J. S.
_
in
A
Документ
Категория
Без категории
Просмотров
2
Размер файла
117 Кб
Теги
0033, 1934, sqj
1/--страниц
Пожаловаться на содержимое документа