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sqj.1933.0073

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Students' Quarterly Journal
September 1933
how many readers realize the diversity of applications of electric heat?
Mr. Stansel's work is, so far as the writer is aware, the only book published
on this branch of electrical engineering, and it presents in a most interesting way the different types of electric furnace and their applications.
A treatment of the subject is somewhat academic, being a presentation
of facts resulting from a scientific investigation of commercial processes.
The theoretical considerations are often left unsupported, although the
completed furnace is well illustrated and operating data are given. The
references are mainly American, which is a slight hindrance, although
some German and English references are included.
Specialized types are omitted, but the book contains much information
on subjects allied to the main topic, such as alloy characteristics, disassociation of gases at high temperatures, and hydrogen-copper brazing.
A supplement discusses electric heating in manufacturing processes as
compared with combustion methods.
A student interested in the subject would" be well advised to read
Mr. Stansel's work, even if he cannot add it to his library.
J. H. M.
Television for the Amateur Constructor. By H. J. Barton Chappie,
B.Sc, A.M.I.E.E.
(Pitman. 12s. 6d.)
Regular readers of the monthly magazine, Television, will recognize
much of the matter in this book, which is primarily for constructors who
are new to the mysteries of television. The Baird system only is dealt with.
The early chapters introduce the theory of the subject in a manner
requiring a minimum of wireless knowledge. The importance of good
reproduction is stressed and the effects of lack of certain frequencies are
clearly shown by photographs of television images. Suitable circuits are
illustrated in a chapter to themselves, while the final portion of the book
deals with the actual construction work of television receivers, additional
amplifiers for broadcast receivers, disc apparatus, and lastly the up-to-date
mirror drum scanner.
The many drawings, diagrams, and photographs are very clear and easy
to work from. Figs. 27, 28, and 44, however, show S.G. valves instead of
pentodes in the last stage, while there are one or two other typographical
errors of minor importance.
S. G.
Advanced Electrical Measurements. By W. R. Smythe, Ph.D., and
W. C. Michels, Ph.D.
(Chapman & Hall. 15s.)
The importance of accurate measurement has not been over-stressed
and no excuse is required for the appearance of another book on the subject.
The authors are engaged in teaching in the U.S.A. and, as they point
out in the Preface, the book is the outgrowth of laboratory instruction.
It is concerned not only with the measurement of electrical quantities,
but also with the determination of other quantities by electrical means.
Whilst some mathematics are practically inseparable from this subject,
a mean seems to have been struck between a too mathematical and an
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