INDUCTION COIL THEORY AND APPLICATIONS BY E. TAYLOR JpNES, D. Sc.
PROFESSOR OP NATURAL PHILOSOPHY IN THE UNIVERSITY OF GLASGOW LONDON
SIR ISAAC PITMAN SONS, LTD. 1932 SIR ISAAC PITMAN SONS, LTD. PARKER
STREET, KINGSWAY, LONDON, W. C. 2 THE PITMAN PRESS, BATH THE
RIALTO, COLLINS STREET, MELBOURNE 2 WEST 45TH STREET, NEW YORK SIR
ISAAC PITMAN SONS CANADA, LTD. 7O BOND STREET, TORONTO PRINTED IN
GREAT BRITAIN AT THE PITMAN PRESS, BATH PREFACE THE theory of the
action of an induction coil, or that of any other form of
oscillation transformer, is essentially a theory of the transient
electric currents set flowing at some sudden or very rapid change
jn the circumstances of one of a pair of coupled circuits. The
precis-manner of variation of the currents depends upon the method
by which they are started, but generally in inductive circuits it
takes the form of two superposed oscillations which gradually die
away while the system is adjusting itself to its new conditions. In
many cases the currents, besides varying with time, are also
variable along the wire owing to its distributed capacity a fact
which is too often overlooked, with the consequence that erroneous
state ments are sometimes made regarding fundamental matters, such
as, for example, the law of electromagnetic induction which is
discussed in Chapter I. The book contains a less detailed and more
descriptive account of the action of induction coils than that
given in the Theory of the Induction Coil published eleven years
ago. All the essential features of the theory are, however,
retained in the present account, and free use has been made of
portions of the earlier book where they appeared suitable for the
purposes of the presentone. As in the former book, oscillographic
records are used largely to illustrate the subject, and many new
examples are here collected, including some, in Chapter III, which
illustrate the relative merits of coils and transformers as
generators of high potentials. In using an induction coil or other
generator for some prac tical purpose, it is important to
understand the nature of the function which it has to perform. One
such duty, for which induction coils are in general use at the
present time, is that of producing ignition in motor-car engines,
and an account of this subject is accordingly given in Chapter
VIII, with a discussion of the relative effectiveness in ignition
of different types of induction coil spark. vi PREFACE The
induction coil has recently proved to be a very suitable generator
of cathode ray beams for the study of electron diffraction
phenomena, and a description of experiments by this method is given
in Chapter VI. At the present time much use is made of the
sustained oscillations of coupled circuits, especially those in
which the amplitude is kept constant by the action of a triode
valve. There is an important difference between such maintained
oscillations and the transient vibrations which follow a sudden
alteration of the circuit conditions. In the latter, both com
ponent vibrations are usually strongly in evidence together, but in
the oscillations maintained by a valve only one of the components
is usually present, and it is only in very special circumstances
that both oscillations can be maintained simul taneously. This
question is discussed in Chapter IX, in which the conditions for
the maintenance of one component, or the other, or of both
together, areexplained. The author wishes to thank the Editors of
the Philosophical Magazine, The Electrician, and the Journal of the
Rontgen Society, for their kind permission to use articles and
illustra tions which have been published in those journals. Much of
the experimental work described in the following pages was carried
out in the Physics Laboratory of the Uni versity College of North
Wales, Bangor, and in the Natural Philosophy Department of the
University of Glasgow...
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