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PREFACE TO THE SECOND EDITION.
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SINCE the issue of the first edition, in 1911, OUT knowledge of
transients has greatly increased, and many of the phenomena,
especially those of double energy transients and compound cir- cuits, have been observed and studied on transmission systems to a considerable extent, and have corroborated the oscillographic records given in the previous edition,
Considerable work has been done on momentary short circuits
of alternators, and the variable component of the self-inductive reactance recognised as a transient reactance resulting from the mutual induction of the armature with the field circuit.
Especially in the field of sustained or continual, and of cumu-
lative oscillations, a large amoxmt of information has been gathered. The practical importance of these* continual and cumulative oscil- lations has been strongly impressed upon operating and designing engineers in recent years, usually in the most disagreeable manner by the destruction of high power, high voltage transformers, A chapter on these phenomena lias therefore VKKJIX added in the second edition,
CHARLES P. STEINMETZ, A.M., PH.D.
February,
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