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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1917 Excerpt: ... about. Or, if a motor switch is closed, a period of acceleration intervenes before the flow of current becomes stationary, etc. The characteristic of transients therefore is, as implied in the term, that they are of limited, usually very short duration, intervening between two periods of stationary conditions. Considerable theoretical work has been done, more or less systematically, on transients, and a great mass of information is thus available in the literature. These transients are more extensively treated in Theory and Calculation of Transient Electric Phenomena and Oscillations, and in Electric Discharges, Waves and Impulses, and therefore will be omitted in the following. However, to some extent, the transients of our theoretical literature, still are those of the phantom circuit, that is, a circuit in which the constants r, L, C, g, are assumed as constant. The effect of the variation of constants, as found more or less in actual circuits: the change of L with the current in circuits containing iron; the change of C and g with the voltage (corona, etc.); the change of r and g with the frequency, etc., has been studied to a limited extent only, and in specific cases. In the application of the theory of transients to actual electric circuits, considerable judgment thus is often necessary to allow and correct for these secondary phenomena which are not included in the theoretical equations. Especially deficient is our knowledge of the conditions under which the attenuation constant of the transient becomes zero or negative, and the transient thereby becomes permanent, or becomes a cumulative surge, and the phenomenon thereby one of unstable equilibrium. II. Unstable Electrical Equilibrium 83. If the effe...

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