Elementary treatise on electricity and magnetism : (1905)
Foster, G. C. (George Carey), 1835-1919, Joubert, J. (Jules François), 1834-1910, Porter, Alfred W. (Alfred William), 1863-1939 · London ; New York ; Bombay : Longmans, Green, and Co. · leaf 466
If the current passes in opposite directions inthe two coils, the effects are obviously concordant.362. Damping.—When a current corre-sponding to a permanent deflection a is startedin a galvanometer, the needle receives an im-pulse which, neglecting passive resistances, wouldcause it to pass beyond… … Fig. 307. 362] LOGARITHMIC DECREMENT 443 The oscillations may at once be reduced to a very small ampli-tude if the current is broken after a time equal to one-third of theperiod of a single swing of the needle. From the laws of simpleharmonic motion, the needle will in this time have traversed the…
Electricity · Magnetism
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