Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 305
ELECTRIC BELL AND TELEGRAPH 261 (Fig. 269, A), which is so arranged that it clicks both when it is drawndown by its electromagnet against the stop S and when it is pushedup again by its spring, on breaking the current, against the stop t.The interval which elapses between these two clicks indicates…
Physics
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