Millikan, Robert Andrews, Gale, Henry Gordon · Boston : Ginn and Co. · leaf 303
f many thousand turnsof fine wire, to secure therequisite number of am-pere turns (§ 309) to workthe armature. The clicksof such an armature arenot sufiiciently loud to beread easily by an operator.Hence at each station there is introduced a local circuit, which contains a local battery and asecond… … Fig. 268. The relay
Physics
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