A dictionary of electrical words, terms and phrases (1896)
Houston, Edwin J. (Edwin James), 1847-1914 · New York, The W.J. Johnston company · leaf 526
bringing thecontact springs resting thereoninto different contacts. In the more modern form of single-needle in-strument, shown in Fig. 537, a single magneticneedle N S, Fig. 538, only is placed in thecoil. This needle is rigidly attached to a light needlea, b, used only as a pointer, and is alone… … Fig. 538. Needleand Pointer. Tel.] 515 [Tel,
Electricity · Electrical engineering
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