The elements of dynamic electricity and magnetism (1903)
Atkinson, Philip. [from old catalog] · New York, D. Van Nostrand company · leaf 153
r wire, surrounds thecore, and has a limited rotary motion, on jewelled bear-ings, in the narrow space between the core and pole- 136 DYNAMIC ELECTRICITY AND MAGNETISM. pieces, which is just wide enough to allow rotation with-out contact. The terminals of the coil are connected above andbelow with… … I Fig. 54. pointer, attached to the frame, to zero of the scale onthe left. These springs are made of a special, non-magneticalloy, and are placed in opposition to neutralize theeffects of expansion and contraction under variations oftemperature. A resistance coil, mounted within the case,…
Electricity · Magnetism
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