Hawkins electrical guide ... : questions, answers & illustrations : a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications ; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833-1928 · New York : T. Audel & Co. · leaf 216
iththe American Marconi Co. It consists of two inductance tuning coils, like the one shown infig. 3,165, each composed of a layer of fine, insulated wire wound oncores of seasoned wood, over which contact sliders, like that shown infig. 3,155, rub on a portion of bared wire from which the… … PlG. 3,155.—Ball bearing slider for use on tuning coils, potentiometer or any device requiringa slider. In construction, the ball is contained in a round tube fastened to the squareslide tube brass bars on which the sliders move are each connected to the bindingposts marked A, B, and C…
Electrical engineering
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