International Library of Technology · Scranton, International Textbook Co. · leaf 155
n the primary coil. ELECTRICITY AND MAGNETISM. 1589 2455. An induction-coil is an apparatus devised onthe principle of mutual induction for producing pulsatingcurrents of electricity of high electromotive force. Induc-tion-coils are sometimes called Ruhmkorff coils, from thename of a celebrated… … ^B Fig. 9 turns of fine insulated wire, while the primary coil P con-tains only a few turns of thick insulated wire. The primarycircuit is automatically opened and closed at a and i, in thefollowing manner: t represents a spring which tends tokeep the circuit closed between the armature a and…
Electrical engineering
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