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 160
duced currents 140 HAWKINS ELECTRICITY Primary Induction Coils.--These represent the simplestform of coil, and are used chiefly in low tension ignition to in-tensify the spark when a battery forms the current source. A primary coil consists of a long iron core wound with a con-siderable length of… … Fig. 136.—Primary induction coil as used for low tension ignition. Coils of this type aremade in a great variety of form and size. Ordinarily the winding consists of about sixconvolutions of No. 14 copper wire. -The winding is usually covered and the ends cappedwith ebonite heads so that the core…
Electrical engineering
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