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 161
that makes it ofgreat value for most purposes is that the voltage oj the induced INDUCTION COILS 141 currents may be increased or diminished to any extent dependingon the relation between the number of turns in the primary andsecondary winding. This relation may be expressed in the following rule:… … FlG. 137.—Production of spark with plain coil. Connect the ends or leads of the secondarywinding to fixed insulators and bend the ends so they are from one-sixteenth to one-eighthinch apart. Connect one end of the primary winding to an electrk battery, and with theother lead of the primary winding…
Electrical engineering
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