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 119
ii[tip_i|py CONTACT6REAKER LEVER :0NTACTS INSULATEDCONTACT POST … Fig. 3,057.—Elementary repeater showing the insulated parts essential for the contact maker,and path of the current through the repeater portion of the instrument. The insulatedstop on the upper arm of the contact post is shown in sectional view to clearly indicate theinsulation at this point.…
Electrical engineering
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