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- · New York, T. Audel · leaf 95
BEFOi?ELMHINe CLEAT … LMHSSWITCH IN PLACE Figs. 883 and 884.—Elevation and sectional view showing arrangement of switch outlet inconcealed knob and tube wiring. Fig. 885.—Arrangement of surface switch in concealed knob and tube wiring. For a surfacesnap switch outlet, an iron box is not necessary, but a i^ in. cleat…
Electrical engineering
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