International Library of Technology · Scranton, International Textbook Co. · leaf 294
llowing the title page. 2 ELECTRIC LIGHTING. 17 construction. For ordinary work, where the pressure doesnot exceed 200 or 300 volts, plain knife switches are used.Fig. 1 shows a typical two-pole knife switch. Most of theseswitches are mounted directly on the slate or marble ofwhich the switchboard…
Electrical engineering
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