International Library of Technology · Scranton, International Textbook Co. · leaf 302
of Weston instruments used for switchboard work. Thevoltmeter V and ammeter M are mounted in iron cases, and the dial is ruledon opal glass, whichis illuminated frombehind by means ofincandescent lamps.The cheaper style, orround type, with-out illuminated dials,is shown by the am-meters «, a. The… … 17 ELECTRIC LlGHTINCx. 11
Electrical engineering
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