International Library of Technology · Scranton, International Textbook Co. · leaf 302
oil by means of the spiral springs s, s, which also serveto counterbalance the movement of the coil. When a cur-rent flows through the coil, it reacts on the magnetic field,and causes it to swing around like the armature of an elec-tric motor. It is evident that if an alternating current were 10… … 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…
Electrical engineering
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