Electrical instruments and testing; how to use the voltmeter, ohmmeter, ammeter, potentiometer, galvanometer, the Wheatstone bridge, and standard portable testing sets (1907)
Schneider, Norman H. (Norman Hugh), Hargrave, Jesse · New York, Spon & Chamberlain; [etc., etc.] · leaf 59
Commutator. A form of reversing switch orcommutator is shown in Fig. 23. By changingthe plugs into different holes, circuits connected tothe commutator may be reversed, put to earth, orshort circuited. 36 ELECTRICAL INSTRUMENTS. The brass pieces are mounted on hard rubberpillars to increase the… … Fig. l>J. There are three binding posts, one connected to a movable lever operated by a button, one to acontact underneath this lever, and one to a contactover this lever. When the lever is up, it presses against the uppercontact completing a circuit connected to thelever binding post and top…
Electric testing · Electric apparatus and appliances
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