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 58
e bat-tery would result. The Rymer Jones reversing key shown in Fig.22 makes a rubbing or wiping contact. The leversmoved by the hard rubber handles are equippedwith large contacts of platinum. RHEOSTATS, KEYS AND SHUNTS. 35 The contacts on which these levers work arealso faced with platinum. A… … Fig. 23. 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…
Electric testing · Electric apparatus and appliances
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