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 57
, if B only is pressed downthe current to G is reversed because B is nowconnected to the negative terminal of the batteryand A to the positive. This key should not be so connected that the 34 ELECTRICAL INSTRUMENTS. platinum contacts form part of a circuit, the re-sistance of which is being… … Fig. 22. at the end of A and B, a short circuit of the 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…
Electric testing · Electric apparatus and appliances
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