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 109
s on the battery.This cuts in one cell; if more are desired the cupsare connected to include them in circuit. The commutator plugs connect A x and B R asshown. Plugs G a and B a are inserted. Plug Vis omitted, galvanometer switch is turned to in 85 86 ELECTRICAL INSTRUMENTS. and shunt switch put on… … Fig. GO. cut in circuit to equal what the resistance beingmeasured amounts to. (When no idea is had ofthe latter, the galvanometer key must be tappedcarefully that no undue deflection injures gal-vanometer) . Depress battery key and tap galvanometer key. PORTABLE TESTING SETS. 87 If needle swings…
Electric testing · Electric apparatus and appliances
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