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 66
uments the data of resist-ance, etc., will be found printed on the inside ofthe lid. Care should be taken not to interchange VOLTMETERS AND AMMETERS, 43 the case lids, each instrument bears a serial num-ber. The laboratory type, Fig. 31, has a very largescale of peculiar design, Fig. 32, which… … Fig. 30. Figs. 35 and 36 show forms which have trans-parent dials illuminated from behind. Instruments of this pattern are often mountedon a swinging arm that they may be read fromvarious parts of the room. A black disc controlled by a button in the middleof the case front, is set to a determined…
Electric testing · Electric apparatus and appliances
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