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 67
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… … VOLTMETERS AND AMMETERS. 45 The pointer is then more readily located as to itsproximity to this disc when viewed from a distance. Sensibility. In the Weston direct current in-struments of the portable or the Type B form, aresistance of about 100 ohms per volt is added. In the other types of…
Electric testing · Electric apparatus and appliances
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