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 121
Fig. 66. peculiar pattern with a telephone receiver as wellas a galvanometer. The adjustable rheostat takes the form of a finewire, under which are marked resistances in vari-ous colors. A stylus 5 is connected to the telephone T asshown in Figs. 67 and 68 and can be touched at 98 ELECTRICAL… … Fig. 07. In operation the resistance to be measured isconnected to posts A and D. The telephone isheld to the ear and the battery key on the tele-phone is closed. The stylus is tapped at variouspoints on the rheostat wire until no sound is heard
Electric testing · Electric apparatus and appliances
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