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 95
he pointer or index does not touchthe scale. If the eye is not directly in front of the indexa reading to one side or the other is liable to bemade. il ELECTRICAL INSTRUMENTS. Where an index stands as much as a quarter ofan inch away from the scale, a large error in read-ing might result. This… … Fig. neath the index. The reading is made when bylooking down on index and mirror, the indexhides its own reflection. Some switchboard instruments are made foredgewise reading, that is, the scale is at right anglesto the base, Fig. 57. The scale is curved and theindex is bent so as to follow it.…
Electric testing · Electric apparatus and appliances
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