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 168
ees Fahrenheit as of unit resist-ance, at 60 degrees it would be less than one-half,at 75 degrees only one-fifth, and at 90 degreesonly one-twelfth. With other insulations the de-crease of resistance may be even greater than this.It is customary to test cables at 75 degrees Fahren-heit or to… … i fl Fig. 83. Telephone Test of Insulation. A simple test ofcable insulation may be made with a telephonereceiver and battery as in Fig. S3. One wire makes good connection with the cablearmor or lead covering the other wire being touchedto the cable core. Upon making the first contact with the core…
Electric testing · Electric apparatus and appliances
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