Electricians' operating and testing manual; a hand book for men in charge of electrical apparatus, repair men, trouble men, lamp trimmers, and electricians generally (1916)
Horstmann, Henry Charles, Tousley, Victor Hugo, 1875- joint author · Chicago, F.J. Drake & co · leaf 297
able to have a double scalevoltmeter, which will also indicate the polarity, butthis is not essential. If no reading is obtained at acertain place, with the wires connected one way, theymay easily be reversed and the polarity noted on themap. In Figure 175 a common method of testing bonds… … Figure 175 the voltmeter in the diagram are permanently fast-ened to bridge the bond, and the other wire is movedback and forth on the adjoining rail until a spot isfound at which the voltmeter gives no indication whilecurrent is flowing. The resistance of the bond is nowequal to the resistance of…
Electrical engineering · Electric testing
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