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 254
ly in the laboratory or testingroom. Where it is desired to measure very small currents,as where very high resistances are to be measured, a 248 Operating and Testing galvanometer more sensitive than the tangent galva-nometer must be used. The mirror galvanometer isoften used for this purpose.… … Figure 153 by a wire from the screw sho\^Ti at the top of the in-strument in the illustration. The current being meas-ured passes down through this suspension wire,through the wire of the coil and out by means of aspiral spring which is connected to the lower end ofthe coil. A very light mirror…
Electrical engineering · Electric testing
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