Electricians' operating and testing manual; (1910)
Horstmann, Henry C. [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. H. Drake & co · leaf 250
y in the laboratory or testingroom. AYhere 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 shown at the top of the in-strument in the illustration. The current being meas-ured passes down through this suspension wire,through the wTire 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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