Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 814
d by means of a cocoon fibre. Thering, made of gun metal or brass, is about 15 inches in di-ameter. This instrument is also constructed as shown in fig. 501, so asto be equally suitable for measuring electro motive force and OBACH GALVANOMETER. 793 current strength. For this purpose it has a… … Fig. 501. as the current of one ampere with the solid ring. This simplerelation is very convenient for calibrating the galvanometer. The change of the constant, when the instrument is taken fromone place to another, is avoided by a compensating magnetplaced east or west from the needle and parallel…
Electrical engineering
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