Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 822
c-ond, that by giving any special set to the spring (for doing which WHEEL AND PINION AMMETER AND VOLTMETER. 801 there is a small hand seen in the figure, and which can be turnedthrough any angle, indicated by a small graduated scale, A,under it), the needle does not start from the zero position… … AYRTON AND PERRYs WHEEL AND PINION AMMETER AND VOLTMETER. When still greater delicacy is required, the form of the springinstrument is somewhat changed, as shown in fig. 508. Attachedto the arbor of the needle is a wheel, W, with extremely fine€ut teeth gearing into those of a pinion, P, on the…
Electrical engineering
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