Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 532
s to bring the index handwhich is attached to its axis, to zero point on the scale, when THE WESTON AEC LAMP. 511 the current is at its normal strength. Should the current exceedor fall below this strength, however, either the magnet or thespring preponderates, as the case may be, and the index is… … Fig. 312. by making contact with a stop screw in the upper part of the box,and sets an electric bell ringing to call the attention of the at-tendant. By means of this indicator, the attendant at the centralstation can see, upon starting the machine, that the normal cur-rent is going out to the…
Electrical engineering
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