Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 378
THE SIEMENS ARC LAMPS. 357 moved by means of the ]ower arm, A, which is set in action bythe electro-magnet, E. When the current passes through theelectro-magnet, E, and the carbons, C C, the rod, R, which ismade of a refractory substance, thrusts the carbons apart. Ifthe current should decrease in… … Fig. 208. means of the lever arm, which is terminated by an iron cylinder,which forms the movable core of the electro-magnet, E. Thiscarbon has to vibrate merely 82 times a second to cause theappearance of a steady light at the point, P. This lamp alsoadmits of many lights in the same circuit.…
Electrical engineering
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