Dynamo-electricity: its generation, application, transmission, storage and measurement (1884)
Prescott, George B. (George Bartlett), 1830-1894 · New York, D. Appleton · leaf 395
Fig. 221. THE REGNARD ARC LAMP. This regulator has screw-shaped carbons, which move forwardor backward by the action of two female screws, which are setin motion by a spring controlled by an electro-magnet, similarin principle to that employed by Duboscq, described on page 8. 374 THE ELECTlilC…
Electrical engineering
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