Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 240
tchboard, the necessarycurrent being obtained from a subsidiarysource of supply, often a small set of ac-cumulators. A set of motor-operated oilswitches is shown on the Plate facing p.524. Two lamps are generally mounted onthe board, a red and a green, which areswitched on or off by the action of… … Hg. 3.—Bemote-contTolled Oil Switch solenoids, or by compressed air controlledby electrically-operated valves, and the ad-vantage of any of these methods of controlis that the oil-switch cells may be at a con-siderable distance from the operators panel.Eemote control, as it is called, is also…
Electrical engineering
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
