Dynamo electric machinery; its design, construction, and operation; direct-current machines (1915)
Sheldon, Samuel, 1862-1920, Hausmann, Erich, 1886- joint author · New York, D. Van Nostrand Company; · leaf 209
or current. At normal current thevalve is centrally placed, and the oil from the pump flowsaround the overlapping ports into the reservoir without GENERATORS. 197 effect. If the current rises above the normal, the armatureof the controlHng magnet is attracted, the balance valvemoves up, and oil… … Fig. iig. time a pinion on the shaft, seen in Fig. 119, actuates arocker arm which moves the brush holders to a positionsuch that the collection of current by the brushes will besparkless. When the current returns to its normal valuethe adjusting spring returns the lever and balance valve tothe…
Electric machinery
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer03inte-718-419.webp)
