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 218
Fig. 125. to bring the current to its normal value. If the current betoo weak, the spring which is attached to the electro-magnetarmature overpowers the magnetic attraction. The result-ing movement of the armature stops the rotation of thescrew and permits the rotation of the nut. This results ina… … Fig- 126. PROBLEMS. 207 brushes in the opposite direction. The stopping and start-ing of the nut and screw are accomplished through themedium of small triggers controlled by the armature ofthe series magnet. The triggers are fastened to the gearrotated from the main shaft by a belt, and they engage…
Electric machinery
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