Principles and practice of electrical engineering (1914)
Gray, Alexander, 1882-1921 · New York [etc.] McGraw-Hill Book Company, inc. · leaf 149
justablespeed motors which have to be started and stopped frequently,because the various operations are performed readily by the move-ment of a single handle and take place in their proper order Thecontroller is entirely enclosed and can readily be made weather-proof, while contact with the live… … Fig. 145.—Developed diagram of machine Fig. 146.—Machine tool con-tool controller. troller. the copper contact segments a, 6, c, d and e are attached; theseare in electrical contact with the drum and therefore with oneanother. The drum carries also a brush contact m which slidesover stationary…
Electrical engineering
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