Cyclopedia of applied electricity : a general reference work on direct-current generators and motors, storage batteries, electrochemistry, welding, electric wiring, meters, electric lighting, electric railways, power stations, switchboards, power transmission, alternating-current machinery, telegraphy, etc. (1916)
American Technical Society · Chicago : American Technical Society · leaf 401
ovided with duplicate carbon brushes, and require prac-tically no attention in operation as they are so designed that allsurfaces of the rings haveeasy access to the air, thusinsuring good ventilation(see Fig. 147). The brushholders are supported by acast-iron standard, or yoke,from which they are…
Electrical engineering
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