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 212
es from flying out. 183 174 DIRECT-CURRENT DYNAMOS Wedges. In the cases where wedges are driven into grooves inthe teeth, to close up the slot, the usual material employed is awell-baked hardwood, such as hornbeam or hard white vulcanized fiber. A modern method consists in usinga springy strip of…
Electrical engineering
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