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 487
unted underneaththe floor upon which the switchboard stands.The rheostat is operated by means of sprocket-wheels and chainwhich are moved by a hand-wheel on the switchboard. SWITCHBOARDS Alternating-current switchboards difi^er from direct-currentswitchboards as follows: (a) On account of the many… … Fig. 363. Diagram Showing Switchboard Control for Large Rheostats 438 ALTERNATING-CURRENT MACHINERY 421 (b) Because of complications associated with the use of anauxiUary direct-current generator for exciting the field magnets ofalternators. (c) Because of the frequent use of extremely high…
Electrical engineering
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