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 192
Fig. 69. Westinghouse Unit Switch Cyl-inder and Magnet Valve Fig. 70. Details of Blow-Out Coils, West-inghouse Unit Switch allowed to enter at the bottom of the cylinder and it pushes thepiston upward, against the resistance of the coiled spring, and closesthe switch. When the exciting circuit is… … Fig. 71. Group of Unit Switches, Westinghouse System is cut off and the air in the cylinder is allowed to escape. The switchis theu opened by the spring. The arc is broken in a magnetic fieldproduced by a magnet the end of which is shown dotted in thefigure. Fig. 68 is a picture of the unit switch…
Electrical engineering
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