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. . oroughly understood the student willbe able to trace out the circuits if he needs to do so in his practicalwork. For those who wish practice in tracing out the circuits inconnection with these studies a very recent diagram is given in theappendix Part IV, page 282. 163 68 ELECTRIC RAILWAY
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. . oroughly understood the student willbe able to trace out the circuits if he needs to do so in his practicalwork. For those who wish practice in tracing out the circuits inconnection with these studies a very recent diagram is given in theappendix Part IV, page 282. 163 68 ELECTRIC RAILWAYS Westinghouse Unit Switch Control The Westinghouse Company has developed a system of mul-tiple-unit control which is, in many ways, similar to the Sprague-General Electric system. An essential difference is that the energy foroperating the unit switches is supplied by means of compressed air in-stead of the electric current. This involves many differences in compressed air is controlled by electro-pneumatic valves,current for these being supplied through a train line as in the previouscase. The essential parts of the system may be summarized asfollows: (1) A group of unit switches or circuit breakers operated (throughelectro-pneumatic valves) by compressed air, which in turn is operated by. Fig. 67. Cross-Section of Westinghouse UnitSwitch Fig. 68. View of Westinghouse UnitSwitch means of a multiple-wire control circuit (as in the Sprague-General Electriccontrol). (2) A train line and set of control circuits, with a master controllerby means of which the operating coils of the electro-pneumatic valves areenergized in the proper combinations by current drawn from the third-railshoes. (3) A piping and reservoir system by means of which the unit switchesand reservoir are operated. The remaining parts are not essentially different from thoseof the other system. 164 ELECTRIC RAILWAYS 69 Unit Switch. The unit switch is shown in cross-section inFig. 67. Compressed air ente
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