. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . omake that device useless for throwing off the power. Some-times a controller becomes grounded or short-circuited, andthe consequent flow of current through it is so great that thecontroller cannot break it; again, sometimes the troublewith the controller or some other device is such that it isvery convenient to put the controller on the first or secondnotch and to start, run, and stop the car by means of thecanopy switch. This switch is also used to entirely cutthe wiring and all th
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . omake that device useless for throwing off the power. Some-times a controller becomes grounded or short-circuited, andthe consequent flow of current through it is so great that thecontroller cannot break it; again, sometimes the troublewith the controller or some other device is such that it isvery convenient to put the controller on the first or secondnotch and to start, run, and stop the car by means of thecanopy switch. This switch is also used to entirely cutthe wiring and all the devices out of communication withthe trolley wire when it is desired to inspect or work on anyof the controlling devices. A motorman should never try toadjust a controller finger or to replace a broken motor brushwithout first throwing the canopy switch handle to the off-position. 11. Westiugliotise Canopy Switch.—Fig. 13 shows thegeneral appearance of the Westinghouse switch. The switchfixtures are mounted on a wooden base and over the wholeis fitted the iron cover provided with four legs, by means of. Fig. 13. which the switch can be fastened to a wooden baseboardscrewed to the under side of the bonnet. The iron covercan be taken off by taking out the three screws a, a, a,exposing the inside to view. These switches are sometimescalled upon to break currents from 200 to 300 amperes, and 25 ELi:CTRIC RAILWAYS. 11
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectri, bookyear1901
