. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . 44. Westinglioiise Plug S^viteli.—Fig. 49 shows theWestinghouse Companys three-way plug switch. ^ is adisk of hard rubber about ?>h inches in diameter and about1:^ inches thick. In it are three metal-lined holes Z, i, 2,each with a metal bottom. By means of posts not shownin the figure, one circuit is attached to the metal sheath-ing of hole 1 and the other to that of hole 2\ the trolleywire connects to the sheathing of hole T. B is a L) plugwith a rubber handle; holes i, 2, and T
. A textbook on electric lighting and railways. International correspondence schools, Scranton, Pa. v. 1-3, 5 . 44. Westinglioiise Plug S^viteli.—Fig. 49 shows theWestinghouse Companys three-way plug switch. ^ is adisk of hard rubber about ?>h inches in diameter and about1:^ inches thick. In it are three metal-lined holes Z, i, 2,each with a metal bottom. By means of posts not shownin the figure, one circuit is attached to the metal sheath-ing of hole 1 and the other to that of hole 2\ the trolleywire connects to the sheathing of hole T. B is a L) plugwith a rubber handle; holes i, 2, and T have no connectionwith one another until plug B is shoved into place; if B isput into the two left-hand holes, the current comes in on 25 ELECTRIC .37 wire 7ami ^o^soiit on wire /; if /- is piiL iiilo the two rii^lU-liand holes, the current i-oines in on wire 7, as bef<jre, ant^. goes out on wire 2. If plug B should get lost, a piece ofNo. 4 B. «& S. rubber-covered wire bent intcj a U will answer. COXXECTIONS FOR LAMPS. 45. Single Jjainp Circuit.—The lamps used for light-ing cars require from 100 to 110 volts across their terminals;hence, in order to operate these lamps on a 500-volt circuit, ■O—i ^ MoTci L L L L L they must be arranged so that there will always be five inseries between the trolley and ground. It is not practicable 38 ELECTRIC RAILWAYS. 25 to make lamps that will burn directly across 500 50 shows a single five-light lamp circuit with all the lampsinside of the car; in such a case, an oil -headlight or signlight must be used. The lamp circuit is tapped to the trolleyroof wire ahead of both hood switches, so that the opening ofeither of these switches will not put out the lamps. 5 is asingle-pole snap switch and F B the lamp fuse box. 4G. Fig. 51 is the wiring diagram for a double-circuitcar that has eight lamps inside, two
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectelectri, bookyear1901
