. The Street railway journal . Fig. 6 the reader will note the various switchesmounted on the distribution board. Switch No. 8 is a single-pole double-throw knife switch, which throws the tunnel lightsupon either of the companys power stations. No. 9 is nor-mally closed, so that Edison current will be instantly availablein case the Elevated supply fails. No. 10 is an automatic switchwith two blades at right angles. It is fitted with a no-voltagerelease coil, which permits a powerful spring to throw the upper station by suitable snap switches and fuses. Several arc lightsare also installed at e
. The Street railway journal . Fig. 6 the reader will note the various switchesmounted on the distribution board. Switch No. 8 is a single-pole double-throw knife switch, which throws the tunnel lightsupon either of the companys power stations. No. 9 is nor-mally closed, so that Edison current will be instantly availablein case the Elevated supply fails. No. 10 is an automatic switchwith two blades at right angles. It is fitted with a no-voltagerelease coil, which permits a powerful spring to throw the upper station by suitable snap switches and fuses. Several arc lightsare also installed at each station, and wired independently ofthe other circuits, on the Edison three-wire system through theswitch-box shown in the diagram, thereby preventing the totaldarkness at stations which might otherwise result from theloss of the regular power supply. As will be seen from the diagram, the leads from switchesNo. 6 and No. 7 are No. 3 B. and S. cables carried in theunderground conduits of the tunnel, while the No. 8 B. and Street Ry. Journal FIG. 4.—DETAILS OF TROLLEY PROTECTION emergency trolley supply is run in two parallel lines throughoverhead pipes along the tunnel sides. At regular intervalsin the tunnel distribution, boxes are installed as shown, eachbox feeding six groups of five lamps each, through enclosedfuses and suitable circuit wires. On the north side of the tun-nel are eleven such boxes; on the south side there are lamps are fed from the same circuit. In each box isa single-pole double-throw knife switch for throwing the tun-nel incandescents in that section upon either trolley or regular
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
