. Operation of trains and station work and telegraphy . STATION WORK AND TELEGRAPHY 595 the relay completes the bell circuit, which is entirely in-dependent of the line. The bell used in this circuit is ofthe vibrating type, is provided with a four-inch gongand has sufficient power to be heard for a long distance.(Fig. 18.). Fig. 18. Example.—The dispatcher desires to speak with theagent at way station No. 71. He first operates key and then presses the starting key which releases allthe clock movements in the system, and as the brushpasses over contact No. 7 on the dial at the dispatchers
. Operation of trains and station work and telegraphy . STATION WORK AND TELEGRAPHY 595 the relay completes the bell circuit, which is entirely in-dependent of the line. The bell used in this circuit is ofthe vibrating type, is provided with a four-inch gongand has sufficient power to be heard for a long distance.(Fig. 18.). Fig. 18. Example.—The dispatcher desires to speak with theagent at way station No. 71. He first operates key and then presses the starting key which releases allthe clock movements in the system, and as the brushpasses over contact No. 7 on the dial at the dispatchersoffice, the selector at station No. 7 has caused its com-mutator to revolve so that the contact point has comeunder the brush; thus the two selectors together completethe necessary circuits at the same instant and conse- 596 TELEPHONES IN RAILROAD WORK quently the relay is operated, cutting the bell into will continue to ring until the attendant the dispatcher want a group or even all the sta-tion agents on the line at one time he operates such sta-tion keys as he desires, presses the starting button andeach bell starts to ring in turn as the selector brush passesover the different contact points on the dial. dispatchers office equipment. The equipment for the dispatchers station consist
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadtrains, booky
