. Operation of trains and station work and telegraphy . y, and contact isestablished with the segments by means of a revolvingbrush. The motion of this brush is controlled in thesame manner as the commutators at the stations and dur-ing a half revolution it makes contact consecutively witheach of the 30 segments on the commutator, and thencomes to rest and is ready for the next call. Each of the thirty segments on the commutator of the 610 TELEPHONES IN RAILROAD WORK master clock is connected to one contact of an individualkey, the other contact of the key being connected to thewinding of a lo
. Operation of trains and station work and telegraphy . y, and contact isestablished with the segments by means of a revolvingbrush. The motion of this brush is controlled in thesame manner as the commutators at the stations and dur-ing a half revolution it makes contact consecutively witheach of the 30 segments on the commutator, and thencomes to rest and is ready for the next call. Each of the thirty segments on the commutator of the 610 TELEPHONES IN RAILROAD WORK master clock is connected to one contact of an individualkey, the other contact of the key being connected to thewinding of a local relay, its circuit being completedthrough the brush of the master clock. When operated,this relay sends an electrical impulse out over the tele-phone line. From this it will be seen that thirty individual keysare provided, one for each station. These keys, whendepressed, are mechanically locked, and are arranged sothat when the master clock comes to rest after makinga call, all of the keys which have been locked are releasedand restored to Train Despatchers Automatic Sending Device—Capacity 32 Stations-Equipped for 25, 7 blanks. Fig. 25. The dispatcher is also furnished with a starting key,which, when depressed, sends an impulse of current outover the telephone line, and starts the master clock andall of the station clocks, which continue to run for 30seconds, being then stopped mechanically, as previouslymentioned. To signal or select a station, the dispatcher depressesthe individual key associated with the particular station STATION WORK AND TELEGRAPHY 611 desired, and then starts the clocks by pressing the start-ing key. As the brush on the master clock passes overthe segments on the commutator, and when in contactwith the one connected to the station key which has beendepressed, it completes the circuit of the local relay, send-ing a second impulse of current out over the line. Atthe instant this second impulse of current is applied tothe line, the brush and
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroa, bookyear1919
