. Operation of trains and station work and telegraphy . o flow out on the line during the interval of time inwhich the brush is passing over such points. (Fig. 15.) The selector keys are arranged in a row in front of thedispatcher, one key being required for each station. Be-low this row of keys are two other keys, one for start-ing the clock movements and one for releasing any se-lector key. This last mentioned key is for the con-venience of the dispatcher in releasing any selector keyhe has operated by mistake and is used only for this pur-pose, as all keys are automatically released after t
. Operation of trains and station work and telegraphy . o flow out on the line during the interval of time inwhich the brush is passing over such points. (Fig. 15.) The selector keys are arranged in a row in front of thedispatcher, one key being required for each station. Be-low this row of keys are two other keys, one for start-ing the clock movements and one for releasing any se-lector key. This last mentioned key is for the con-venience of the dispatcher in releasing any selector keyhe has operated by mistake and is used only for this pur-pose, as all keys are automatically released after theparty has been called. The arrangement of the keys isshown in the accompanying illustration. (Fig. 14.) 592 TELEPHONES IN RAILROAD WORK ^. / . ba STATION WORK AND TELEGRAPHY 593 The clock mechanism at each way station is equippedwith a small commutator having two contacts locateddiametrically opposite for the twenty-eight station system,while one contact only is required for the fifty-six stationsystem. This commutator revolves as the second hand of. Fig. 16. a clock and as it brings the contact point under the brusha circuit is completed through a relay, provided the dis-patcher has operated the key associated with this par-ticular station. This relay is so wired that when onceenergized it remains in the operated position until re-leased by the station agent in charge. The operation of 594 TELEPHONES IN RAILROAD WORK
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadtrains, booky
