. Operation of trains and station work and telegraphy . lector re-mains closed until the operator answers the call by clos-ing a key. The arrangements are such that the dispatcherreceives an automatic answer-back signal from the sta-tion called. This signal is given by the bell at the station,so that if the answer back is received by the dispatcherthere can be no question as to the ringing of the bellat the station. The dispatcher is equipped with a chest transmitterand a head telephone. * The transmitter circuit is nor-mally open, and his receiver is bridged across the lineat all times. In th
. Operation of trains and station work and telegraphy . lector re-mains closed until the operator answers the call by clos-ing a key. The arrangements are such that the dispatcherreceives an automatic answer-back signal from the sta-tion called. This signal is given by the bell at the station,so that if the answer back is received by the dispatcherthere can be no question as to the ringing of the bellat the station. The dispatcher is equipped with a chest transmitterand a head telephone. * The transmitter circuit is nor-mally open, and his receiver is bridged across the lineat all times. In this way he can be reached simultane-ously by any operator coming in on the line. A key forclosing the transmitter circuit is provided and also oneto connect a howler signaling circuit to the line, this lat-ter being used when stations fails to disconnect their setsfrom the line after finishing their conversation. The stations are equipped with special telephone sets,consisting of a special desk arm, to which is secured a 604 TELEPHONES IN RAILROAD WORK. _ «
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadtrains, booky
