. Operation of trains and station work and telegraphy . Fig. 5. point in its lever (connected by a fine wire runningthrough the base to one local binding post) is perpendicu-larly arranged to work freely by the action of the electriccurrent produced in the magnets, which strikes againsta platinum point arranged in the adjusting screw, inthe yoke or frame (which is also connected by a finewire running to the other local binding post) whichcloses the local circuit through the sounder, which alsohas its connection with the local binding posts and thebattery. One other adjusting screw in the yoke
. Operation of trains and station work and telegraphy . Fig. 5. point in its lever (connected by a fine wire runningthrough the base to one local binding post) is perpendicu-larly arranged to work freely by the action of the electriccurrent produced in the magnets, which strikes againsta platinum point arranged in the adjusting screw, inthe yoke or frame (which is also connected by a finewire running to the other local binding post) whichcloses the local circuit through the sounder, which alsohas its connection with the local binding posts and thebattery. One other adjusting screw in the yoke or 28 TELEGRAPHY frame with an insulated point, governs the play of thelevers from the magnets. An adjusting spring is at-tached to the armature and its purpose is to draw thelever away from the magnets when the magnets Fig. 6. THE SOUNDER. The chief use of the sounder is to aid the receivingoperator. It consists of an electro-magnet perpendicu-larly arranged upon a metallic frame which is securelyfastened to a wooden base. The fine wires of the electro-magnet are connected by running through the wood andmetallic base to the two binding posts. Directly abovethe electro-magnet an armature is horizontally arrangedupon a lever in a frame to work freely by the action TELEGRAPHY 29 of the electric current. A spring is used to draw thelever away from the magnet when the circuit is are two adjustable screws, one in the lever whichgoverns the movement toward the magnet; the other inthe frame which governs the reverse . movement. The sounder is connected with the local circuit only; havingits connections attached with the two local bindingposts of the relay and the two poles of the local battery. ADJUSTMENT OF INSTRUMENTS. TH£ key. The movement of the key should always be free;that is, do not have
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectrailroadtrains, booky
