. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . olves the principle of differentiation in magnet coils whichplays so important a part in duplex telegraphy. A descriptiontherefore forms a convenient stepping stone to the subject of mul-tiplex work, which opens up a new and interesting field. A theoretical diagram of the Weiny=Phinips repeater isshoM-n in Fig. 23. As in the Milliken, there are three distinctsets of circuits in duplicate; that is, one set represe
. Cyclopedia of applied electricity : a practical guide for electricians, mechanics, engineers, students, telegraph and telephone operators, and all others interested in electricity . olves the principle of differentiation in magnet coils whichplays so important a part in duplex telegraphy. A descriptiontherefore forms a convenient stepping stone to the subject of mul-tiplex work, which opens up a new and interesting field. A theoretical diagram of the Weiny=Phinips repeater isshoM-n in Fig. 23. As in the Milliken, there are three distinctsets of circuits in duplicate; that is, one set represents the East^the other the AVest side of the apparatus; and in all three diagrams,Figs. 21, 22, and 23, the parts performing like functions are sim-ilarly outlined and lettered. The connections of the main line(full line), and of the local (dotted) circuits are identical with thoseof the Milliken. But, instead of the extra magnets E and AV andthe pendent armatures P and P of the repeater last named, thereis a device which effects the same end; and, for the reason alreadyindicated, it requires some attention because of the new principle•involved. 295 66 THE ELECTRIC TELEGRAPH. 296 THE ELECTRIC TELEGRAPH 67 In E and W we have an iron shell enelosingr a straight ironcore and its winding. The combination of shell and core performsthe same functions as the parallel cores in the common tyj)e ofrelay. Trace the wire from battery h to the core W; at a pointjust above the core the circuit splits; one part winds round thecore to the left, and goes to the middle point of the lever of thetransmitter; thence back to the zinc pole of battery h. The otherpart goes to the right, and back to transmitter T at the under-stopof the lever. Each division of the magnet coil contains the samenumber of turns of wire round core W. When transmitter T isclosed, since the lever makes contact with the under-stop, the cur-rent from battery h traverses the coils of core AV in opposite direc-tions; the resul
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