. Multiplex combinations for economic telegraphy and telephony . Repeating Coil Duplex. O-O ~H 5) U #14. In the impedence coil duplex, telephones a and b are themain line phones. Telephones c and d, impedance coile m,m , n,nand the line wires constitute what is termed a phantom circuit(ghost circuit)y because it is an extra circuit obtained withoutthe addition of any more line wires than are already in use fortelephones a and h % In the repeating coil duplex, telephones a andi>are themain line phones for one circuit, and phones e and f are the samefor another circuit. In this system, teleph
. Multiplex combinations for economic telegraphy and telephony . Repeating Coil Duplex. O-O ~H 5) U #14. In the impedence coil duplex, telephones a and b are themain line phones. Telephones c and d, impedance coile m,m , n,nand the line wires constitute what is termed a phantom circuit(ghost circuit)y because it is an extra circuit obtained withoutthe addition of any more line wires than are already in use fortelephones a and h % In the repeating coil duplex, telephones a andi>are themain line phones for one circuit, and phones e and f are the samefor another circuit. In this system, telephone c, secondaries8 and a of circuits 1 and 2.,respectively, and telephone d con-stitute the phantom circuit. The external line of circuit 1 istermed the Physical1* for telephones a and h . Likewise, theexternal line construction for circuit 2 is the Physical fortelephones e and f « # Representative Circuits between Cities & Intermediate Towns. In the accompanying schematic drawings with this Article,the main line telephone terminations, phantom circuits, telegraphsimplexe
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelephone, bookyear19
