The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 593
1 (tx and t/),as single line and earth circuit, and the other, No. 2 (t2 and t2)%as a loop circuit. In the former case, the two wires are used 564 PRACTICAL TELEPHONE HANDBOOK in parallel as one of double size. The resistances R and r mustbe equal, as must also be r1 and r1, and it is also…
Telephone
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