Telephones, their construction and fitting; a practical treatise on the fitting-up and maintenance of telephones and the auxiliary apparatus (1892)
Allsop, Frederick Charles · London, New York, E. & F.N. Spon · leaf 204
rth or return wire, if such is used, from earth toreceiver 6, and back to secondary of coU n. Different Methods of Arranging Instruments. The diagrams that have so far been given relate chieflyto the internal connections of the instruments; but those thatnow follow show the various ways of… … Fig. 172. -TJ ~T >- >■ l^
Telephone
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