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
Fig. 172. -TJ ~T >- >■ l^ … BCLL Two Stations with Magneto Switch-bell Instrument, and Microphone Transmitters. An Extension Bell and Two-way Switch are also shown at the Righthand Station CONNECTING-UP. 181 The line and earth terminals only are shown, as allthe other connections are internal, and do not in any wayaffect the…
Telephone
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