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 218
t-POIMT S\NITCH Three Telephone Stations, No. 1 of which is able to communicate with No. 2 or No. 3, but notThe Station not speaking to No. 1 rings up on the Extension Bell. eXTENSIOAfBELL \E^kTH I No. 2 with No. S. … STATION /V22l \ef>RTH I CONNECTING-UP. 191 person who uses the instrument wishes at times to leave hisoflBce for another part of the building where the bell would befixed. When the handle of the switch (which is a three-pointone, as shown in Fig. 91) is to the left, the extension bell…
Telephone
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