The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 514
Fig. 454.—Metal Case C.B. Radial-Arm Instrument(Brtiish Insulated & Helsby Cables) THE BRITISH INSULATED CO.S EXCHANGES 485 merit it has been arranged that the transmitter can be slidbackward and forward to an. extent of about 1J inches so asto accommodate to the face length of any individual.… … Fig. 455.—Metal Table Instrument. C.B. Adjustable Transmitter (British Insulated & Relsby Cables) also been adopted in the provincial trunk exchanges installedby the British Insulated Co. in the various towns alreadymentioned. The sections of the board are 3-panel ones similarto those shown in…
Telephone
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