The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 513
Fig. 453.—Wood Case C.B. Radial-Arm Wall Instrument {British Insulated & Eelsby Cables) … 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.…
Telephone
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