The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 508
THE BRITISH INSULATED CO.S EXCHANGES 479 The ultimate capacity of the boards is 10,000. The frameworkof the sections is strongly constructed of angle iron faced andfinished off at the front with polished mahogany. The cableshelves are of sheet iron, the one for the multiple cables com-pletely… … Fig. 450.—Arrangement of Apparatus at Rear of the Sections(Reproduced from Electrical Engineering by permission of the Proprietors) apparatus necessary for each operators equipment, as shownin Fig. 450 (which shows the three positions of a full section).The numbered squares are the backs of the…
Telephone
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