The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 309
E HANDBOOK on the switch-board, it does not matter to the operator whatis the actual number of a calling line so long as the jacks inthe multiple field are kept in strict numerical order, so thatany called-for line may be found at once. This board is also found convenient for connecting to… … 24V Fig. 285.—Apparatus-Room. Line Connections frames, etc., can be readily traced. This figure should becompared with Fig. 242. The Main Distributing Frame is made up of a strong verticalsupporting frame of angle iron (shown at a in Figs. 286, 287, and288), to which a large number of iron bars, v…
Telephone
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