Automatic telephony; a comprehensive treatise on automatic and semi-automatic systems (1921)
Smith, Arthur Bessey, b. 1875, Campbell, Wilson Lee · New York : McGraw-Hill · leaf 445
1^ per cent Annual charge on pole lines 213-2 per cent Annual charge on aerial cable and suspension 143-2 Por cent Additional Main Offices.—In a very large city system covering manysquare miles and including not only a number of suburbs or former suburbswith their own business centers, but also… … 1000 Lines $000 Lines Fig. 314, 500 Lines-Diagram representing hypothetical system of 4 main offices A, B, C, and Dand 4 subsidiary offices, A-6, A-7, C-6, and C-7. city is to make studies with the main offices at the points which appearto be the most likely locations for them, and then as far as…
Telephone
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