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The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 369
10 5 32 6i 9i 112 5-6 34 H 9| 125 6-25 36 6J 10 14 7 38 6* m 15 7-5 40 6* 10| 17 8-5 45 6| 1H 21 105 50 7 12J 28 14 55 n 13 33 16-5 60 n 13| 40 20 65 H 14i 45 22-5 70 7* 14f 50 25 75 8 15|- 55 27-5 80 81 16* 65 325 85 8* 15| 75 37-5 34o PRACTICAL TELEPHONE HANDBOOK Earth Wiring.—The same figures…Telephone
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