The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 48
Fig. 13 Scale f Fig. 14 advantage over the ordinary straight V-shaped gauge ofgiving a much larger practicable range within smallerdimensions. 26 PRACTICAL TELEPHONE HANDBOOK Copper Wire.—The following are very useful formulae foithe calculation of resistance, etc., of pure copper wires,…
Telephone
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