Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems] (1906)
United States. Bureau of the Census, Steuart, William Mott, 1861-, Martin, Thomas Commerford, 1856-1924, Abbott, Arthur Vaughan, 1854-, Mayer, William · Washington : Govt. Print. Off. · leaf 54
FIG. 3. —RECEIVER DISSECTED. FIG. 4.—DESK SET, RECEIVER AND TRANSMITTER. DiAGEAM 1,—Telephone caMs hy Jiours, husiness, center, residence district, Diagram 2.—Telephone coils per line in the three districts of a large cityand outsKrts of a large city: 1902. shown hy hours in Diagram 1: 1902. 16000…
Telephone · Telegraph · Fire alarms
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