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 64
FIG. 3.—MAGNETO BELL. … FIG. 4. —MAGNETO GENERATOR ASSEMBLED. FIG. 5. —MAGNETO GENERATOR DISSECTED. APPARATUS OF THE SUBSTATION. 37 the series method in electric Ughting with arc lampsand the multiple or parallel method of lighting withincandescent lamps. The older, or series, type oftelephone is usually provided with a…
Telephone · Telegraph · Fire alarms
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