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 82
FIG. 1.—SMALL MAGNETO SWITCHBOARD. FIG. 2.—REAR VIEW OF MAGNETO SWITCHBOARD. … EARLV TELEPHONE EXCHANGE IN NEW YORK CITY. CENTRAL OFFICE OR EXCHANGE. 47 function is to draw the cord back to its place as soonas the operator has removed it from the jack and thuskeep the cord shelf free. A rear view, showing theapparatus contained, is given in Fig. 2 on platefacing page 46. An…
Telephone · Telegraph · Fire alarms
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