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 74
TELEPHONE CONDUITS NEAR STREET RAILWAY TRACK. … GROUP OF 24 DUCTS IN TELEPHONE CONDUIT SHOWING STANDARD PRACTICE. THE WIRE PLANT. 43 about 300° P. and the sleeve is filled with meltedchatterton or other cable compound, which uniteswith the rubber coveiing of the leading out wires. Telephone conduits.—A telephone conduit is a longlongitudinal…
Telephone · Telegraph · Fire alarms
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Telephones and telegraphs: 1902 : [and Municipal electric fire alarm and police patrol systems], 1906, leaf 74](https://img.insideoutlibrary.com/img/1024/ia-cu31924022817674-74-30.webp)
