File:Telephones and telegraphs- 1902 - (and Municipal electric fire alarm and police patrol systems) (1906) (14569638219).jpg

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English:

Identifier: cu31924022817674 (find matches)
Title: Telephones and telegraphs: 1902 : (and Municipal electric fire alarm and police patrol systems)
Year: 1906 (1900s)
Authors: United States. Bureau of the Census Steuart, William Mott, 1861- Martin, Thomas Commerford, 1856-1924 Abbott, Arthur Vaughan, 1854- Mayer, William
Subjects: Telephone Telegraph Fire alarms
Publisher: Washington : Govt. Print. Off.
Contributing Library: Cornell University Library
Digitizing Sponsor: MSN

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TELEPHONE CONDUITS NEAR STREET RAILWAY TRACK.
Text Appearing After Image:
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 passageway which is built beneath ahighway and in which one or more cables may beplaced. In the first efforts to build underground linesthe simple plan was adopted of burying a cable eitherdirectly in the ground or in a trench or box filled withsand. But this means that the cable is inaccessibleunless the pavement is lifted, hence such built-in sys-tems were found to be impractical. For the so-calleddrawing-in systems pipe-like passageways are builtin the streets so that they open at intervals of from200 to 400 feet into vaults or chambers which affordaccess to the ducts. Thus the conduit and the cableare entirely distinct, and cables may at any time beintroduced or removed with no interfere

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27 July 2014

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