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Oppenheimer poles are galvanised iron telegraph poles. They consist of three oval sections that collapse into each other telescope-style for transportation. Once extended, the joints between the sections are clamped with collars. The pole is fixed to a base for support with a u-bolt. The poles were used in the construction of the Australian ...
The receiver's sale was completed in 1912, with the Chicago Tunnel Company, a wholly owned subsidiary of the Chicago Utilities Company, acquiring all assets of the former company and its affiliates, the Chicago Warehouse and Terminal Company and the Illinois Telephone and Telegraph Company. In 1913, the Chicago Tunnel Company agreed to sell its ...
January 22, 1848 map in New York Herald showing extent of existing and planned North American telegraph lines. At this time, the service area for the United States reached Petersburg, Virginia in the south, Portland, Maine in the northeast, Cleveland, Ohio in the northwest, and as far west as East St. Louis, Illinois.
The facility that eventually became South Works began in 1857 under the name of the North Chicago Rolling Mill, which was located in the northern part of the city of Chicago. [1] The plant later moved to South Chicago because raw materials could be shipped in via Lake Michigan , as well as an existing labor pool and available fresh water from ...
A utility pole, commonly referred to as a transmission pole, telephone pole, telecommunication pole, power pole, hydro pole, telegraph pole, or telegraph post, is a column or post used to support overhead power lines and various other public utilities, such as electrical cable, fiber optic cable, and related equipment such as transformers and ...
Earth-return telegraph is the system whereby the return path for the electric current of a telegraph circuit is provided by connection to the earth through an earth electrode. Using earth return saves a great deal of money on installation costs since it halves the amount of wire that is required, with a corresponding saving on the labour ...
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A Catalog of Telephone and Telegraph Tokens of the World. Leiden 1989. Targonsky, Paul: A Catalogue of Telephone Tokens of the World. Published by the author. Meriden, Conn., 1968; van Dam, Rik: A Catalogue of Telephone Tokens of the World. A catalog in progress, started in 2016. www.telephonetokens.com