File:Factory and industrial management (1891) (14577827777).jpg

Identifier: factoryindustria15newy (find matches)
Title: Factory and industrial management
Year: 1891 (1890s)
Authors:
Subjects: Engineering Factory management Industrial efficiency
Publisher: New York (etc.) McGraw-Hill (etc.)
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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he power station. It is evident that, if the current, inpassing along the rail, reaches an open joint, it will pass into theearth and back into the rail, bridging this joint. The same actionwill occur if a joint in an iron water pipe or a gas main offersresistance to the current. The effect of electrolysis can be reducedto a minimum, or to a negligible amount, by taking certain pre-cautions and maintaining a periodical inspection and tests of thereturn flow. The rail itself generally offers abundant conductivity, except onvery large roads. But, as the rail is not continuous, the conductor isbroken up into lengths, which are connected by splice bars. Oxideof iron being a partial insulator, these splice plates do not make agood electrical connection between adjacent rail ends. In order tomake the rail a continuous conductor, some way must be found tobridge around and connect the rail ends electrically. The bondingof these rails has been a matter of considerable study, and the evolu- 451
Text Appearing After Image:
FK;. I. TIIK KVOLUTION OK TIIK RAIL HOND. ShowiiiK the dcvclopmctit from the siRnal-wire connection throuKh the various forms ofcopper rod bonds, brazed plate bonds, cast-weld joints, etc., to the continuous wire con-ductor connected to every Joint. OF KLRCTRIC RAIL WA VS. 453 tion of the rail bond is given on page 452, where the different formsthat have been used are shown. First is shown the simple methodadapted from the railroad signalling systems,—an iron wire securedunder the head of a rivet. The next step was to use several of thesein jilace of one, introducing them around the fish plate. The nextwas to substitute copper wire for these galvanized iron bonds; thematter of making contact between the copper wire and the rails hasbeen the subject of a number of patents, and bonds of various typesare now on the market. The channel pin has been used extensively.A hole is drilled through the rail, the copper wire is threaded throughthe hole, and enough room is left between the hole a

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