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Inhaltsangabe
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...action of the battery, one of the plates constantly wears away. The same action takes place underground in many cases, due principally to the escape of the electric current from electric railway circuits, the pipes in this case representing that metal in the battery which is attacked and destroyed. Generally the eletrirc current of the railway system is carried from the power station through heavy wires, and returns through the tracks. The latter are not insulated or protected in any way, and if the current finds an easier passage through some nearby pipe than through the rail, it will jump from the latter into the pipe, later on returning to the rail again. Whenever there are two paths for the current, it will divide between them, the greater part of the current taking the path which presents the least resistance. The points where rails come together present the points of greatest resistance in the rails, and are the points where the most trouble occurs. If the current passed into the pipe and did not have to leave it again, no damage would result to the pipe, but at those points where the current jumps from the pipes back to the track or to some other conductor, the pipe becomes corroded and finally eaten entirely through. No harm results, however, at points where the current enters the pipe. TESTING OF THE PLUMBING SYSTEM. What is the purpose of the testing of the plumbing system? Such a test is made for the purpose of revealing defects in materials and workmanship, and wrong connections. What two general tests are applied? The two tests are the roughing test, made when the roughing has been completed, and the final test, made when the fixtures have been placed in position and the system made entirely ready for use. What are the tests applied to the roug...
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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1919 Excerpt: ...action of the battery, one of the plates constantly wears away. The same action takes place underground in many cases, due principally to the escape of the electric current from electric railway circuits, the pipes in this case representing that metal in the battery which is attacked and destroyed. Generally the eletrirc current of the railway system is carried from the power station through heavy wires, and returns through the tracks. The latter are not insulated or protected in any way, and if the current finds an easier passage through some nearby pipe than through the rail, it will jump from the latter into the pipe, later on returning to the rail again. Whenever there are two paths for the current, it will divide between them, the greater part of the current taking the path which presents the least resistance. The points where rails come together present the points of greatest resistance in the rails, and are the points where the most trouble occurs. If the current passed into the pipe and did not have to leave it again, no damage would result to the pipe, but at those points where the current jumps from the pipes back to the track or to some other conductor, the pipe becomes corroded and finally eaten entirely through. No harm results, however, at points where the current enters the pipe. TESTING OF THE PLUMBING SYSTEM. What is the purpose of the testing of the plumbing system? Such a test is made for the purpose of revealing defects in materials and workmanship, and wrong connections. What two general tests are applied? The two tests are the roughing test, made when the roughing has been completed, and the final test, made when the fixtures have been placed in position and the system made entirely ready for use. What are the tests applied to the roug...
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