Is a ship canal practicable?; Notes, historical and statistical, upon the projected routes for an interoceanic ship canal between the Atlantic and ... and influence of the canal of Suez, an - Softcover
Synopsis
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. 1872 Excerpt: ...45-5 325.0c 200.00 Among railroad tunnels, the following are selected from different parts of the continent: The cost of the Thames tunnel was greatly increased by a shield, designed by Brunei, to keep out the water. Omitting this tunnel from comparison the English works exceed the French, or Continental, in cost of construction. The boldest work of the kind yet undertaken is the Mt. Cenis lunnel, to connect France and Italy by a continuous railway. In length it is seven miles, with a width of 26' 6" and a height of 20' 8". Its completion is anticipated in April, 1871. The monthly advance by hand-labor was twenty-two and a-half yards. The progress is doubled by machinery, and during the past year has averaged 330 feet per month. Air, compressed by water power, is conveyed inside to give motion to chisels, which form cavities for blasting by gunpowder. The average progress per day in 1865, with the machinery, was about 9 feet. The estimated cost was $550 per running foot, but the rate was increased to §640; the entire cost of the tunnel being estimated at §9,200,000. The use of machinery at Mt. Cenis was found to expedite the work, but at an increase of expense. The trial of machinery at the Iloosac tunnel, upon the Troy and Gieenfield Railroad, has not been favorable to its employment. This tunnel will be four and three-quarter miles long. Originally projected with a width of 24 feet, and a height of 20 feet, it has been contracted to 14 feet wide, and 18 feet high. The estimated cost was §2,696,229. The rate first assumed was $137 per running foot. The rate per cubic yard varies from $5 to $22, and $30, for the excavation of shafts. 48 Cost of Open Canal. The contract prices for the Hoosac tunnel, in 1869, lows: Tunnel enlargement,...
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