Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . oundation mattress. The wholesurface of the mattress exposed i^then covered with rock. Dimen-sion stones, laid dry hut close to-gether, form the crown of the jet-ties, and appear above the the sea ends of the jetties arelong easy slopes and a covering ofheavy stone. Effect of the Jetties.—The act ofCongress enabling Captain Eads toundertake the construction of thejetties was passed March 3, 1875,and work was begun during thefollowing month of Mav. Up toMarch 4, 1876, 1,791,703
Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts . oundation mattress. The wholesurface of the mattress exposed i^then covered with rock. Dimen-sion stones, laid dry hut close to-gether, form the crown of the jet-ties, and appear above the the sea ends of the jetties arelong easy slopes and a covering ofheavy stone. Effect of the Jetties.—The act ofCongress enabling Captain Eads toundertake the construction of thejetties was passed March 3, 1875,and work was begun during thefollowing month of Mav. Up toMarch 4, 1876, 1,791,703 cubicyards of the volume of the barhad been removed. In June, 1S78,there was a channel 22 ft. deep ataverage flood tide throughout SouthPass and between the jetties todeeper water in the gulf. The leastwidth was 160 ft. See Annual Reports upon the Improvement of South Pass of the Mississippi River, by M. , Captain of Engineers U. S. A. A report by a commission of army officers to the Secretary ofWar made in 1879 establishes very fully the complete success of the works, and testifies to the con-. JOURNALS. 209 stant improvement in the jettied channel, resulting in its deepening to 23 ft. The Commissionalso testifies to the fact that, instead of there being a re-formation of the bar in front of the jetties,there has been a deepening of the water in advance of them, and a decided disappearance of barmaterial over an area of a mile and a quarter square. Stone and Wooden Jetties.—The cross-section and construction of a stone jetty differ in nothingfrom those of a breakwater, except that the jetty is usually wider on top, 30 ft. being allowed, as itserves for a wharf in unloading vessels. The head of the jetty is usually made circular, and consid-erably broader than the other parts, as it in some instances receives a lighthouse or a battery ofcannon. Wooden jetties are formed of an open framework of heavy timber, the sides of which are coveredon the interior by a strong s
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Keywords: ., bookauthorbenjaminpark18491922, bookcentury1800, bookdecade1880
