. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. orm A on which the vessel was to be lifted, the ends B of the trans-verse timbers of the platform being steadied by two parallel rows of piles 0 C, placed far enoughapart to admit the vessel between them. The longitudinal timbers which connected tlie heads ofthe piles carried a number of vertical screws, as many as forty-six having been used in one instance,the lower ends of which were connected to the transverse timbers of the platform, so as to raise thevessel out of the water. Since 1836, however, this
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. orm A on which the vessel was to be lifted, the ends B of the trans-verse timbers of the platform being steadied by two parallel rows of piles 0 C, placed far enoughapart to admit the vessel between them. The longitudinal timbers which connected tlie heads ofthe piles carried a number of vertical screws, as many as forty-six having been used in one instance,the lower ends of which were connected to the transverse timbers of the platform, so as to raise thevessel out of the water. Since 1836, however, this lift has been worked by means of hydraulicpresses. Fig. 967 is of the arrangement at work at New York in 1853. Chains, shown by thedotted lines, are attached to the ends of the transverse bearers B B of the platform, and pass over 438 DOCKS. pulleys to the long traction bars D, the land ends of which are connected to the hydraulic presses Efor lifting the platform with the ship upon it. In 1842, an improvement ujon the screw lifting dock was proposed by Robert Mallet, Figs. 968, 9G9. The framework B on which the ship is to be raised is carried on a number of supports C 0,hiiiged at their lower ends to eyes D, supported on the rock or on piles, and at their upper ends to theframe B, forming a sort of parallel ruler motion. The slings E attached to the top of the supports 0 967.
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
