. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. m^p^^>^w^m&m are provided at their upper ends with rollers, which run within a tubular rail F having a continuousslot on its under side, as shown to a larger scale in the section Fig. 969 ; and the slings are hauledin by the chains G, worked by powerful steam winches. The frame B being lowered and the ship. 3^Wp^^S*?^%f?^#^ ,. = .-^^ over it, the chains are then hauled in, so ns to pull the slings horizontally, thereby raising the framing until the ship is lifted out of the water. This arrange
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. m^p^^>^w^m&m are provided at their upper ends with rollers, which run within a tubular rail F having a continuousslot on its under side, as shown to a larger scale in the section Fig. 969 ; and the slings are hauledin by the chains G, worked by powerful steam winches. The frame B being lowered and the ship. 3^Wp^^S*?^%f?^#^ ,. = .-^^ over it, the chains are then hauled in, so ns to pull the slings horizontally, thereby raising the framing until the ship is lifted out of the water. This arrangement has the advantage of giving a nearly uniform strain on the chains and machinery throughout „^„ the lifting of the vessel, inasmuch as at the commencement, when the supports are nearly horizontal and carry but little of the weiglit, the slings are vertical and the weight of the ship is almost entirely carried by the water; while by the time the ship has lost the support of the water and the slings have become inclined, the supports have assumed a position more nearly upright, and therefore, although the whole weight of the ship has now to be borne by the lift, the proportionate strain coming on the chains is but small. In the lift designed by Scott, Fig. 970, the ends B B of the crosstimbers of the platform A, weiC attached to slings depending from thecrossheads of a number of vert
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
