. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. s warped backagain to the lift, and carefully fixed in positionover the lift girders. These are then raised tillthey take a small portion of the weight of thedock and ship. The sluice valves are opened, andthe water allowed to flow into the dock, which islowered as it fills. When the water outside isnearly to the tops of the side girders, the loweringis stopped to allow the water inside to rise to the same level as outside. The gates are thenopened, and the dock is further lowered till it is clear of the s
. Supplement to Spons dictionary of engineering, civil, mechanical, military, and naval. s warped backagain to the lift, and carefully fixed in positionover the lift girders. These are then raised tillthey take a small portion of the weight of thedock and ship. The sluice valves are opened, andthe water allowed to flow into the dock, which islowered as it fills. When the water outside isnearly to the tops of the side girders, the loweringis stopped to allow the water inside to rise to the same level as outside. The gates are thenopened, and the dock is further lowered till it is clear of the ship which is then hauled out into theVictoria Docks. The docking and undocking of the ship, having now been completed, the dock israised on the lift girders, the water flowing out from the gates and sluice valves. When sufficientwater has been drained out, the sluice valves are shut and the gates closed; and the lift girdersbeing then lowered, the dock is left afloat ready to be prepared for another ship, or to be removedto its berth so as to leave the lift free for other DOCKS. 441 The floating dock as thus described, meets its three principal requirements in the followingmanner;—It enables the hydraulic lift to raise ships of increased weight, by supplementing it withthe buoyancy caused by pumping out the water from the interior of the dock, the weight of thelatter being almost entirely neutralised by the buoyancy of its air chambers. It enables thehydraulic lift to take ships of increased length, by means of its projections at each end beyond thelift. It enables the hydraulic lift to take ships of increased draught, by depending for its longi-tudinal strength upon the box girders, which are at the sides and not beneath the ship, and bythus not requiring under the keel any greater depth than is just suflBcient for the transverse girders. In order to determine what strength the structure would require, sample ships embodyingextreme cases were taken for the calcu
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectenginee, bookyear1879
