Transactions . total tonnage exported from these docks in1907 amounted to 9,910,485 tons, of which 4,906,082 tons tookplace during the second half, and the machines adopted (with onenoticeable exception) are similar to the last described. Three ofthese hoists, however, are movable, and travel parallel with thequay, enabling them usually to work simultaneously in coaling * See Cranes, page 210. t See Belts, page 170. COAL-SHIPMENT AND THE LAYING-OUT OE STAITHE HEADS. 191 one vessel. Each coal-tip has two weighbridges; wagons can,therefore, be weighed when full and when empty. Fig. 40 illustrate
Transactions . total tonnage exported from these docks in1907 amounted to 9,910,485 tons, of which 4,906,082 tons tookplace during the second half, and the machines adopted (with onenoticeable exception) are similar to the last described. Three ofthese hoists, however, are movable, and travel parallel with thequay, enabling them usually to work simultaneously in coaling * See Cranes, page 210. t See Belts, page 170. COAL-SHIPMENT AND THE LAYING-OUT OE STAITHE HEADS. 191 one vessel. Each coal-tip has two weighbridges; wagons can,therefore, be weighed when full and when empty. Fig. 40 illustrates a 20-ton hydraulic coal-hoist of the direct-acting type in use at the Barry dock. The framing is 73£feet high by 26| feet wide from the dock side, 40 feet widein front, and 23J feet wide at the back at the base, the dis-tance between the guides being 14^ feet. The cradles are 24feet 2 inches long, 14 feet GJ inches wide outside the guide, 13^feet wide inside the opening, and fitted with a tip-table suitable. Fig. Hydraulic Coal-hoist (direct-acting type),Barry Dock, South Wales. for wagons of 4 feet 8| inches gauge and 22 feet long over thebuffers, and are capable of being tipped ro an angle of 45 hoist is fitted with a 4-ton anti-breakage crane, the max-imum range being 30 feet, and the minimum range 12 feet, whilethe lift is 65 feet. The cradle travels in the vertical guides, is raised andlowered by means of direct-acting cylinders placed between theguides, and has a lift of 45 feet. 192 COAL-SHIPMENT AND THE LAYING-OUT OF STAITHE HEADS. The cradle is fitted with a tip-table hinged at the front end,and is tipped by means of wire ropes, one at each side, which arefastened to the bottom of the framing, passing around pulleys onthe cradle, around pulleys on the tipping-table, over pulleys onthe top of the framing, and around pulleys at the jigger cylinderfixed at the side of the framing. The pressure-water is putinto the jigger cylinder, takes up the ro
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