The Mechanical Handling and Storing of Material

THE MECHANICAL HANDLING OF MATERIAL 480 for operating the conveyor and elevator e, as 1 At Rotterdam similar “ Harpen” since 1909. shown. Both engines are fed from the boiler f. The unloading capacity is over 200 tons of coal per hour. Coaling Barges of Werf Conrad, Haarlem, Holland.—This is a well-known type in Continental docks, and one such installation is in use by the Hamburg-American Line at Hamburg.1 Figs. 666 and 667 show a diagram of the same, and Fig. 668 shows a perspective view. The bucket elevator a passes under the coal bunkers a, which deliver the contents through openings governed by slides ; b is an automatic weighing machine. The conveyor passes up the jib c and delivers from a receiver down the shoot d to the liner. The shoot d is manipulated by a 5-ton crane at the end of the jib. The length of the hoppered barge is 157 ft., 36 ft. beam, and 30 ft. deep. The holding capa- city is 800 tons, with a draught of 14 ft., and the delivery is at the rate of 200 tons per hour. Seven men only are necessary for all the work. A 100 H.P. compound engine drives the machinery as well as propels the barge. Although the whole construction gives one the impression of stability, it seems at the same time ungainly and difficult to moor in a suitable position for loading. There are various other self-un- loading appliances, and one of the latest examples is the self-unloading collier, the “ Hermann Sauber,” built by Messrs William Doxford & Sons, Sunderland, which has a total dis- charging capacity of 800 tons per hour. The time taken to unload 5,000 to 6,000 tons would be from six to eight hours, and six men only would be required. The Coaling Barge at Dox- ford Wharf, Sunderland.—This ships are in use: the “Pluto” since 1905, “Prosper” since 1907, and They all transfer coal at the rate of 100 to 250 tons per hour.