File:Transactions (1852) (14779569424).jpg

Identifier: transactions58nort (find matches)
Title: Transactions
Year: 1852 (1850s)
Authors: North of England Institute of Mining and Mechanical Engineers, Newcastle-upon-Tyne North of England Institute of Mining and Mechanical Engineers, Newcastle-upon-Tyne. Report of the Committee upon mechanical coalcutting, 1905
Subjects: Mineral industries Mechanical engineering
Publisher: Newcastle-upon-Tyne
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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tons of cargo, is almostnegligible. There are two or three more forms of boxes, butthey have a great sameness of action. With the above anti-breakage boxes, to attain the maximumefficiency during shipment, the speed of loading should not ex-ceed 100 tons per hour. It is claimed that 150 tons per hour hasbeen loaded; but, as the boxes only hold about 1£ tons, thisequals 100 double trips per hour or nearly 2 per minute, atwhich rate it seems impossible to take full advantage of theanti-breakage part of the boxes, that is, of the coal being tipped afew feet below the shoot. These various forms of anti-breakage box are all dislikedby the workmen, and consequently are often dispensed with;and, when used, only about the first 50 tons of each cargo ishandled in this way, after which the ordinary spout-teeming isadonted. COAL-SHIPMEXT AND THE LAYING-OUT OF STAITHE HEADS. 241 (4) Lewis-Hunter System.—Another form of anti-breakagearrangement is the Lewis-Hunter system (Fig. 66), in operation
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Fig. 66. —Lewis-Hunter Patent Coaling Cranes, Bute Docks, Cardiff. at the Bute and Queen Alexandra docks, Cardiff. The prin-ciple of the system is that the wagon is tipped into a large box,which in its turn is discharged into the vessels hold. Figs. 242 COAL-SHIPMENT AND THE LAYING-OUT OF STAITHE HEADS. 28 and 29 (Plate XXXI.) illustrate this appliance, whichconsists of a rectangular box with a movable bottom, made ofcast-iron, and pyramidal in shape. To the centre of it, themain crane chain is attached, and is carried through a guidein the hood of the box, so that when the box is being lifted by thechain it will still keep right-side up. Attached, one on each sideof the guide of the main lifting chain, are two chains, alsoattached to the crane. When the box is being emptied, theweight is hanging from these two chains. The action of the box is as follows: —It is first lowered emptyinto a pit of a depth equal to about three-quarters of the height ofthe box, so that the mouth of the

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