. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . cO a p. o o o. 286 HOISTING MACHINERY it may pass to a railroad car or to a trough or bin back ofthe unloader, from which it may be moved to a storage pileby the use of a storage bridge crane. Tower unloaders of this type are also sometimes equippedwith buckets operated by a rope trolley. The bucketlines are reeved through sheaves on the boom and on atrolley which may be moved in either direction on the boomby an endless rope
. Material handling cyclopedia; a reference book covering definitions, descriptions, illustrations and methods of use of material handling machines employed in industry . cO a p. o o o. 286 HOISTING MACHINERY it may pass to a railroad car or to a trough or bin back ofthe unloader, from which it may be moved to a storage pileby the use of a storage bridge crane. Tower unloaders of this type are also sometimes equippedwith buckets operated by a rope trolley. The bucketlines are reeved through sheaves on the boom and on atrolley which may be moved in either direction on the boomby an endless rope attached to the two ends of the trolleyand making several turns around the winch drum. A ma-chine of the one-man type has a capacity ranging from 100to 1000 tons per hour, depending on the size of the bucket. Mast and Gaff The mast and gaff type of unloader is particularlyadapted for use in small coal yards; at small coal wharves;or at power plants. This rig is a modification of the guyand the stiff-leg derricks. Being used chiefly for lightbucket work, it generally is of comparatively light woodenconstruction although steel members of light lattice con-struction, sometimes are
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Keywords: ., bo, bookcentury1900, bookdecade1920, booksubjecthoistingmachinery
