. Cassier's magazine. 25-TON ELECTRIC REVOLVING WHARF CRANE, 44 FEET RADIUS, BUILT BYTHE NAGEL & KAEMP IRONWORKS CO., HAMBURG, GERMANY cranes, weighing from 200 to 300 tons,along a pair of rails with a load of thirty,forty or fifty tons hanging out 50 feetor more from a cantilever jib, and toslew such a load around with perfectstability and safety and also to rack theload along the jib with smoothness ofmotion, are problems not easy of solu-tion. There is no aid to stabilty derived 5-4 the rails bent and sunk locally in placeswhere the load became springs are used, either t
. Cassier's magazine. 25-TON ELECTRIC REVOLVING WHARF CRANE, 44 FEET RADIUS, BUILT BYTHE NAGEL & KAEMP IRONWORKS CO., HAMBURG, GERMANY cranes, weighing from 200 to 300 tons,along a pair of rails with a load of thirty,forty or fifty tons hanging out 50 feetor more from a cantilever jib, and toslew such a load around with perfectstability and safety and also to rack theload along the jib with smoothness ofmotion, are problems not easy of solu-tion. There is no aid to stabilty derived 5-4 the rails bent and sunk locally in placeswhere the load became springs are used, either two orfour to each journal, or the leaf springsseen in Figs. 17 and 18. The strain onthe forward wheels is terrific at the mo-ment of taking the load, the end of thejib dropping several inches, and theeffect on the permanent way would be 394 CASSIERS MAGAZINE. FIG. 14.—A 5-TON ELECTRIC REVOLVING CRANE BUILT BY THE DUESSELDORFER LIEBE-HARKORT, M. B. H., DTJESSELDORF-OBERKASSEL, GERMANY SPECIAL FORMS OF CRANES 395
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