. Cassier's magazine. in Fig. 15. If the superstructure of a revolvingcrane be mounted on a high tower builtof lattice-braced legs, we have an im-posing type which is adapted for ship-yards and wharves. A 75-ton crane ofthis kind, made by the DiisseldorferKrahnbaugesellschaft Liebe - Harkortm. b. H., is shown in Fig. 17 with aderricking jib. SPECIAL FORMS OF CRANES 393 r_ The modern type of Titan craneis a machine which has been evolved bythe trying conditions of very heavyservice on exposed sea fronts. Thereare some cases of Titan cranes hav-ing been blown over into the sea in spiteof their i
. Cassier's magazine. in Fig. 15. If the superstructure of a revolvingcrane be mounted on a high tower builtof lattice-braced legs, we have an im-posing type which is adapted for ship-yards and wharves. A 75-ton crane ofthis kind, made by the DiisseldorferKrahnbaugesellschaft Liebe - Harkortm. b. H., is shown in Fig. 17 with aderricking jib. SPECIAL FORMS OF CRANES 393 r_ The modern type of Titan craneis a machine which has been evolved bythe trying conditions of very heavyservice on exposed sea fronts. Thereare some cases of Titan cranes hav-ing been blown over into the sea in spiteof their immense mass. In daily serv-ice the strains on the various membersare most severe. To move such heavy from the rail clips or blocking girders ofthe light cranes. The easy travelling of such a mass isonly possible by distributing the loadover a number of wheels, from twelveto sixteen, and by taking the thrust ofthe axles on springs. None of the early Titans had springs, and the resultwas sometimes that wheels broke, and. 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
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