. Illustrated catalogue and general description of improved machine tools for working metal . xamination and a comparison with compet-ing cranes of the same rated capacity. We pay particular attention to the hooks of our cranes, which are care-fully designed, of correct mathematical proportions, and made of the best iron,forged and bent to shape. They are not steel castings. Our hooks are sus-pended upon ball-and-socket swivels, and in the larger sizes are provided in ad-dition with anti-friction ball bearings for easy rotation. In general, we claim for our crane machinery that it is simple an
. Illustrated catalogue and general description of improved machine tools for working metal . xamination and a comparison with compet-ing cranes of the same rated capacity. We pay particular attention to the hooks of our cranes, which are care-fully designed, of correct mathematical proportions, and made of the best iron,forged and bent to shape. They are not steel castings. Our hooks are sus-pended upon ball-and-socket swivels, and in the larger sizes are provided in ad-dition with anti-friction ball bearings for easy rotation. In general, we claim for our crane machinery that it is simple and acces-sible, efficient, and strong ; and for our clutches and the method of operatingthem, that we are able to put any motion into action without shock, to stop andstart the load without risk of injury to it, and to make small movements withease and certainty. We have drawings and patterns for a great variety of cranes not illus-trated in these pages, and are always prepared to consider cranes for specialpurposes. Wm. Sellers & Co., Incorporated, Philadelphia, Pa. 263 Plate No. 30-TON STEAM JIB-CRANE. In Foundry op the J. Morton Poole Co., Wilmington, Del. Height of post, 26 ft.; effective radius of hook. 23 ft. All movements bypower. Driven by independent 8 by 8 engines, bolted to frame carrying ma-chinery, receiving steam through upper pintle and discharging exhaust throughstep in foundation plate. 264 Wm. Sellers & Co., Incorporated, Philadelphia, Pa. Swing=Cranes. CRANES may be divided broadly into two general classes ; the first, includ-ing the swing or jib-cranes, derricks, etc.; and the second, the varioustypes of bridge-cranes, gantries, and overhead travelling cranes. Untilrecently overhead travelling cranes, even when driven by power, were slow in ac-tion, and capable therefore of a very limited amount of work. In establishmentsrequiring much lifting, the travelling cranes were supplemented by numerous jib-cranes, situated at points where frequent hoisting was
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Keywords: ., bookcentury1800, bookdecade1890, bookidillu, booksubjectmachinery
