File:Cassier's magazine (1904) (14746072016).jpg

Identifier: cassiersmagazi2719041newy (find matches)
Title: Cassier's magazine
Year: 1891 (1890s)
Authors:
Subjects: Engineering
Publisher: New York Cassier Magazine Co.
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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mes& Rapier, its most obvious feature beingthe height, which is unusual in thisclass of crane. This was embodied fora similar reason to that of building the Titans at a good elevation, to per-mit of the passage of trucks underneath,—in this case railway trucks at Parkes-ton. It is, therefore, in this sense a bigportal crane of very powerful build, lift- ing 30 tons at a maximum radius of 36feet, a load which it will hoist to a heightof 50 feet. For lesser radii the jib ismoved nearer the vertical. Here wenote the great mass of 120 tons carriedon twelve wheels with leaf springs. Allthe motions, including the travelling,are made through toothed wheels drivenfrom the pair of engines on the revolv-ing superstructure. The mass of thejib is lessened by adopting the doubleparabolic and lattice-braced design.Wire ropes are used for lifting and rais-ing or lowering the jib. The super-structure is rendered stable in all posi-tions of the jib by the large diameter of 4-QO CASSIERS MAGAZINE
Text Appearing After Image:
SPECIAL FORMS OF CRANES 401

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