File:Factory and industrial management (1891) (14594415240).jpg

Identifier: factoryindustria35newy (find matches)
Title: Factory and industrial management
Year: 1891 (1890s)
Authors:
Subjects: Engineering Factory management Industrial efficiency
Publisher: New York (etc.) McGraw-Hill (etc.)
Contributing Library: Engineering - University of Toronto
Digitizing Sponsor: University of Toronto

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HEAVY LADLE CRANES IN AMERICAN STEEL WORKS. All are of 100-tons capacity with 25-ton auxiliary. The upper plant is the Union Steel Co., Donora, now part of the Carnegie Steel Co.; span 59 ft. 8 in., lift of main hoist 27 ft. and of auxiliary 31 ft. The lower is at the Illinois Steel Co. and is of 55 ft. span. Such an instalation is worth $29,000 to $25,000. The Well- man-Seaver-)\Ioigan Co. 41
Text Appearing After Image:
Niles crane, 20 tons, 80-foot span, with 5-ton auxiliary hoist. Rutland Florence Marble Co., Fowler, VT.
42 . HOISTING AND HANDLIXG MACHINERY. 43 the bottom flange, the whole trolley mechanism being inside themain girders instead of on top as in all the other cases. 5.—Two plate girders braced separately by three auxiliary lat-tice girders (six lattice girders in all), the eight girders forming twobox girders. Here the trolley rail rests on top of the main plategirders. There are many modifications but these five are the principaltypes. It was found advisable, in order to avoid complicated gearingand to make it simpler for the operator, to have a separate motor foreach motion, one for lifting, one for trolley travel and one bridgetravel; hence, the name three-motor electric travehng cranes. There are places where none of the previously described machinesis the best adapted for the purpose in view; such, for example, asbringing coal down the sides of a mountain, or mahogany logs tothe coast, over very rough ground w^here a railroad would not befeasible. In this case the cableway often s

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