File:Factory and industrial management (1891) (14594402320).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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it is not advisable to raise the track and runway to thelevel of the bridge, doing away with the legs; but where this can bedone we have the three-motor electric traveling cranes now so famil-iar in stone yards and all manufacturing concerns where heavy loadshave to be handled quickly. These bridges can be built to spanalmost anything, from lo feet up to several hundred feet, thoughthere are very few of over 200 or 250-feet span on account of thegreat cost; in the case of a big dam or other structure, however,,the expense is justified. Obviously the legs of a gantry make it cost more than a plain-bridge of the same capacity if the cost of the runway is disregarded,so if a number of machines were required in the same yard the in-creased cost would often be enough to pay for the elevated runway. Gantries are rarely used in shops except for carrying heavyriveting or punching machines, or similar tools, as the walls of theshop afford such a good purchase for the runways; these are usually
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EXAMPLES OF MODERN AMERICAN TRAVELING CRANES. Above is a 10-ton gantry for unloading cars, C. M. & St. P. Ry., Chicago. Below is a 5-tonwall crane for the Buckeve Steel Castines Co. Both installed bv the Case Mfg. Co. yi

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