Abstract
For the purpose of gammg information as to the efficiency of hoisting tackle, an extended series of tests was made recently at the Pencoyd plant of the American Bridge Company, with standard types of blocks, and various combinations of manila and wire rope. The tests were arranged so as to reproduce, as nearly as possible, actual conditions under which hoisting tackles are used in the field. An eye-bar testing machine, of 300 tons capacity, and a vertically moving hydraulic crane, were used in making the tests.
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