Synopsis
Excerpt from Technologic Papers of the Bureau of Standards: Strength and Other Properties of Wire Rope
1. Purpose of Tests
There have been few systematic researches conducted by engineering laboratories to determine the physical properties of wire ropes. The tests which have been made by manufacturers are, as a rule, not available for critical comparative study by engineers. The investigations which have been made abroad, notably those by Tetmajer and the South African Commission, have covered particular types of constructions, such as cables for tramway and mine hoists. The results can not be strictly applied to American practice. The reason that systematic experimentation in this field has been somewhat limited may be attributed to the fact that it is difficult to obtain a large number of specimens for test purposes which have been selected under uniform specifications. The relative cost of preparing specimens is, moreover, as a rule, quite out of proportion to the yield of test data. A considerable range of variation may be expected in the observed data on different specimens, so that a larger number of test specimens is requisite in obtaining appropriate averages of physical properties than is ordinarily required in other tests upon the materials of construction.
It is the purpose in this paper to give a digest of the results of tests of about 300 cables selected under the specifications of the Isthmian Canal Commission. The specimens were submitted primarily for the purpose of fulfilling acceptance tests upon material used at the Canal Zone. The tensile strength of the specimens was the important consideration, but the major portion of the investigation has been of a purely supplementary character to determine the laws of behavior of the cables in connection with their important physical characteristics.
2. Manufacturers Represented
The cables to be described were submitted from the plants of the following manufacturers: The Broderick & Bascom Rope Co., St. Louis, Mo.; A. Leschen & Sons Rope Co., St. Louis, Mo.; Macomber & Whyte Rope Co., Chicago, Ill.; Hazard Manufacturing Co., Wilkes-Barre, Pa.; Wright Wire Co., Palmer, Mass.; Waterbury Co., New York, N. Y.; John A. Roebling's Sons Co., Trenton, N. J.; and American Steel & Wire Co., several plants.
It seemed important to treat the manufacturer as a variable of the investigation.
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