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The time element is frequently an important consideration in the practice of foundation engineering. Where the foundation soils are irregularly bedded and variable in character, many tests are needed, and the direct shear testing machine becomes a valuable tool for the determination of the variations in soil strength, because of the speed with which tests can be made. In order to insure accuracy, it is important that the design of the testing machine and the method of test be definitely established. It is urged that the development of such a standard be undertaken by the American Society for Testing Materials.
Converse, Frederick J.
Professor of Soil Mechanics, California Institute of Technology, Pasadena, Calif.