Abstract
Apparatus has been developed at the Road Research Laboratory which enables vibrations in the range 40 to 60,000 c/s to be propagated along the surface of soil or road constructions. The purpose of the present paper is to interpret the results in terms of the elastic properties and, where possible, the thickness of the Construction. So far, most of the work has been limited to experimental constructions, and the relevant data concerning thicknesses and types of material have therefore been available from laboratory records and experiments have also been made to determine the elastic properties of the materials.

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