US Patent Number
An apparatus for conducting resonant footing tests upon undisturbed soils includes an oscillatable mechanical structure with attachable electrical means for causing both oscillation of the structure and measurement of the behavior of the soil under test. The apparatus is transportable to the site at which the test is conducted on soil in-situ, and is adapted to be employed under selective loadings applied downwardly upon the oscillatable structure.
University of Kentucky Research Foundation, Lexington, Ky.
Hardin, Bobby O. and Thurman, Woodrow W., "Resonant Footing Test Apparatus" (1974). Civil Engineering Faculty Patents. Paper 7.