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The following notes are restricted to a description of several vibratory test techniques which have been used somewhat successfully to determine certain dynamic characteristics of soils in situ.
Only a few periodic and nonperiodic force exciters as well as typical surface and subsurface instruments to measure displacement, pressure, and shear are described.
The difficulties encountered in the field when using this or similar equipment and the assumptions to circumnavigate some of them are outlined.
For the theoretical background the reader is referred to the other papers in this STP and the appended literature index.
Consultant and Professional Engineer, Princeton, N. J.