A static-dynamic penetrometer consists of a cone tip secured to the end of one or more coupled rods and is attached to the lower end of a conventional drill rig assembly and is applied initially in a manner similar to that of the Standard Penetration Test (ASTM:D 1586). A load cell component containing an internaly gauged strain stud is then installed in series at the drill head so that the total applied load can be read on an electric readout device such as an electric analog load-indicator. The necessary reaction for "quasi-static" or "static" loads is supplied by the drill rig. Skin fraction may be measured statically and quasi-statically by withdrawal procedures and this and point bearing loads may be estimated from the data thus obtained.
