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A dynamic cone penetrometer for measuring soil penetration resistance

^a USDA-ARS Jornada Exp. Range, MSC 3JER, Las Cruces, NM 88003-0003
^b Dep. of Agronomy and Horticulture, New Mexico State Univ., Box 30001, Dep. 3Q, Las Cruces, NM 88003-0003

View larger version (23K): [in a new window]   Fig. 1. Impact penetrometer design. All dimensions are in inches [cm]. Steel was used for all parts except for the bubble level mount, which is a polyvinyl chloride tube. The striker plate should be welded to the center of a single rod, or to the bottom half of a two-piece rod. The top half is then threaded. Cone is cut from steel on a lathe, then hardened. Penetrometer can be shortened for transport by threading bottom end of top section of shaft into striker plate.