NASA NTRS · 19730023589
Soil penetrometer
Abstract
An auger-type soil penetrometer for burrowing into soil formations is described. The auger, while initially moving along a predetermined path, may deviate from the path when encountering an obstruction in the soil. Alterations and modifications may be made in the structure so that it may be used for other purposes.
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Howard, E. A., Hotz, G. M., Bryson, R. P.. 1968-04-23. Soil penetrometer. https://ntrs.nasa.gov/citations/19730023589
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