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Summary Measurements of unconfined shear strengths were made over a range of moisture contents on seven remoulded agricultural soils which covered a range of textures, and these were used to calibrate the Swedish fall‐cone device. It was found that the calibration factor, usually regarded as constant in engineering literature, was dependent on soil texture, but constant over a range of moisture contents for a given soil texture. From the assumption that the liquid and plastic limits correspond to two fixed specified strengths, it is shown that one can use the fall‐cone device to determine these limits by making measurements of cone penetrations over a range of moisture contents. It is suggested that a modified plasticity chart, which can be obtained very simply from measurements of cone penetrations made over a restricted range of moisture contents, may be used for characterizing soil behaviour.
G. D. Towner (Sat,) studied this question.