Abstract
Modifications are described to the penetrometer originally designed by Chapman & Newell (1947) for the measurement of the resistance to penetration of marine soils.An account is given of qualitative and quantitative tests made during the study of the thixotropy and dilatancy of the muddy sand of theArenicolaregion of the shore at Whitstable. The results of tests made with the dilatancy viscometer originally used by Freundlich & Röder are shown not to be in clear agreement with the observed behaviour of the soil.

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