Summary Two new forms of pressure‐membrane apparatus are described. One has been developed for routine use, while the other has been used for pressure‐membrane tests at very high pressures (up to 1,500 atmospheres, or pF 6·2). For soil in both the wetting and drying condition it is shown that the relation between suction and moisture content determined by pressure‐membrane tests agrees with that obtained using the suction plate, the centrifuge, the vacuum desiccator, and the sorption balance. The rate of attainment of moisture equilibrium in the pressure membrane is also examined experimentally, for a very wide range of air pressures.
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Coleman et al. (1961) studied this question.
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