A Cartesian hydrometer and its application to sedimentation analysis

The hydrometer described is particularly suited to sedimentation analysis. It consists of a Perspex framework covered by a thin rubber diaphragm. Manometer readings obtained are sensitive to 0.000 15 specific gravity units and the hydrometer can be adjusted to cover various ranges. Results for particle size analysis of six soils show better agreement with the standard pipette sampling method than those obtained using the Bouyoucos hydrometer.