抄録
The sedimentation velocity of a particle is in proportion to the square of the partical size. Therefore, the particle size distribution can be determined from the changes of concentration with the depths of the suspension at the time selected according to the sample. In this instrument, the concentration gradient with depth is measured by means of specific gravity balance, and the cumu-lative curve of the particle size distribution is automatically recorded as the detection of the change of buoyancy with the square root of the depth that is in proportion to the particle size. The measurement is rapid, simple and reproducible. A few samples were measured, the results agreeing with those obtained by other methods. (Received Jun. 2, 1964)
