| 摘要 |
An apparatus for measuring particle-size distribution which is constructed by arranging a measuring cell or cells in vertical direction, i.e. their longitudinal directions in alignment with the direction of the gravity, or mounting a measuring cell or cells on a rotor rotatable in a horizontal plane so that their longitudinal directions are in alignment with the radial directions as that of centrifugal force; inserting tips of a couple of pressure transmitting tubes having lengths different between them into each of said measuring cells; and securing base ends of said pressure transmitting tubes to a pressure-detecting unit. To operate this apparatus, a suspension of a powder to be measured is introduced into said measuring cell, particles of suspension in the measuring cell is made to settle by the gravity or a centrifugal force, the amount of powder between the tips of pressure transmitting tubes of said couple is determined by measuring the pressure difference between said tips, and the particle-size distribution is determined on the basis of the obtained amount of powder and a particle size calculated by Stokes' law from the settling time elapsed.
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