Letter | Published:

A Sedimentation Phenomenon

Nature volume 160, pages 2627 (05 July 1947) | Download Citation

Subjects

Abstract

One of us (F. S.) was required some time ago to consider a proposed sedimentation apparatus for particle-size analysis, in which, for reasons beyond the scope of this note, the sedimentation vessel was to be a conical flask. Assuming the motion of each particle to be one of vertical descent, it was shown that an unstable condition would ensue. Suppose time has elapsed for particles of a specified size to fall from AB to A′B′. At this moment, no particle greater than the specified size will be above the surface C′ A′ B′ D′, and the suspension within this region will have a higher specific gravity than the remainder. It was clear, therefore, that some flow of the suspension must occur and that the use of a conical flask would introduce an additional complication into the already difficult problem of particle size analysis.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

Author information

Affiliations

  1. British Pottery Research Association, Penkhull, Stoke-on-Trent. April 9.

    • R. JOHNSON
    •  & F. SMITHSON

Authors

  1. Search for R. JOHNSON in:

  2. Search for F. SMITHSON in:

About this article

Publication history

Published

DOI

https://doi.org/10.1038/160026b0

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.