A Caltech Library Service

New apparatus for determination of size distribution of particles in fine powders

Knapp, Robert T. (1934) New apparatus for determination of size distribution of particles in fine powders. Industrial and Engineering Chemistry Analytical Edition, 6 (1). pp. 66-71.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


Every year a greater need for accurate analysis of the size distribution of subsieve material is being felt by the engineer, because of the increasingly vital part it plays in the manufacture of cement, pigments, and other powdered products. Sieves are a satisfactory means of obtaining this information as long as the material is relatively coarse, but when from 70 to 95 per cent of the sample passes the 200-mesh screen (the finest one giving consistent reading), some new scheme of analysis must be used. Several methods of analyzing this fine fraction have been developed. For example, Professor Work at Columbia has perfected an excellent microscope technic. Elutriation and sedimentation methods employing various fluid media have been shown to be feasible, and additional methods are constantly being developed, but most of them are slow and tedious.

Item Type:Article
Related URLs:
URLURL TypeDescription
Additional Information:Copyright © 1934 American Chemical Society. Received September 19, 1933. Presented at the Applied Mechanics Meeting, American Society of Mechanical Engineers, Pasadena, Calif., January, 1933. The writer wishes to acknowledge the whole-hearted support given by John Treanor, president of the Riverside Cement Company, and by Hubert Woods, director of the Research Department of the same company, for which this work was undertaken. Albert E. Myers assisted greatly during the early stages of development. Emory L. Ellis operated the instrument for many months, completing several thousand analyses, and put it on a producing basis. Howard Starke, who has had complete charge of the instrument for the past three years, has contributed many improvements in construction and operating technic which have decreased the labor required while increasing the speed and reliability.
Funding AgencyGrant Number
Riverside Cement CompanyUNSPECIFIED
Record Number:CaltechAUTHORS:20140826-111946948
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48912
Deposited By: Kristin Buxton
Deposited On:26 Aug 2014 19:37
Last Modified:26 Aug 2014 19:37

Repository Staff Only: item control page