W. C. L. Hemeon to O. H. Cilley on Dust Control at the Manheim Plant (1954)

A three-page letter of June 17, 1954, from W. C. L. Hemeon, engineering director of the Industrial Hygiene Foundation of America, to O. H. Cilley, general manager of Raybestos-Manhattan's United States Asbestos Division at Manheim, Pennsylvania, summarizing their June 10 conference. Hemeon wrote that dust control over "the past fifteen years or more" had removed most of the obvious sources, and proposed enclosing machines to measure exactly how much dust each part still gave off, starting with the twisters, which state measurements suggested made "very much less dust" when replaced by speeders. He also proposed an exhaust hood over the blending bed and training a laboratory man to take dust counts.

What it shows

Hemeon wrote that with dust reduced "for the most part, to levels of two and three million" particles per cubic foot, American dust counts "now have but limited value because of the lack of criteria for their interpretation." He suggested comparing the plant with the English plant of Turner Brothers, using the English counting methods. The letter answers Cilley's request for an engineer (Cilley to Hemeon, May 28, 1954) and shows the dust levels at a large American asbestos textile plant in 1954.

In Johns-Manville's index

Johns-Manville's legal department indexed the Motley 1,000 in 1984. Its index describes this document as follows:

W.C. Hemeon (Engineering Director, IHF) letter to O. H. Cilley, 6/17/54, summarizing discussions at Cilley's office on 6/10. Discusses the dust condition at R-M's Manheim plant and Hemeon's ideas on effective dust control. Also discusses the plan to train a man, now on the laboratory staff, to perform dust counts and analysis.

Related documents

• O. H. Cilley to W. C. Hemeon on Dust Control and a Lower Dust Limit (1954)

About this copy

This is document 331 of the Motley 1,000, from the set the Manville Personal Injury Settlement Trust's records facility certified as true copies, pages CRMC-Motley1000-Subj-001648 to CRMC-Motley1000-Subj-001650.