Document qd1zvbgGgDQ27KZ867Qz52zNG

FILE NAME: Metropolitan Life (ML) DATE: 1934 Feb 13 DOC#: ML120 DOCUMENT DESCRIPTION: Excerpt from Dr. Lanza RE US Public Health Service Standard RE Silicosis in Granite Workers & Safety Threshold Date: 2/13/34 Title: Letter Author: Lanza Receiver: Thomas, J.F. Comments: ""The United States Public Health Service set up a standard in a bulletin dealing with silicosis among the granite workers in Barre of ten million particles per cubic foot as the threshold of safety. This standard referred specifically to that one indsutry and cannot be construed as to mean that five million particles would be the threshold if the dust contained 70% of free silica instead of 35% which was the case at Barre as I remember it.*"