Permissible Electric Mine Lamps (Supplement to Bulletin 332)
Description:
Report issued by the U.S. Bureau of Mines on the improvements made on permissible electric mine lamps. The types of electric lamps approved for use, and their characteristics are presented. This report includes tables.
Date:
June 1936
Creator:
Ilsley, L. C. & Hooker, A. B.
Partner:
UNT Libraries Government Documents Department