Description: Report issued by the U.S. Bureau of Mines discussing the Ringelmann Smoke Chart. As stated in the summary, "the Ringelmann Smoke Chart fulfills an important need in smoke abatement work and certain problems in the combustion of fuels. A knowledge of its history and methods of preparation is, therefore, of interest to many" (p. 1). This report tables, and an illustration.
Date: August 1955
Creator: Kudlich, Rudolf H. & Burdick, L. R.
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