A comparison of the Smokescope and the Ringelmann chart

Author: Burdick, L. R.
Additional Authors: Ringelmann, Max,
Year: 1955
Document Type: BMRA
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines
SUDOC: I 28.23:5162
Series: Report of investigations / United States Department of the Interior, Bureau of Mines ;
Report Number: 5162
Subject: Smoke prevention
Link: https://hdl.handle.net/2027/mdp.39015078540781

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