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BS 2742:1969 Notes on the use of the Ringelmann and miniature smoke charts
standard by BSI Group, 12/31/1969
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Explains the purpose and method of use of these charts for the visual assessment of the darkness of smoke emitted from chimneys.Cross References:
BS 2742C
BS 2742M
Addendum No. 1 to BS 2742:1969
Replaces BS 2742:1958.