Ringelmann scale
Sign in to savescale for measuring the opacity of smoke
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- Sensing change-ringelmann smoke charts.jpg
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Paris
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International Standard Book Number
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smoke
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digital object identifier
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Q180686
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bibcode
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United States Geological Survey
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New Zealand national rugby union team
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particulates
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Q22908627
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opacity
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William Kent
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American Society of Mechanical Engineers
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Max Ringelmann
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Bryan Donkin
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Engineering News-Record
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British Standards
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