Ringelmann chart

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Ringelmann chart [′riŋ·gəl‚män ‚chärt]

(engineering)

A chart used in making subjective estimates of the amount of solid matter emitted by smoke stacks; the observer compares the grayness of the smoke with a series of shade diagrams formed by horizontal and vertical black lines on a white background.

Ringelmann chart

A chart used as the basis for evaluating the density of smoke discharged from chimneys.

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