One of the mysteries of the English language finally explained.
Used attributive and (now rare) in the genitive with reference to a method of estimating the darkness and density of smoke by visual comparison with a chart bearing different shades of grey (formed by lines ruled with different spacings or different thicknesses); especially in "Ringelmann chart".
Late 19th century. From the name of Maximilien Ringelmann, French professor of agricultural engineering, who devised the method.
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