Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts (1880)
D. Appleton and Company, Benjamin, Park, 1849-1922 · New York, D. Appleton · leaf 409
eing the highest, the middlings move gradually toward the lower or discharging end; and asthe finest cloth is placed at the head, the finest portion of the specks are taken out at the first sectionby alight draught of air, while the purified fine middlings are sifted through; coarser and…
Mechanical engineering -- Dictionaries
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