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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 438

An illustration from Appletons' cyclopaedia of applied mechanics: a dictionary of mechanical engineering and the mechanical arts, 1880, leaf 438 — roducing air be-tween the grinding surfaces of the burrs, to keep the chop cool and prevent injurious heating. Theventilation can be accomplished by forcing in or sucking out the air between the grinding surfaceswith the help of a forcing or exhaust ventilator; or channels may be employed in the… … 420 MILLSTONES. lastly, it is sought to introduce the necessary quantity of air by means of pretty deep furrows on theface of the burr. The short furrows also serve this purpose in part, and are rightly called air-furrows.The quantity of flour produced is said to be largely increased by…

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