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 434
d is rotated within aninclosing cylinder, the ends of which are closed. The material to be ground is introduced betweenthe two cylinders, and is pulverized by the action of the bullets. It will easily be seen that as thebullets are placed in spirals, there is no point of the interior of the…
Mechanical engineering -- Dictionaries
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