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 726
acute or keen, that they may act as knives in dividing the fibres transversely. The left sides of eachalternate tooth are first filed with the horizontal angle denoted by /;, and then the opposite sides ofthe same teeth with the reverse inclination, or A. Fig. 3725 may be considered to refer…
Mechanical engineering -- Dictionaries
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