Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 591
triangular file, applied very obliquely as to horizontalangle, as at /(, sometimes exceeding 45 degrees, but without vertical inclination, as at v; and the face?of the teeth are nearly upright, as in the hand-saw. The large sides of the teeth are very keen, and eachvertical edge is acute like a… … ployed in sharpening gullet or briar-teeth ; in these there are large curvili-near hollows, in the formation of whichthe faces of the teeth also become hol-lowed so as to make the projectingangles acute. The gullets 3, 7, arefirst filed, and from the file crossing thetooth very obliquely, as at to…
Mechanical engineering
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