Appleton's dictionary of machines, mechanics, engine-work, and engineering : illustrated with four thousand engravings on wood ; in two volumes (1873)
D. Appleton and Company · New York : D. Appleton and Co. · leaf 640
files require the teeth to be somewhat finer towards the point, to avoidthe risk of the blank being weakened or broken in the act of its being cut, which might occur if asmuch force were used in cutting the teeth at the point of the file, as in those at its central and strongerpart. Eight courses… … file. There are various objections to employing chisels with concave edges, and therefore in cuttinground and half-round files the ordinary straight chisel is used and applied as a tangent to the curve.It will be found that in a smooth half-round file one inch in width, that about twenty courses…
Mechanical engineering · Mechanics · Engineering
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