Appleton's dictionary of machines, mechanics, engine-work, and engineering (1861)
Appleton, firm, publishers, New York. (1852, D. Appleton & Co.) · New York : D. Appleton · leaf 184
or it would soon cease todeserve its appellation of half-round bit: some indeed give it about one-thirtieth more of the circum-ference. It is generally made very slightly smaller behind, to lessen the friction; and the angle, notintended to cut, is a little blunted half-way round the curve, that if…
Mechanical engineering
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