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 707
al plan of holding the drill-shank is by means of friction induced by bolts, the latternot being forced directly against the shank. The Z-bit is considered the best form theoretically forcutting, for the greater part of the cutting edge is around the circumference of the hole, where most of the…
Mechanical engineering -- Dictionaries
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