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 280
tice to use a chaser, that is, a screw-cutting tool having several teeth. The disadvantageof this system is that the chaser must be cut from a hob, and if the hob is cut of the correct pitch itis liable to become of incorrect pitch in the hardening process, because the steel usually increases… … 270S.
Mechanical engineering -- Dictionaries
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