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 491
and L are slotted heads ; K is a combination top-screw head ; M is a side head; N is a three-wingmatcher; O is a two-wing matcher; P is a jointing head; Q is a beading head; R is a cope-head ; andSis a patent grooving head. Matching heads are made usually with two or three wings as shown.Slotted…
Mechanical engineering -- Dictionaries
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