Appleton's dictionary of machines, mechanics, engine-work, and engineering (1869)
New York, Appleton · leaf 612
but that for the larger spin! v. ill 1, ■ obs< rve 1 from the face view of it given in Fig. S287. This consists of a strong plate W, annularis recessed to n ceive a ring X, flushwith its exterior surface. Th • ring X has a portion <>f its circumference cut. into teeth to geer with aworm… … will be corresponding] md will, by change the relation of the cutters f//,ian- of the chuck. For this purpose, three spiral i r g are formed on the u circus ends of the cutters project and abut against tho inner edges of th thai if the i > pa thro !
Mechanical engineering
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