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 251
revolving on the same spindle or axis. The object of this arrangement, Fig. 2586, is to obtain awider range of difference between the revolutions of the cone-spindle and the feed-screw than ispossible in a single-beared lathe, and thus to allow of the cutting of threads of finer or coarserpitches.… … ■r~rj\rj\i\rS Divide the pitch to be cut by the pitch of the feed-screw, and the product will be the proportionalnumber. Then multiply the number of teeth on the lathe-mandrel gear by the number of teeth onthe smallest gear of the compounded pair, and the product by the proportional number, and…
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