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
quired gears. Hence, we select any two gears in which one contains 238 LATHE, METAL-WORKING. twice as many teeth as the other; and as the thread to be cut is coarser than the feed-screw, it isobvious that the smaller of the two must be placed on the feed-screw, and the larger on the cone… … 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.…
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