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 418
r end, after thesame manner as work is held in lathe-centres, c is a clamping device, whereby the dog or driverupon the work or mandrel may be held in a fixed position with regard to the spindle a. Upon thespindle a is fastened a worm-wheel d, engaging with a worm e, which is fixed to the shaft/,… … In Fig. 3007, h is an arm carrying an index-pin ?, which arm may be fastened upon / in such posi-tions as to bring the pin i opposite either of the rows of holes upon plate g. A spiral spring at jforces the point i into such of the holes in g as it may be opposite to. Upon the back side of plateg…
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