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 713
lower end of the feed-shaft,to the top of which a gear is feathered, fittingto the upper gear on the screw-shaft, which hasone or more teeth less than the upper gear onthe feed-shaft, whereby a differential feed is pro-duced. This frictional gear is attached to thebottom of the feed-shaft by a… … tubing,To the ROCK-DRILLS. 683 lower end of this tubular boring-rod the bit is screwed, and to the upper end a water-swivel, to whichconnection is made with the steam-pump, as shown in the illustration. By means of this pump aconstant stream of water is forced down through the hollow drill-rod,…
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