The building and ornamental stones of North Carolina (1906)
Watson, Thomas L. (Thomas Leonard), 1871-1924, Laney, Francis Baker, 1875-1938, Merrill, George P. (George Perkins), 1854-1929 · Raleigh, [N.C.] : E.M. Uzzell, Public Printer · leaf 339
o typesof gadding machines are in common use, the one a diamond drill whichbores a hole, and the other an impact drill which drives the hole in theordinary manner. One of these, a special adaptation of the channellingmachine, is used for the same purpose, shown in Fig. 9. It will be seenat once… … Fig. 6.—Ingersoll-Sergeant quarry bar drill. conditions, must be used, recourse is had to the Knox or some similaimethod of blasting in which direction is given to the force of the ex-plosion. Freed from the quarry bed, the stone is reduced to the required sizeand shape by means of hand implements…
Building stones · Quarries and quarrying
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