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 338
for the same work, is the Ingersoll-Sargeant channeller shown in Fig. 8. This has the advantage that thedrills can be inclined at any angle. The cut is made as a continuousslot some 1| to 2 inches in width, and of any desired depth up to 6 or8 feet. After the channelling machines have done their… … ig. 5.—Eclipse rock drill. 246 BUILDING AND ORNAMENTAL STONES OF NORTH CAROLINA. cutting is called gadding and is also done by machinery. Two 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…
Building stones · Quarries and quarrying
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