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 234
Fig. 2.—Diagrams illustrating method of cleaving granite by means of compressedair. B, lift or drill hole; BC, area cleared by powder; AFF, area cleaved by com-pressed air ; DE, thin edge on down-hill side of quarry where air escaped. means of a globe valve to an air pipe line from an air…
Building stones · Quarries and quarrying
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