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 348
quarry the diamond drill mayoften be used to advantage, particularly in marble and sandstone beds.By means of this drill, cores can be obtained from any particular depthand an idea gained of the deep-lying material inaccessible by any naturalexposures. Care must, however, be taken to ascertain the… … Fig. 11.—Drill holes in strata showing how erroneous ideas a thickness of bed ac-cepted by boring, a, Horizontal strata; &, inclined strata ; c, vertical. obtained will give a very safe estimate of the thickness of the various beds,and the quality of the material. Where, however, the beds are…
Building stones · Quarries and quarrying
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