The structural and industrial materials of California (1906)
Aubury, Lewis E., 1862- · Sacramento, W. W. Shannon, Superintendent state printing · leaf 38
ing system, which leavesan even surface. The thickest layer exposed is about 25 feet thick, butmost of that part quarried is much thinner, from 4 to 10 feet. As thequarry opening is carried deeper the succeeding layers will probablybecome thicker, that is, the joints will be farther and farther… … (31) 32 STRUCTURAL AND INDUSTRIAL, MATERIALS OF CALIFORNIA. sions by plugs and feathers, they are taken to the cutting sheds, wherethey are handled by steam-power overhead traveling cranes, andthe surfaces are finished, either tool-dressed, rock-faced, or polished, asis desired, by hand or machine.…
Building stones · Portland cement · Clay · Mines and mineral resources
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