The structural and industrial materials of California (1906)
Aubury, Lewis E., 1862- · Sacramento, W. W. Shannon, Superintendent state printing · leaf 137
DK A TK 9—BUL. 38 (^-■ 130 STRrCTrRAL AXD INDUSTRIAL .MATf:RIALS OF CALIFORNIA. Tlie blocks that form the San Pedro breakwater are broken down Ijychurn-drilling (three men to the drill) rows of holes, having an averagedepth of 25 feet, with 20 feet face, and blasting with black powder, tamp-ing… … ILL. Xn. i;i>. CJLVISWOKTII PARK SAXD.-^TOXl-: lirAKRV. Los AXciKLES COIXTV. pounds; 20 per cent is Ijlocks from 1000 to 4000 pounds; and 45 percent large blocks over 4000 pounds. (See sketch of front elevation of(juarry.) The (juarry is e(|uipped with four steam derricks, using oil as fuel.
Building stones · Portland cement · Clay · Mines and mineral resources
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