The structural and industrial materials of California (1906)
Aubury, Lewis E., 1862- · Sacramento, W. W. Shannon, Superintendent state printing · leaf 32
all of igneous rocks, mostly granite,with some basalt, etc. *The Knox blasting system (patent) consists of drilling an oval-shaped hole, elon-gated in the direction of the desired break, and putting in a small quantity of blackpowder, leaving an air space between the powder and the covering. The… … ILL. No. 2. RAYMOND GRANITE QUAUUY, MADERA CuLNTY.Showing use of quarry bar.
Building stones · Portland cement · Clay · Mines and mineral resources
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