... Report on the building and ornamental stones of Canada, vol. I-V (1912)
Parks, W. A. (William Arthur), 1868-1936, Canada. Mines Branch · Ottawa : Government printing bureau · leaf 134
nds of the cylinder of the cutting engine. The air is therefore notexhausted but travels between pulsator and engine in a closed circuit. Manyof these machines have been installed in some of the largest marble quarriesin the United States and are said to have a greater efficiency per unit of… … w w o 87 The Gang Saw. The gang saw frame consists of four upright posts of wood or preferablyof structural steel, securely bolted to the foundation and strengthened bythe necessary side pieces and braces. The space inside the four posts isoccupied by a hopper shaped depression in the floor. From…
Building stones
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