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Report on the building and ornamental stones of Canada (1912)

Parks, William A. (William Arthur), 1868-1936, Canada. Mines Branch (1901-1936) · Ottawa : Dept. of Mines, Mines Branch · leaf 164

An illustration from Report on the building and ornamental stones of Canada, 1912, leaf 164
a cS £ XX … = oi=5 — 5 O? •aO 11 101 feet of chiuiiiel in a diiy of 10 lioui-.s. They strike 290 blows a minute, cut{ inch deep, and travel forward f inch between strokes. Inp;ersoll-Randdrills are employed for the most part, each drill being actuated by air froma small electrically diiven compressor by the…

Building stones · Geology, Economic · Stone industry and trade

Internet Archive · University of Toronto, Robarts Library · Public Domain Mark 1.0. Free to use for anything.

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