... 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 120
oo o QJ Plate VIII. Telescope Feed Hammer Drill. X … 0H PU 83 Companys quarry near Bancroft, the manager prefers a single bitted drilland uses a 2 inch starter with the heavy machines, and a If inch starterwith the light machines. At the North Lanark marble quarries a 2^ inch+ shaped bit is used with the heavier machines, and a If inch bit for plug…
Building stones
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