... 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 124
is gradually sunk to the desired depth. Thesize, weight, power, and design of channellers vary greatly with the characterof the rock on which they are intended to operate and on the angle from thevertical which the channel is to assume. It is needless to say that muchingenuity has been displayed by… … Sullivan Rock Drill mounted on adjustable tripod.
Building stones
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