... 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 360
lbs. A duplicate failed at 950 lbs.; modulus of rupture 10,000jbs. A beam 12 in. long and 1 in. square failed at 558 lbs. Deflection with pressure at 690 lbs. was 0.7 in. No. 763.—This is the same slate as No. 762 but it is marred by thepresence of worms which consist of lineal or curved inclusions… … Melbourne slate. Jointing in New Rockland quarry, 239 Carbonate of lime is also present in places. The worms detract from thesmoothness of the surface but they do not seriously interfere with the useof the slate for roofing purposes, except when accompanied by pyrite. The large pit described above…
Building stones
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