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Fig. 8, from “C” coal seam

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Fig. 8 – X-Ray photograph of a piece of coal taken from “C” coal seam, Lynch, Harlan County, Virginia.
(cropped from border; levels 20 1.00 255; color levels/shadows -20 0 +20)
ex Edward O’Toole. “Dry cleaning of coal by means of tables.” Year Book of the American Iron and Steel Institute 1921 (1922) : 203-234 (comments 232-234)
Harvard copy, digitized June 30, 2008
 

23 July 2016
tags: E. O'Toole; abstraction; coal; skiagraphy; tables