Publisher's Synopsis
Excerpt from Weathering of the Pittsburgh Coal Bed, at the Experimental Mine, Near Bruceton, Pa
The chemical analyses Show that changes in composition have occurred in the coal for a distance of about 50 feet from the outcrop. The analytical data serve as a basis for certain deductions as to the nature of these changes. Several points of similarity become evident between weathered coal of this character and the Cretaceous coals and lignites. On the other hand, certain dissimilar properties of the two render it altogether doubtful whether a true metamorphosis or reversion of the bituminous coal to the lignitic type could ever take place through the agency of weathering. The analyses also Show that the composition and heating value of the unweathered coal, computed on the moisture and ash free basis, are fairly constant.
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