To Mr. Irving A. Stearns, mining engineer and former general superintendent of the Pennsylvania Railroad Co.'s Coal Department, we are indebted for the following summary of tests made by the mining engineers of this company. Although these tests were made 25 yr. ago, they are still of value as WEIGHT OF SUSQUEHANNA COAL CO.'S WHITE ASH ANTHRACITE giving the weight of anthracite, but the sizes corresponding to the different grades are not now in use. Sizes of anthracite should be taken from the table Sizes of Prepared Anthracite. These determinations showed an average value for the specific gravity of the coal from the various seams upon this company's property of 1.4784, together with an average weight per cubic foot of coal in the solid of 92.5 lb. Mr. Robert A. Quin, Manager Susquehanna Coal Co., has very kindly furnished the two following tables. The first shows the present (1914) sizes of anthracite, and the second shows the number of cubic feet per ton occupied by each of these sizes, according to the region in which it is mined. * This table is based on the average specific gravity of American coals. †The contents of the bituminous coal and lignite is given in tons of 2,000 lb.; the contents of anthracite seams, in tons of 2,240 lb. |