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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1915 Excerpt:...British thermal unit determinations 1 on airdried samples of Rhode Island coal is 9,908. If sample 9330, which is labeled as "weathered," is left out of account the average is 10,068. It may therefore be taken as a fair assumption that, on the air-dried basis, Rhode Island coal has a value of 10,000 British thermal units. On this basis it may be noted that thoroughly dried Rhode Island coal has theoretically about 75 per cent of the heating power of anthracite coal and about 70 per cent of the heating power of the high-grade bituminous coals that are brought into New England.. The analyses of Rhode Island coal given above are from samples of beds that are mined for coal and, as a rule, are from the better parts of these beds. The carbonaceous matter of the coal measures of Rhode Island grades from the best of these samples to carbonaceous i Bur. Mines Bull. 22, pt. 1, pp. 184-185,1913. shale containing only a very small percentage of carbonaceous matter. As already explained, where the beds have been squeezed thin, the coal has generally been changed to graphite and is accompanied by a high percentage of ash, which consists mainly of quartz, apparently deposited by water carrying silica in solution. No analyses of properly averaged samples of the more graphitic portions of the coal beds are at hand. The following analyses, however, of samples from Fenners Ledge, at Arlington, will give a fair idea of the composition of the graphite beds: Analyses of graphite of Fenners Ledge, at Cranston,R. I." a Preliminary report of the Natural Resources Survey ol Rhode Island: Rhode Island Bur. Industrial Statistics Bull. 1 (Ann. Rept. 1909, pt. 3), p. 115, 1910. Furnished by G. L. Gross. 1. By Prof. Sharpies, of Boston. 2. By State Assayer Perkins, of Rho...