. Bulletin. difference that the ash represents a residue tobe handled by the householder, and it contributes to his con-venience to have as little as possible present in the coal. With regard to the B. t. u. values, the table shows that thereare important and distinguishable differences in the heating qualityof the different coals found in the three states, yet the amount ofdifference is not sufficient to justify extravagant statements in praiseof certain coals or in disparagement of others. On the heat basisalone, the difference between the value of the poorest and that of thebest coals, as t
. Bulletin. difference that the ash represents a residue tobe handled by the householder, and it contributes to his con-venience to have as little as possible present in the coal. With regard to the B. t. u. values, the table shows that thereare important and distinguishable differences in the heating qualityof the different coals found in the three states, yet the amount ofdifference is not sufficient to justify extravagant statements in praiseof certain coals or in disparagement of others. On the heat basisalone, the difference between the value of the poorest and that of thebest coals, as they are found in the mine, amounts to about one-fifth ?Comprehensive tables covering the analytical values for Illinois coals are containedin Bulletin 29 of the State Geological Survey, Urbana, 111., entitled Purchase and Saleof Illinois Coal under Specifications by S. W. Parr, and in Bulletin 3 of the IllinoisCoal Mining Investigations, Urbana, 111., entitled Chemical Study of Illinois Coals byS. W. Coal Fields of ? and Western Kentucky x-V^ \\ . t £ Districts for Classification of AS \v Coals in Illinois w- ?.-\ 1. Longwall district: No. 2 coal ™ (Third Vein) 2. Jackson County district: No. 2 v. coal (Murphysboro coal) 9 ^ 3. Rock Island and Mercer coun- J *%S@Jj}M^! ties: No. 1 coal ftCfoSi J? >. aft R*fiS3* 4. Peoria-Springfield district: No. 5 coal (Central Illinois coal) f^V . jX 5. Saline and Gallatin counties: No. 5 coal (Harrisburg coal) .•-??****»*:—a»- 6. Franklin, Williamson, and Jefferson counties: No. 6 coal (.Franklin-Williamson coal) 7. Southwestern Illinois: No. 6 coal S. Danville district: No. 6 and No. 7 coal (Grape Creek and Danville coals)(Note: The districts as indicated in this list were arranged for convenience of classificationtXSON ; of the coals by the Illinois Coal Mining Investigations; they do not correspond to the|jiMine Inspectors districts nor to the trade subdivisions.)
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectenginee, bookyear1904
