aia i ; 
Review of Prof. Johnson’s Report on American Coals. 333 
The following classified view of twenty five varieties of coal 
has been derived from the table of ranks above mentioned, and 
may serve to indicate the practical value for steam navigation of 
the several classes. 
? 
53 (36 ee Eee ae 
2 = a= jos p Gye = 
ny of Names of samples. Stas Soils he? 128 = 
iat PRslhs.| ERPS slnss Se oe 
Sss|ps8| $8 SS 2lSsb S288 
4 SL SLT ee OS. ily 2 
Cumber- |Atkinson & Templeman’s, - - | 1000] 1000] 282 |) 828) 505 {3615 
land, (Md.)/Easby’s coal in store, - “ - 936 | 946) 451 | 658) 286 | 3277 
Free burn-|Easby & Smith’s, - 931] 903) 197! 886] 329 {3246 
ing, bitu-/New York and Ma. ae Co i 914) 927) 111 | 677| °376 43005 
minous. |Neff’s, - - 882 | 906 133 | 877} 298 {| 3096 
Averages, - - - - 932 | 936 | 235} 785! 359 13248 
Beaver Meadow, slope 5, — - | 923° 982) 1000) 722, 207 43834 
Anthra- | Forest Improvement, (Schuyliill,) 940| 955} 741] 790} 150 
cites of |Peach Mountain, Sy Jee ss 945| 964] 198) 901| 142 4} 3150 
Pennsyl- |Lackawana, - - - | 915] 844) 484] 779} 187 4} 3209 
vania. Lehigh, - - - - = | 885] 872} 555) 792) 153 | 3207 
Averages, -  - - = | 911] 923175951 797] 168 13395 
Free burn-|Quin’s Run, - =) na a een O() Oleviy 
908 | 911] 176| 996! 595 
i 3586 
- | 873) 835! 171) 766| 602 
3287 
3012 
2885 
3299 
3137 
2856 
2885 
ing bitu- |Blossburg, -  - le 
minous Dauphin and Susquehanna, - 
coals of |Cambria County, - - 863 | 860} 172) 867) 250 
Pennsyl- {Lycoming Creek, - —- 833 | 871| 184] 706! 291 
yaar Averages, - - -__-_| 887! 878! 232 sor ai 
Chesterfield Mining Company - 841) 726) 143) 1000) 427 
Highly bi-|Midlothian, screened, - = 836 | 722} 180) 730) 388 
tuminous |Creek Company’s, - - - 787 | 692) 136) 981} 299 
960 | 913) 453) ah: 
coals of | |Crouch & Snead’s, - : 779 | 786) 112) 635) 431 | 2743 
Virginia. |Tippecanoe, - - - - 724} 618) 149) 875 | 376 | 2742 
Averages, - - -  - | 7931 709| 144| 844| 384 2872 
Newcastle, Eng., - | 809] 776 91; B27, 595 , 3198 
Foreign _|Pictou, (Cunard’s sample, ) N. S., 792) 738; 97| 928] 588 § 3143 
bitumin- |Sidney, N.S., 5 e. 747\ 669! 276] 764] 424 § 2880 
ous coals. |Liverpool, Eng, -  - - - 733 | 663) 323) 857) 581 4 3167 
\Scotch, . - - - - - 649 | 625| 107) 847 o21 2749 
Averages, -  -  - — - | 746 | 6941 1971 844| 526 13027 
General |Maryland free burning coals, - { 1000) 1000, 395) 880) 682 
scale ofrel-| Pennsylvania anthracites, — - -' | 977 | 986; 1000} 893] 319 
ative val-|Pennsylvania free burning bitu- | 
uesformed| minous,  - : = 2 = 951} 938; 390}1000| 914 
from the |Virginia bituminous, - - - | 850) 757| 242) 943) 730 
averagesof/Foreign bituminous, = - - - 801 | 741| 331) 948} 1000 
| | 
leach class.| 
From the above scale it appears that in evaporative power under 
equal weights, the Cumberland class surpasses the anthracites by 
about 2°3 per cent., and under equal bulks, by 1-4 per cent. They 
also surpass the foreign bituminous coals 20 per cent. when we 
compare equal weights, and 26 per cent. by equal bulks. In 
freedom from clinker the anthracites stand preéminent ; in rapid 
production of steam, when once in action, the Pennsylvania bitu- 
Vol. xutrx, No. 2.—July—Sept. 1845. 43 
