Steam power plants, their design and construction . the quality of the coalfrom the same mine would be greatest with the Western coals,less with the Pennsylvania bituminous, and least with the semi-bituminous group. The anthracite, particularly the small sizes,might vary considerably on account of an abnormal amount ofimpurities present in the coal. The figures given in the table canbe exceeded when all the conditions are favorable. Relative Value of Steam Coals. p, d oj^_> c3 rt fl a> o ?*-> Kind of coal. S ?3§S-bl- °-l ^ = SI Ssflssi §-g is Pocahontas, W. Va.* 100 15 45 Youghiog
Steam power plants, their design and construction . the quality of the coalfrom the same mine would be greatest with the Western coals,less with the Pennsylvania bituminous, and least with the semi-bituminous group. The anthracite, particularly the small sizes,might vary considerably on account of an abnormal amount ofimpurities present in the coal. The figures given in the table canbe exceeded when all the conditions are favorable. Relative Value of Steam Coals. p, d oj^_> c3 rt fl a> o ?*-> Kind of coal. S ?3§S-bl- °-l ^ = SI Ssflssi §-g is Pocahontas, W. Va.* 100 15 45 Youghiogheny, 17 48 Hocking Valley, Ot 80 18 45 Big Muddy, 80 20 50 MtOlive. 20 45 broken 87 15 35 r>ackawanna. No. 1. buckwheat 73 13 32 Lackawanna. Pa .t rice 63 12 30 *Semi-bitumincus ; tBituminous ; JAnthracite. The table also shows about the amount of coal which shouldbe burned per square foot of grate per hour under ordinary con- J ^1 I I Ill : .4/1 «a</ i. Il\R-irORL> AND bPRINCriEID STREET RAILW \\ COMPAN\E H KITFIELD ENGINEER STEAM POWER PLANTS. 19 ditions; also, the ratio of heating to grate surface necessary forthe boiler to develop its rated capacity when burning about theamount of coal stated and when each pound of coal is evaporatingthe quantities of water given in the table. Some authorities ofconsiderable experience with Illinois coals advise higher rates ofcombustion than are recommended in the table for the best grate proportioned in accordance with the data given caneasily be reduced in size if found desirable. It is proposed to pro-vide sufficient draft, that equivalent to the pressure of inch ofwater, to run easily a boiler proportioned according to the datagiven in the table at one-third over its rating. Five-tenths of aninch of draft might not be sufficient with the rice size of anthra-cite, if it is of poor quality, to enable a boiler proportioned ac-cordin
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