78 



used as lumber, amounting to 11,053,560 board feet, for mine cars and 

 construction purposes. 



The consumption of wood per ton of coal mined, was : 

 For all purposes, including lumber .269 cubic feet. 

 For mine-timbering, excluding lumber and mine cars, .2-16 cubic 

 feet. 

 The forms in which this wood is used, and the quantity of each are 

 shown in the following table. 



Wood consumed in Coal-mining in Ilunois * 



The total consumption for the state was obtained by mtiltiplying 

 the average consumption per ton, .246 cubic feet, by 80.121.9-18 tons and 

 adding to this total the lumber used in mine cars, which gave an average 

 total per ton of .269 cubic feet. 



By applying the distribution per cents already obtained to the total 

 of wood consumed, the total of each class was foiuid, and this was in 

 turn converted into the number of pieces in the class by applying the 



• The data were from two sources, those collected by R. B. MiUer on 16.642.160 

 tons of coal, and those by H. E. TufCt. of the V. S. Bureau of ^Unes. on 5.504.624 

 tons. The lumber required for mine-car construction was not included in their figures 

 and has been added. 



Amount of wood CfMi. ft.) regtiired per tow of coal. 



Tufft 5.504.624 tons 847.644 154 cu. ft. per ton 



Miller 16.642.160 tons 4.611.243 277 cu. ft. per'ton 



Combined and averaged 22.146.784 tons 5,458,887 246 cu. ft. per ton 



Miller's data gave itemized consumption by classes. In tabulation this was used 

 (1) a.s the basis of cubic contents of average pieces, and (2) was. on this cubic basis, 

 expressed In per cent of the total consumption for each class of product.^. 



