The following table was prepared from the date of that preceding combined with the prices of various coals to be obtained in the local market. The table is intended to present a method of comparing the values of fuels from different coal areas. The consumer is interested to know the amount of heat purchased in the form of fuel. The table shows in the column headed “Heat per $1,” the number of B.t.u. purchased for $1 in coal; the number of available B.t.u. in the different kinds of coal may be taken as a relative comparison of their values as fuel. The gas-coke in the table is that sold by the local gas company. The amount of moisture in this case is relatively high because of the fact that the coke is stored in a yard exposed to the weather, where it absorbs all precipitated moisture. A less amount of moisture would give a higher value for the same fuel. ------------+-----+------+----------+---------+-----------+----------- | | | | |B.t.u. per | |Price| Per | |B.t.u. to|100 ÷ cost | | per |cent.,|B.t.u. per|evaporate| per 100 | Heat Kind of coal| ton |water |100 pounds| water | pounds | per $1 ------------+-----+------+----------+---------+-----------+----------- 1,336,565 Bituminous $7.50 2.44 1,340,000 - 3,439 = --------- = 3,564,000 Pennsylvania $0.375 B.t.u. ---------------------------------------------------------------------- Semi- 1,415,685 bituminous $9.00 3.06 1,420,000 - 4,315 = --------- = 3,145,000 West Virginia $0.45 B.t.u. ---------------------------------------------------------------------- 1,101,012 Gas-coke $7.00 10.00 1,117,900 - 16,888 = --------- = 3,145,000 $0.35 B.t.u. ---------------------------------------------------------------------- North 607,282 Dakota $4.50 35.90 668,000 - 50,728 = ------- = 2,703,000 lignite $0.225 B.t.u. ---------------------------------------------------------------------- 1,017,602 Bituminous $7.50 10.31 1,032,000 - 14,398 = --------- = 2,980,000 Illinois $0.375 B.t.u. ---------------------------------------------------------------------- 994,529 Bituminous $7.50 13.10 1,012,000 - 18,471 = ------- = 2,652,000 Iowa $0.375 B.t.u. ----------------------------------------------------------------------