Show less coal used in making coke the quantity of coal required to produce a ton lou of coke Is much less than formerly the average gain 11 lo 10 1912 compared with ten years ago to li probably probable at least 10 pounds it la Is doubtful tf if in the earlier years the actual yield of coal in coke exceeded 60 per cent whereas in 1912 it was 67 per cent according to tn tho the united states geological survey this gain ls IE largely due to the increase in ahr production of byproduct by product coke lif in th the y yield feld of coke irom a ton of cual it t v very ry much higher thin in making be bat hire coke |