Rift 11-86-1934 The gases in coal and the conditions controlling their escape-Continued. Relation of volume of methane to amount of coal mined or exposed.. Page. 36 36 37 39 40 40 41 42 42 42 43 45 46 48 48 49 50 51 51 52 52 52 52 53 54 56 58 58 58 58 60 60 61 61 62 63 64 64 64 67 69 69 70 70 71 JANJJJJ≈≈ The gases in coal and the conditions controlling their escape Continued. Page. 76 76 77 78 79 80 Coal oxidation as a source of gas...... Increase in temperature from oxidation.. 80 80 Absorption of oxygen by coal samples.. Effects of variation of atmospheric pressure on gas emanation. Investigations in Prussian mines... Tests by Hilt near Aix-la-Chapelle and Karwin. Review of Hilt's work by Mallard and Le Chatelier. Investigations in Austrian mines. 81 81 83 84 84 86 86 Relation of barometric pressure to amount of gas from fresh coal Probable error in figures for methane content in mine air.. Explosive gas in the northern anthracite coal field of Pennsylvania.. Explosive gas in the northern anthracite coal field of Pennsylvania Contd. Gas conditions in anthracite field compared with those in other American 172 Some features of fire-damp explosions in the northern anthracite field... 173 Explosive gas in mines in the southern part of the Illinois coal field.. 175 175 General features of the coal measures in southern Illinois. 175 |