Show gaa ciao from the cokin cokley ol az coal in reviewing the different methods now cow in vogue for obtaining illuminating gas and or fuel gas the two kinds produced from coal by means ean rf of the retort coke oven system mr W 0 irwin remarks upon the great reat extent attained by this industry athas been estimated ed he says that tor for eacutt aaa toa conof tonof of coke produced upward of cude feet of tai isi are driven off aadi the entire product yielded annually ia a the united states by the cold co ansot neof coal coa allowing one cue halt liala to bo be consumed in the bokinz proc process ess is u upward ot of sixty billions of cubia feet 2 A than efian one fourth bof the natural ins gas production at the bought at cotita 1 I ts most nourishing nouri shins period ji tic ia byproduct by product oven tar is SURer superior for to the tar which comes from the gas it COU conta taing ica less pitch h mhd the yield sor each ton a ct coke varying to io pounds according to the mount aunt ot VO volatile Litile matter am contained t 2 in ed in the he coal cassler 7 |