Investigations of the Preparation and Use of Lignite, 1918-1925, Issues 255-260

½ inch abrasive Alaska ammonia amount analysis anthracite apparatus approximately average binder bituminous coal boiler bonization briquets brown coal Bureau of Mines burned by-products calorific value capacity carbocite carbonized lignite cent Per cent clinker coke combustion commercial concentrate containing cost Creek crushed cubic feet cubic foot deposits discharge distillation district ditch dredging drill equipment Figure fire flange flues fuel bed fuel mass garnet gravel heating value hornblende hot zone hours after charging increase investigation jigs lignite carbonized lignite char low-temperature machine material methods mill miner's inches minerals moisture Morwell motor nitrogen North Dakota obtained offtakes operation oven percentage of ash pipe placer mining raw lignite residue retorts sample satisfactory screen Seward Peninsula shaft shows silicosis specific gravity steam stove suitable supply surface Table temperature tests thawing tion tons ventilation volatile matter yield