Fuel: To which is Appended the Value of Artificial Fuels as Compared with Coal

accumulation amount of heat annual artificial fuels atmos bituminous coal Captain Galton's carbonaceous carbonic acid cent chalk checkerwork chemical chimney clay coal dust coal tar coke compared with coal compound compression consumed consumption cylinder deposits domestic earth engine extent fireplace five patents flues formed into bricks fuel question gaseous George Stephenson give heat-producing horse power ignition increase indicated horse power ingredients iron Joule lately lime mastication matter mechanical melting mention metal mineral fuel mixed mixture moisture naphtha one-fourth ordinary oxide oxygen patent fuels patent records peat phere pitch portions potential energy power per hour present price of coal products of combustion proportion purpose quantity resin result of solar sawdust silica small coal smelting solar energy solid specification steam steel substance supply surface tanner's bark tion tons ture unit of heat utilized waste wasteful type weight