S/fi WILLIAM SIEMENS, F.R.S. 8 1 



back into the boiler. This apparatus was applied to a boiler which 

 previously consumed 8 Ibs. of water per Ib. of fuel, and the result 

 was that the consumption was reduced afterwards to only 6 or 

 6f Ibs. of water real evaporation per Ib. of fuel, while the engine 

 went, much faster in conse.quence of having drier steam. But 

 where the steam simply shot across the top of the depositing 

 vessel, as in the apparatus that had been described, he was satisfied 

 that a considerable quantity of water must be lost by being carried 

 across with it. 



OX A REGENERATIVE GAS FURXACE, AS APPLIED 

 TO GLASSHOUSES, PUDDLING, HEATING, ETC. 



BY MR. C. WILLIAM SIEMENS.* 



THE arrangement of furnaces about to be described is applicable 

 with the greatest advantage in cases where great heat has to be 

 maintained : as in melting and refining glass, steel, and metallic 

 ores, in puddling and welding iron, and in heating gas and zinc 

 retorts, &c. The fuel employed, which may be of very inferior 

 description, is separately converted into a crude gas, which in 

 being conducted to the furnace has its naturally low heating 

 power greatly increased by being heated to nearly the high 

 temperature of the furnace itself, ranging to above 3000 Fahr. ; 

 undergoing at the same time certain chemical changes whereby 

 the heat developed in its subsequent combustion is increased. 

 The heating effect produced is still further augmented by the air 

 necessary for combustion being also heated separately to the same 

 high degree of temperature, before mixing with the heated gas in 

 the combustion chamber or furnace ; and the latter is thus filled 

 with a pure and gentle flame of equal intensity throughout the 

 whole chamber. The heat imparted to the gas and air before 

 mixing is obtained from the products of combustion, which after 

 leaving the furnace are reduced to a temperature frequently not 



* Excerpt Minutes of Proceedings of the Institution of Mechanical Engineers, 

 1862, pp. 21-36, and 40-44. 



VOL. I. G 



