16 



Mr. G. Gore on a new Gas-Furnace for 



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After making a consider- 

 able number of furnaces of 

 different kinds, I at length 

 found an arrangement pos- 

 sessing almost completely all 

 the qualifications desired. It 

 is as follows : — A is a cy- 

 linder of fireclay about 9 

 inches high and 6 inches 

 diameter, open at both ends, 

 and with a hole in its side 

 near the bottom to lead into 

 the chimney; it is covered 

 by a moveable plate of fire- 

 clay, B, with a hole in its 

 centre for introduction of the 

 crucible or of substances to 

 be melted: this hole is closed 

 by a perforated plug of fire- 

 clay, C, for access to the 

 contents of the crucible; and 

 that again is closed by an- 

 other stopper of clay, D. E is a chimney of sheet iron about 5 

 or 6 feet high, kept upright by a ring of iron, F, attached to the 

 top of the furnace. 



The fireclay cylinder is enclosed in a sheet-iron casing with a 

 bottom of iron, to which are fixed three iron legs, G. An iron 

 tube, H, with a prolongation, I, supports by means of the screw 

 J, the burner K and its tube L, which is open at both ends. 

 Gas is supplied to the burner by means of the tap, M, which has 

 a small index, N, attached to it for assistance in adjusting the gas. 



Inside the larger cylinder is another fireclay cylinder or cu- 

 pola, O, with open ends, and with three projections of fireclay, 

 P, for supporting the crucible Q ; it is kept steady by means 

 of three clay marbles, R. 



The gas-burner is a thin metal cylinder deeply corrugated at 

 its upper end, with the corrugations diminishing to nothing at 

 its lower end. 



The action of this furnace is as follows : — Gas is admitted to 

 the open tube L by the tap M ; it there mixes with air to form 

 a nearly explosive mixture, which ascends through the burner 

 and burns in the clay cylinder O, being supplied with the re- 

 mainder of air necessary to complete combustion through the 

 tube H to the outer surface of the flame by means of the spaces 

 between the corrugations. The flame and products of combus- 

 tion pass up through the cylinder O, and then downwards out- 



