380 



GAS-LIGHTING, REGENERATIVE SYSTEM OF. 



of heat. The length of the luminous flame is 

 governed by a porcelain cylinder which rests 

 upon tlie top of the central Vehamber. The 

 flames sweep upward around this, and down- 

 ward over its upper edge, presenting a beauti- 

 ful ball of flame. Two notched plates at the 

 level of the gas- orifices serve to divide the up- 

 ward column of air, and cause it to impinge 

 Tn the flame. When the burner is first light- 

 the products of combustion pass directly 

 upward through the chimney d, and out by the 



adopted, the side draught-pipe is retained, but, 

 instead of the closed chimney d, the flame is sur- 

 rounded by a short glass cylinder, which simply 

 serves to protect the flame from side-draughts, 



FIG. 4. 



escape-flue E. Bat as this becomes heated, the 

 draught through the pipe G becomes sufficiently 

 powerful to draw the flame downward. Some 

 little time has to elapse before this takes place, 

 and the burner therefore can not be turned on 

 full at once. In Fig. 5, the side draught-pipe 

 G is replaced by a central pipe, H ; otherwise, 

 the construction is the same. In the form finally 



Fiu. 5. 



the ascending current of hot air being strong 

 enough to control the form of the flame. 



Experiments made in France with this burn- 

 er, with twelve-candle gas (twelve candles to 

 the five-foot), showed the results given in the 

 following table : 



