different kinds qfJCoaUgas Burners, ^c. 221 



with a flame of 3 J inches, 



Consumpt, . . . . 1 to 4.36 

 Light, . . . . 1 to 8 



And 4.36 : 8 : : 1 : 1.83— Gain 83. 



The width of the glass chimney was 17-lOths of an inch. 



Another burner of a similar nature, but having more holes, 

 was tried. The central aperture for air was 17-20ths of an inch 

 in diameter ; the diameter of the circle of holes 21-20ths ; the 

 number of holes 42 of the 50th of an inch in diameter. The 

 flame in the first trial was 1 inch. 



Consumpt, . . . 1 jet to 2.86 argand 

 Light, . . . 1 ... 2.146 



so that there was a loss in this case as compared with the jet. 

 When burned with l^-inch flame, 



Consumpt was . . 1 to 3.15 



Light, . . . 3.24 very little gain ; 



with flame of 2 inches, 

 Consumpt, . 

 Light, . 

 And as 4 : 6.304 



with flame of 2| inches, 



Consumpt, 



Light, 



And 4.8 : 7.035 : : 1 : 1.46^Gain 46 ; 



with 3i-inch flame, 



Consumpt, . . . 1 to 6.46 

 Light, . . . . 1 to 9.94 

 And 6.46 : 9.94 : : 1 : 1.82-^ain 82. 



This burner, then, having a greater number of holes, and 

 consuming gas in the ratio of 5.45 per hour to the other as 

 4.36, did not yield a greater light for the same consumpt. It 

 is remarkable, however, how very nearly the trials with these 

 burners agree, when the gas is burned under favourable circum- 

 stances, and they shew, also, how much saving there is by the 

 use of burners of the kind mentioned, the light of a jet and 

 of these burners being, for equal consumpt of gas, in the ratio 

 of 100 to about 182 ; consequently^ to procure the same light, 

 there is an immense saving when properly constructed argands 

 are used. 



Other argands were tried, but, though these were found to 



VOL. XXIX. NO. LVIII.— K)CTOBEK. 1840. Q 



