different kinds of Coal-gas Burners^ S^c, 225 



united. I had burners of this kind made with two, three, four, 

 and five holes ; but I did not find, when they were allowed to 

 bum with a flame of the same height as the jet, that there 

 was any increase in the light, over and above that from the 

 increased consumption. 



Thus, with a burner with three holes, of the same size as 

 that in the single jet, and the flame about three inches, the 



Consumpt was . 1 jet to 3 .07 jets 



Light, ... 1 ... 1.10 



so that the gain was a mere nothing. 



With a four-inch flame it was the same. 



With four holes and five holes, when the flames were from 

 three to five inches, there was a loss of light compared with 

 the jet ; the increase in light not keeping pace with the in- 

 creased consumpt. 



When, however, these burners are made to give the same 

 light as the jet of five-inch flame, there is a saving ; for, when 

 the single jet consumes gas as 100, these compound jets con- 

 sume only as from 80 to 90 ; thus giving a saving for the same 

 amount of light of from 10 to 20 per cent. They might, there- 

 fore, be used advantageously, but they are liable to one objec- 

 tion, — the flame is not so steady as that of the single jet, un- 

 less when used with a chimney. 



Considering the superior efficacy of the bat-wing, I was in- 

 duced to try a burner constructed on the same principle, but 

 so made as to consume a much smaller quantity of gas ; and I 

 have found this to answer well. I have had them made of 

 different sizes, but the chief object I had in view was to get 

 one which would consume the same, or nearly the same, as a 

 single jet. I did not, however, find, when this was done, that 

 there was any saving. When, for instance, the slit is small, 

 the flame is similar to that of a jet ; but, when the slit is 

 larger, then the flame becomes broader, and, though more gas 

 is consumed, there is an increase in light beyond the increased 

 consumpt. 



Thus, with a burner having a small slit, when compared 

 with the standard jet, in one instance, the consumpt was 1 

 jet to 0.97 slit ; in another^ 1 to 1.07 ; but the light was the 

 same. 



