224 Dr Fyfe on the Bluminating and Heating Power of 



Thus, in one case where a burner was tried, which had been 

 long in use in a bed-room, the 



Consumpt was as 1 jet to 2.14 fish-tail 



Light, . . 1 ... 2.44 



And 2.14 : 2.44 : : 1 : 1.14— Gain only 14. 



Now, in this case, the consumpt of the gas was the same as in 

 one of the former instances, but the light was very inferior ; 

 the former, when consuming 2.14, giving a gain over the jet 

 of 39, whereas this, consuming the same, gained only 14. 



Hence, then, the absolute necessity of keeping the burner 

 clean ; the easiest method of doing which is pushing occasion- 

 ally a bristle into the holes ; or, which is perhaps preferable, 

 rubbing the surface of the burner with a hair-brush. 



When, instead of using a single fish-tail, the flames from 

 two fish-tails are brought together by their flat surfaces, the 

 light is very much increased, as is at once evident by the in- 

 crease of illumination in the apartment. It occurred to me 

 that a burner constructed on this principle might be used with 

 advantage, provided the increase of light is not attended with 

 a proportional increase in the consumpt. On trial I did not 

 find this to be the case. Thus, when two fish-tails were burned 

 separately, the consumpt of gas was by both 4.44, compared 

 to that of the standard jet as 1 ; and when burned with their 

 flames united it was as 5, but the light was much increased : 

 thus, compared with the jet, the 



Consumpt was . 1 jet to 6 fish-tails 



Light, ... 1 ... 8.192 

 And as 6 : 8.192 : : 1 : 1.63— Gain 63. 



In another trial the gain on the jet was 59 ; thus making 

 the average 61. Now, in the experiments with single fish- 

 tails already given, the gain did not go beyond 40 ; so that 

 by this double fish-tail burner there is an evident increase of 

 light ; but, though this occurs, the gain is not greater than 

 when a good bat-wing, burning with its full allowance of gas, 

 is used ; besides the flame is by no means so steady. 



Other kinds were also tried, with the view of improving the 

 light, when small quantities of gas are required. The first 

 of these was composed of jets formed by drilling holes in a 

 straight line, at such a distance that the flames from them 



