different kinds of Coal-gas Burners, cjr. 231 



for affording light, and when at the same time it is of conse- 

 quence to avoid as much as possible its heating effect, argands 

 ought to be employed, because, for equal consumpts, they give 

 much more light than other kinds of burners ; consequently, 

 to get the same light, a smaller quantity of gas is requisite, 

 and the heating effect will be proportionally less. On the 

 contrary, when, along with light, it is desirable also to have 

 as much heat as possible, then fish-tails should be used, be- 

 cause, to give the same light as the argands, a larger quantity 

 of gas must be consumed. 



III. On the tise of Gas as a source of Heat 



From what has been said, it appears that, for equal quanti- 

 ties of gas consumed by the different kinds of burners now in 

 use, the same amount of heat is evolved, and that, therefore, 

 it is of no consequence how the gas is burned, provided the 

 combustion is perfect ; but in using gas as a source of heat, 

 other methods have been recommended, and different means 

 have been resorted to for economizing it ; and from the due 

 application of which, we may be enabled to answer the im- 

 portant question, whether gas may be employed with economy 

 for this purpose ? 



For many purposes, the argand burner with a copper chim- 

 ney will be found a very convenient method of applying heat. 

 It has, however, this objection, that, unless used with caution, 

 it is apt to smoke. The object to be warmed ought never to 

 be brought too near the top of the chimney. 



For most purposes, a much more convenient form of burner 

 is the rose jet, which is merely a tube terminated by a hollow 

 flat top, of an inch or two inches in diameter, according to cir- 

 cumstances, and the sides of which are perforated with aper- 

 tures, at the distance of about a quarter of an inch from each 

 other. By this means we have a series of jets, burning nearly 

 horizontally, so that the flame may be spread out to a greater 

 or less extent, as it may be required. The only precaution 

 necessary, is to take care that the apertures are at such a dis- 

 tance from one another, that the flames shall not rush to- 

 gether when they are burned low, and by which smoke is 

 occasioned. 



