104 JOURNAL OF THE 



For the complete combii.stion of the gas, then, it is necessary 

 to increase the proportion of oxygen admitted to secnre a good 

 flamCj the pressure must be greater and a fine draught insured. 

 Since devising this modification of the Bunsen burner, I have 

 had no difficulty in the use of the carburetted air. The Spring- 

 field gas machine in use is a small one, holding about three bar- 

 rels, and we pay careful attention to the specific gravity of the 

 gasoline used and to the weight of the stone which runs the fan, 

 thus securing the best results. The burner presents so many 

 advantages in its use, however, that I have thought it advisable 

 to draw attention to it as a good form also for laboratories where 

 coal-gas is at command. The main feature is that the supply of 

 gas is regulated at the base of the burner by a milled wheel and 

 that this supply is diminished only at the issuing jet inside the 

 chimney. 



The advantages are: 1st. An easy and convenient mode of 

 regulating the supply of gas, independent of the regulation of 

 the air. 



2d. The screw motion gives a means of securing a gradual and 

 accurate decrease or increase of flame. 



3d. As the gas is checked in its flow only at the issuiag jet 

 there is but little diminution of pressure, which for the use of 

 gasoline gas is a very essential point. It enables one to secure 

 a very small and still colorless flame. 



4th. This burner is a very powerful one. 



This burner has proved very satisfactory in the laboratory 

 here, and very favorable reports of it have been received from 

 laboratories using coal-gas where it has been tried. The burner 

 is manufactured by Gilbert & Barker Manufacturing Company 

 of New York. 



