192 



BURNERS. 

 Fig. 40. 



air through the space left between the upper rim of an inverted cone and the 

 interior edge of the lamp. This annular ring was -^th of an inch wide, and 

 supplied twenty feet of air, so that the quantity was regulated to fifty cubic 

 feet exactly. The combustion of the gas was further improved by the air 

 being made to rush towards a point a, which it is evident would be its direc- 

 tion, and thus each atom of the elements of the carburetted hydrogen meets 

 its equivalent of oxygen, and becomes entirely decomposed. The interior 

 cone was made to adjust upon its supporting wire, and its annulus increased 

 or diminished at pleasure. 



This burner has lately been patented under the name of the double-cone 

 burner : certainly no contrivance would better deserve an exclusive privilege 

 had it been original, for this description of burner is by far the best Argand, 

 and should be universally adopted. An Argand burner three quarters of an 

 inch in diameter within the drilled ring, with a flame 2^ inches high, con- 

 sumes 3^ cubic feet per hour, and will require thirty-five cubic feet of air for 

 the proper combustion of the gas. A burner half an inch diameter will con- 



