FLAME. 



229 



blown forward, upon the substance, mixed with little 

 air. The extremity of 

 the blow-pipe is placed 

 against the outer wall of 

 the flame, a little higher 

 than in the previous case. 

 The flame thus produced 

 is yellow, and of the shape represented in the figure. 

 The oxide to be reduced, is to be placed within the 

 yellow body of the flame, but near its termination. 

 The litharge produced in the last experiment, may 

 be re-converted, by this means, into metallic lead. 

 568. OXYHYDHOGEN BLOW-PIPE. The 



Describe the compound or oxhydrogen blow-pipe, as 



oxyhydrogc* 



blow-pipe. commonly constructed, consists of two 



gasometers, containing, the one, oxygen, 

 and the other hy- 

 drogen gas. Tubes 

 leading from these, 

 are brought together 

 at their extremity, 

 and the two gases are 

 burned in a single jet. 

 The heat thus pro- 

 duced, is the most in- 

 tense that has ever 

 been realized except 

 by galvanic means. Iron, copper, zinc, and other metals, 

 melt and bum in it readily ; the former, with beau- 

 tiful scintillations, and the latter, with characteristic 

 colored flames. With a sufficiently constant flame 



10* 



