No. XX. 

 EXramMENTS 



On the Fusion of various refractory Bodies, by the 



COMPOUND BLOW-PIPE of Mk. IIAHE, 



By benjamin SILLIMAN, Prof. Chem. and Min. in 

 Yal£ College. 



A SECTION OF THE PNEUMATfC CISTERN of Yale 

 College with the COMPOUND BLOW PIPE or 

 Mr. Hare for burning hidrogen, mingled with ox- 



IGKN GAS. 



E E 



-% Ff^P 



3 

 aS^ oof. 



2 Feet. 



References to the Figure. 



AAAA. — ^The pneumatic cistern, filled with water ; for a 

 plate, and full description, see the Boston Edition of Henry's 

 Chemistry. 



B. — A Gas Heservoir, of the capacity of tweh^e gallons, 

 filled with oxigen gas, either by the action of the hydrosta- 

 tic bellows at O, or, by a recurved tube, passing from above, 

 through the water, and hooked under B : parallel, and conti- 

 guous to B, on the other side of the cistern, is another gas 

 reservoir, of the same capacity, which may be connected with 

 B, or not, at pleasure. 



