iVlA' PORtABLE rURNACe. 



Defcription of great advantage of this furnace {tQhkh was fit ^ invented h^ 

 the portable fur- ^^^ Black, and improved by others) above all others I am ac- 

 nace m chemical .^ . /• • i-,^i c i /rui 



operations. quainted with, conlifts m confivmmg as little tuel as poUible, 



in producing quickly, if required, a very intenfe heat — in 

 regulating expeditioufly, and at pleafure, its intenfity— ii> 

 applying it as direftly, and as fully as poffible, to the fub- 

 ftances upon which it is intended to aft — and moreover m 

 enabling the operator to perform his operations in the clofety 

 or in any other place, without the riik of endangering the 

 conflagration of the furrounding obieds, which were noi 

 meant to be expofed to the action of heat. 

 a 



■• This portable univerfal furnace is made of ftrong wrough? 

 iron plates. It is lined with bricks, bedded in fire-proof 

 loam. Its height without the chimney a a is two feet. The 

 inner diameter of the cylindrical fire-place meafures ten 

 inches. The body of the furnace is elliptical ; in its upper 

 part a circular hok is cut, for receiving an iron fand-pot b 

 which may occafionally be removed and exchanged for an 

 iron plate. In the front of the furnace there are three open-" 

 ingi over each other, f^rniiiiied with Hiding dogrs, and flitted 



'with 



