20(jp ON EVAPORATING FCRNACES. 



Such advantages appeared to me to be of fufficient importance 

 todeferve to be known, and to make it dcfirable that advan- 

 tage may be taken of a new procefs which will have great 

 influence on the economy of the fuel neceffary in manufac- 

 tures. 



Defcription of the Furnace. Plate 



Defcriptlon of A. Opening of the fire-place: it is 16 inches wide and 13 

 the new furnace, , . , 

 high. 



B. This part of the furnace refembles a vault; It is Slf 

 inches in height, 31 f in width, and 5 feet in depth. To add 

 to the effedt produced by the heat, I give the middle of the 

 fire place a depth of 2 inches more that at its fides, which niaken 

 it preceptibly concave. 



C. An opening made in the middle of the vault, and which 

 is intended to increafe the rapidity and the action of the calo- 

 rific rays; it is 5 inches high, and is equal in thicknefs to the 

 vault. In its lower part, this opening is 23f inches long, and 

 I?! wide; and, in its upper part, is 191 long, and 13f wide, 

 which gives each extremity of the opening the form of a fphe- 

 roid whofe longed axis is in the diredtlon of the length of the 

 vault. 



D. The difiance of the copper from the orifice for the heat 

 is 5 inches in the middle, and is reduced to 4, at the angle 

 E, which gives the advantage of concentrating the calorific 

 rays, in proportion as they lofe their intenfity by their ex- 

 panfion. 



From the angle E to that at F, there is a di fiance of 15 

 inches: there-entering angle of F is 2^ inches from the cop- 

 per, and its faliant angle only one inch. 



G and H are angles fimilar to that at F, but which are 1 1 

 inches diftant from each other : thefe angles may be multiplied 

 according to the height of the copper. The advantages which 

 they give confift in making the calorific ftreara undergo feveral 

 breaks, which increafes their power at the place of their 

 deviation. 



I is an opening communicating with the chimney : it is 27 

 inches wide and 5 inches high. At the angle H, half the 

 circumference of the furnace fliould be clofed by a row of 

 bricks, for the purpofe of forcing the heat to dire^ itfelf from 



the 



