74 BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 



may be placed, for the purpose of carrying on a variety of 

 operations. When the roof, or uppermost part, is placed 

 above the middle portion, and the openings in the sides of 

 the furnace closed, a very intense heat may be obtained, 

 which will be applicable to several purposes, such as the 

 melting of metals, and the reduction of metals from their 

 ores. The heat may be further increased, by affixing a long 

 funnel of sheet iron to the chimney, so as to increase the 

 draught of air through the fire. Two holes are made on 

 opposite sides of the furnace, to enable an iron or porcelain 

 tube to be passed through the body of the fire ; as in the 

 production of hydrogen, these holes have stoppers fitting 

 for effectually closing them when desired. Three sizes, 

 seven, ten, and twelve inches in diameter. 



Price, $3.75 ; $5.50 ; and $7.00. 



Fi s- 520 Dr. Black's Furnace.- 



(Fig. 520.) A very service- 

 able portable furnace ; used 

 for chemical operations, and 

 which may be applied to 

 numerous other purposes. 



A is a vessel of sheet iron, 

 lined around the part where 

 the fire is with fire brick, 

 that the heat may be the 

 better retained. B is the 

 chimney, which may be 

 lengthened at pleasure, c 

 is an aperture at the top, 

 for the reception of an iron 

 sand or water bath. D, D, 

 are two sockets for iron rods, which have a cross bar at 

 top, to suspend various boilers by, that they may be over 

 the fire. E is a porcelain tube or gun barrel, passing 

 through the fire, for the production of certain gases. This 

 may be removed when not wanted ; when one hole being 

 stopped up, the other will hold the nozzle of a pair of 

 bellows. F is an aperture, with a sliding door for the 

 reception of a muffle ; G is a door, by which a crucible may 

 be put in the fire ; and H is the ash-pit. The fuel may be 

 kept in the cavity under the chimney. Price, $15.00. 



