CHEMICAL APPARATUS. 



over the flame, in the manner of a lamp-glass, to concentrate 

 the heat by preventing its radiation sideways. 



Price, 15.00. 



Fig. 519. 



Fig 518. 



Fig. 517, 



Knight's Chemical Furnace. (Fig. 518, as above.) This 

 is one of simple construction and of general application. It 

 is represented as follows : A, is the ash -hole door ; B, the 

 fire-place door, in which muffles, crucibles, &c., are to be 

 introduced ; c, a door above the fire for introducing retorts. 

 The top also may be wholly removed to insert a still or sand 

 bath. D, E, are doors of different heights, leading to the 

 fire, for the more convenient introduction of different appa- 

 ratus ; F, the hole for the introduction of a gun barrel : o 

 and H, handles by which the whole furnace may be re- 

 moved. Price, $8.00 to $12.00. 



Stone Ware Portable Table Furnace. (Fig. 519, as above.) 

 This furnace of stone ware, and capable of standing an 

 intense heat, consists of three parts that fit upon each 

 other, each part being firmly bound with iron hoops. A 

 fire made in the bottom part the two upper pieces being 

 removed will serve for heating materials in crucibles, ladles, 

 retorts, &c. If the middle portion of the furnace is placed 

 above the bottom part, a larger fire may be made, and if an 

 iron or copper dish be fitted into the upper rim, it may be 

 used for heating sand ; and thus a small sand bath will be 

 obtained, in which retorts, flasks, evaporating dishes, &c., 

 VOL. n. 7 



