Fire-places and Kitchen Utensils. 409 



principles recommended in the seventh chapter of this 

 (tenth) Essay. These portable furnaces are peculiarly 

 adapted to kitchen utensils constructed on those prin- 

 ciples, and also to boilers and stewpans with steam- 

 rims, which are not made double; but for double or 



Fig. 61, 



armed boilers, stewpans, etc., the furnace must be made 

 in a different manner. The simplest form for portable 

 furnaces adapted to armed boilers is that represented 

 by the Figs. 55, 56, and 57; but I shall now give an 

 account of a furnace of this sort constructed on differ- 

 ent and better principles. 



The following figure represents a vertical section of 

 a small portable kitchen furnace of cast iron. 



On examining this figure, it will be found that care 

 has been taken, in contriving this furnace, to divide it 

 in such a manner into parts, and to give to those parts 

 such forms as to render the whole of easy construction. 

 It consists of three principal parts ; namely, of the fire- 

 place, A, which is a hollow cylinder, or rather an 

 inverted hollow truncated cone, 7 inches in diameter 

 above measured internally, 4 inches long or high, 



