4 1 6 On the Construction of Kitchen 



form on the inside will be more regular, and it will be 

 better adapted on that account for receiving the end 

 of the tube, which it is designed to receive. Its length 

 need not exceed i inch or ij inches, and its internal 

 diameter may be about i \ inches at its projecting ex- 

 tremity, and something less at its other end, where it 

 joins the side of the furnace. 



Of small portable Kitchen Furnaces constructed of 

 Earthen-wa re. 



The following figure represents a furnace of this 

 kind (of earthen-ware) destined for heating boilers of 

 the same kind and of the same dimension as those 

 proper to be used with the two (iron) furnaces last 

 described : 



Fig. 64. 



This figure represents a vertical section of the fur- 

 nace, drawn to a scale of 6 inches to the inch ; and it 

 gives an idea so clear and satisfactory of the form of 

 this furnace that a detailed description of it would be 

 superfluous. 



The fire-place is distinct from the body of the fur- 

 nace, and its form and position are such that it cannot 

 crack and injure the body of the furnace by its expan- 

 sion with heat. It resembles very much the cast iron 



