Fire-places and Kitchen Utensils. 447 



cooking their victuals, but it would also have a powerful 

 tendency to facilitate and expedite the introduction of 

 essential improvements in their cookery, which is an 

 object of much greater importance than is generally 

 imagined. 



The boiler in question (represented in the Fig. 78) 

 is made double, or rather it is suspended in a hollow 

 cylinder of sheet iron. This hollow cylinder is certainly 

 useful, as it serves to confine the heat about the boiler ; 

 but as it renders the implement more expensive, and 

 may wear out or be destroyed by rust after a certain 

 time, I shall now show how a boiler, proper to be used 

 with one of the portable furnaces before recommended, 

 may be so constructed as to answer without a hollow 

 cylinder. 



The following figure represents a vertical section of 

 such a boiler of cast iron drawn to a scale of 8 inches 

 to the inch : 



Fig. 82. 



The essential difference between this boiler and that 

 last described consists in a rim of about f of an inch in 

 depth, which descends below its bottom, and forms a 

 kind of foot, on which it stands. This foot being made 

 of such diameter as to fit the sand-rim of the furnace, 

 into which it enters when the boiler is placed over the 

 furnace, the flame and smoke of the fire are confined 



