and the Economy of Fuel. 157 



DESCRIPTION OF THE PLATES. 



PLATE I. 



Fig. i. A view of a double cover for a boiler or 

 saucepan. In this design the rim is seen which enters 

 the boiler, and the tube by which the steam goes off is 

 seen in part (above), and is in part indicated by dotted 

 lines. (See page 15.) 



Fig. 2 shows this cover placed on its boiler. Part of 

 the side of the cover is represented as wanting, in order 

 that the steam tube might be better seen. The height 

 of this cover is represented as being equal to one half 

 its diameter ; but I have found one third of its diameter 

 quite sufficient for its height. 



Fig. 3 and Fig. 4 are views of my circular dishing- 

 grates for closed kitchen fire-places. They may be 

 made of any size, from 5 inches to 1 8 inches in diameter, 

 according to the size of the boiler. The rules I have 

 in general followed, in determining the size proper for 

 the grate for any (circular) boiler, has been to make 

 its diameter equal to half the diameter of the boiler at 

 the brim. (See page 35.) 



Fig. 5 is an inverted hollow cone of thin sheet iron, 

 which is placed immediately under the grate, its brim 

 being made to receive the circular rim of the grate. 

 When the fire-place is large, this inverted cone may be 

 made of fire-stone, or constructed of bricks and mortar. 

 For small fire-places it may be made of earthen-ware, 

 which is, perhaps, the very best material for it that can 

 be found. (See page 37.) 



