Fire-places and Kitchen Utensils. 355 



- Fig. 29. 



The bottom of the cover may either be made quite 

 flat, as in this section : 



Fig. 30. 



I J 



Or it may be made concave, and of a conical form, 



thus : 



Fig. 31- 



Or concave, and of a spherical figure, as is represented 

 in the following figure : 



Fig. 32. 



The only utility derived from making the bottom 

 of the cover hollow instead of flat is that a little more 



