70 



The Sweet Potato 



is placed on a slight slope with the fire box at the lower 

 ead, thus giving the necessary slope to the floor. 



" The fire box is constructed of brick and should be 



arched. The di- 

 mensions (as 

 given in Fig. 7) 

 are 1& inches 

 wide (inside 

 measurements), 

 20 inches high, 

 and 4 feet and 8 

 inches long. The 

 terra cotta flue 

 pipe leading un- 

 der the bed is 8 

 inches in diame- 

 ter and should 

 extend the entire 

 length of the 

 frame into the 

 chimney at the 

 other end. The 

 first two or three 

 joints of the flue 

 should be covered 

 with brick, as the 

 blaze from the 

 fire might cause it to become too hot and endanger the 

 floor. The chimney may be made of brick or by nailing 

 together four 12-inch boards in box fashion. The chim- 

 ney should be larger than the flue under the floor as it 

 will draw better. 



7«'-"- 



FiouEE 7. — Showing the construction 

 of a fire-heated draw bed. 



