SMOKY CHIMNEYS. 69 



2ndly The cold air (oozing through 

 the chinks) chills the air in the chimney, 

 and prevents its ascent. 



Q. Why will an AKNOTT'S STOVE SMOKE, if 

 the joints of the flue do not Jit air-tight ? 



A. Because the cold air (which gets 

 through the joints) chills the air in the 

 flue, and prevents its ascent. 



Q. Why does an old fashioned FARM CHIM- 

 NEY-PLACE so often smoke ? 



A. Because the opening is so very 

 large, that much of the air which goes 

 up the chimney, has never passed near 

 the fire ; and this cold air mixing with 

 the other, so reduces its temperature, 

 that it ascends very slowly, and the 

 draught is destroyed. 



Q. Why does a chimney smoke, if the 



DRAUGHT be SLACK ? 



A. Because, unless the current of 

 air up the chimney be very powerful, it 

 cannot buoy the smoke up through the 

 flue. 



Q. If the opening of a chimney le TOO 

 LARGE, what REMEDY can be applied ? 



A. The chimney-place must be con- 

 tracted. 



