SMOKY CHIMNEYS. 67 



the surrounding hill,s) rebounds lack 

 again upon the chimney, and destroys 

 its draught. 



Q,. What is the common KEMEDY in both 

 these cases ? 



A. To fix a cowl on the chimney 

 top, to turn like a weather-cock, and 

 present its back to the wind. 



Q. Why will not a COWL always PREVENT 

 a chimney SMOKING ? 



A. If the wind he strong, it will keep 

 the opening of the cowl towards the steeple 

 or hill ; and then the reflected wind will 

 blow into the cowl, and down the chimney. 



Q. As a cowl is such a poor remedy, can 

 any OTHER be devised ? 



A. If the chimney flue can be carried 

 higher than the steeple or hills, no wind 

 can enter the flue. 



Q. Why cannot the wind enter a chimney flue, 

 if it be carried up HIGHER than the steeple or hills ? 



A. Because the reflected wind would 

 strike against the sides of the chimney- 

 flue, and not pass over the opening at all. 



Q. In what OTHER cases will a CHIMNEY 

 SMOKE? 



