BAROMETER. 319 



Q. How can a BAROMETER warn SAILORS to 

 regulate their SHIPS ? 



A. As the barometer will tell when 

 wind, rain, or storm is at hand, the sailor 

 can make his ship trim before it overtakes 

 him. 



Q. Are there any RULES which can be depended 

 on? 



A. Yes; there are ten special rules 

 to direct us how to know the changes of 

 weather, by marking the mercury of a 

 barometer. 



Q. What is the IST SPECIAL RULE in regard 

 to the barometer ? 



A. The barometer is highest of all 

 during a long frost; and it generally 

 rises with a north-east wind. 



Q . W hy is the barometer HIGHEST of all during 

 a long FROST ? 



A. Because long frost condenses the 

 air very greatly ; and the more air is 

 condensed, the greater is its pressure on 

 the mercury of the barometer. 



Q. Why does the barometer generally RISE 

 with a NORTH-EAST wind P 



A. Because NORTH-EAST winds make 



