72 



GENERAL SCIENCE 



E. to N.E. 



Barometer 30.10 and above and 

 falling rapidly (winter). 



S.W. to N.W. 



Barometer above 30.2 inches and 

 falling slowly. 



S.W. to N.W. 



Barometer 30.1 to 30.2 inches and 

 falling rapidly. 



S.W. to N.W. 



Barometer 30.1 to 30.2 inches and 

 falling slowly. 



S.E. to N.E. 

 30 and below and falling rapidly. 



S.E. to N.E. 

 30 and below and falling slowly. 



E. to N. 



Barometer 29.8 or below, falling 

 rapidly. 



S.E. to S.W. 

 With barometer falling. 



N. and E. 

 With barometer falling. 



Rain or snow, with increasing wind, 

 especially if wind is from N.E. 



Slowly rising temperature and fair 

 for 48 hours. 



Warmer, with rain in from 18 to 

 24 hours. 



Warmer, with rain in from 24 to 

 36 hours. 



Rain, with high winds, followed in 

 24 hours by clearing and cooler. . 



Rain for one or two days. 



Severe N.E. gales and heavy rains 

 or snow, followed in winter by cold 

 wave. 



Storm coming from W. or N.W., 

 followed by cooler and W. to N.W. 

 winds. 



Storm coming from S. or S.W., 

 followed by cooler and N. to N.W. 

 winds. 



World Winds. The air at the equator becomes heated and rises, 

 while cold air from the north blows toward the equator to take the 

 place of the rising air. The air moving from the north will become 

 heated and begin to rise near latitude 30 degrees, joining the warm 

 air coming up from the equator on its way to the north. A part of 

 the air coming up from the equator will become cold, and flow 

 downward, joining the cold air going toward the equator at lat- 

 itude 30. 



These places on the earth's surface are called " horse latitudes." 



Here air has an upward and downward movement, and there is no steady 

 horizontal wind. The term horse latitude was applied by sailors in the days 

 of sailing vessels which carried horses from New England to the West Indies. 



