78 



WRITINGS OF JOSEPH HENRY. 



[1855- 



side, the shading represents the amount of wind from the 

 different points of the horizon during the winter mouths 

 in New England, from the average of a large number of ob- 

 servations at different places. Hence it will be seen that the 

 pre^lominant wind during the winter, in this part of the 

 United States, is from the northwest; the next in amount is 

 from the northeast and southwest, the eastern and south- 

 eastern portion of the horizon during the winter exhibiting 

 but little wind. The next circle to the left shows the great 

 preponderance of wind in New England from the south- 

 west during the summer. The winds exhibited in the two 

 circles combined will produce a general resultant from the 

 west. The next circles to the left exhibit the amount of wind 

 in summer and winter in the State of New York. In winter 

 the o-reatest amount is from the northwest, and in summer 

 from the southwest. 



No. 2 presents the winds in Pennsylvania, and in Illinois, 

 Wisconsin, and Iowa. 



No. 2. 



Illinois, Wisconsi7i, Iowa. Pennsylvania. 



Summer. Winter. Summer. Winter. 



From these it will be seen that in Pennsylvania the wind 

 is more westerly in winter than in New England, but still 

 the greatest amount is from a point north of west. In sum- 

 mer the greatest amount is found a little south of west. 

 During winter in the States of Illinois, Wisconsin, and Iowa, 

 generally, the greatest prevalence is from the northwest, and 

 in summer from the west and south. The maximum is a 

 little east of south ; the southwestern half however of the 

 horizon in both seasons has the greatest amount. 



The circles in No. 8 indicate that in Nebraska and Kan- 

 sas the greatest amount of wind in the winter is from the 



