478 



WRITINGS OF JOSEPH HENRY. 



[1875 



Fig. 8. 



slow velocitj'' at the surface, while having a slightly increased 

 velocity above. Had there been no wind, according to this 

 view the two curves would have exhibited two concentric 

 circles. 



Experiments of Septembei' 4. — Barometer, 29"85 inches, fall- 

 ing; thermometer, dry bulb, 77° F. ; wet bulb, 73-25°. Wind 

 south by west, twelve and one-fourth miles per hour at the 

 top of the tower, and nine and one-fourth miles at the bottom ; 

 variable. 



