ATMOSPHERIC DUST. 



45 



Table XXV III. IVIechanical Composition of Dust collected dfreclly from the Atmosphere 

 by Means of Slack Wind In a hollow Cylinder, July, Aug., and Sept., 1895. 



Length of 



diameter in 



mm. 



Maximum 



hourly velocity, 



14 miles. 



Maximum 



hourly velocity 



18 miles. 



Maximum 



hourly velocity, 



18 miles. 



Maximum 



hourly velocity, 



in miles. 



16—8 

 8-4 

 4—2 

 2-1 

 1-i 



1 1 



4 ¥ 



1 1 



"S Iff 



_1 1 



Iff "J^ 



1 1 



•JS ffT 



1 _ 



Tsrs" 



"rlir 



.5 



1.0 



11.1 L 



32.0 



33.4 .■ 



40.0 



40.1 ■ 



17.7 



13.3 r 



7.5 



1.6 r 



1.6 



TaUe XXVIII. (Continued). 



132 



Maximum 



hourly velocity, 



20 miles. 



133 



Maximum 



hourly velocity 



21 miles. 



Maximum 



hourly velocity, 



23 miles. 



Maximum 



hourly velocity. 



24 miles. 



tr. 



6.8 

 47.6 

 35.4 



9.5 



I 



8.5 

 52.9 

 27.4 

 10.2 



\ 



1.0 

 15.6 

 44.9 

 27.0 

 10.0 



