42 



ATMOSPHERIC DUST. 



Table XXVI. Mechanical Composition of Dust collected directly from the Atmosphere by 

 means of Whisks of Broom-corn smeared with Glycerine, June 16 — 22, 1895. 





lOT 



108 



109 



110 



LeD^h of 



diameter In 



mm. 



Maiinnim 



hourly velocity, 



9 miles. 



Maslmnm 



hourly velocity 



9 miles. 



Maximum 



hourly velocity, 



12 miles. 



Maximum 



hourly velocity, 



13 miles. 



16-8 











8-4 











4—2 











2—1 











1-i 











1 i_ 











J 1 



i 8 



tr.' 



tr. ' 



tr. 1 



tr. . 



X 1 



» 1 e 



0.0 1 



3.0 



3.0 



2.0 



1 1 

 10 TJ 



37.6 ■ 



32.4 ■ 



44.0 ■ 



3r,.o ■ 



1 1 



43.0 ■ 



43.0 ■ 



44.0 ■ 



40.0 p 



■BT TTg- 



10.3 1 



10.0 1 



7.0 r 



lU.l 1 



xis rj¥ 



1.0 f 



1.0 f 



.4 f 



1.2 



TahleXXVI. (Continued. 



Maximum 



hourly velocity, 



19 miles. 



IVIaxlmum 



hourly velocity 



22 miles. 



Maximum 



hourly velocity, 



22 miles. 



Average. 



