48 



MR JOHN AITKEN ON THE NUMBER OF DUST PARTICLES IN THE 



Table of the Number of Dust Particles in the Atmosphere — continued. 



Place. 



Date. 



Hour. 



Number of 



Particles 



per cc. 



Wind. 



u 



8 p 



2 5 



CD 



H 



>> 



a 

 3 



w 



State of 

 the Air. 



Remarks. 





July 

















KlNGAIRLOCH . 



23 



1 P.M. 



148 



N.W. 4 



59 



2 



Very thick 



Sky clearing. 







3 P.M. 



258 



N.W. 3 



58 



3 



Medium 



6 m. -jJfy ; rain ceasing. 







6 P.M. 



237 



N.W. 2 



55-5 



4 



Thickish 



10m.|; been blowing very 

 hard. 



>> 



24 



10 A.M. 



151 



N.W. 2 



57 



5-5 



ii 



10 m. J ; showers. 







1 P.M. 



210 



N.W. 3 



58 



6 



Clear 



10 m. sV 







6 P.M. 



200 



N.W. 1 



52-5 



1-5 



Thick 



Raining. 



o 



25 



9 A.M. 



253 



i) 



56 



4 



Very clear 



10 m. ^ , 







10 A.M. 



203 



N.W. 0-5 



ii 



ii 



Clear 



10 m. jJq ; a few drops of rain. 







3 P.M. 



1,325 



S. 0-5 



59-5 



5-5 



Hazy 



10 m. \. 







6 P.M. 



2,200 



S.E. 0-5 



57 



6 



Clear 



20 m. tV 



j) 



26 



9 A.M. 



1,450 



ii 



57 



1 



Extremely 

 thick • 



Limit l| m.; raining. 







10 A.M. 



1,950 



ii 



58 



1-5 



ii 



Raining. 







1 P.M. 



37 



W. 0-5 



63 



3 



Thick 



Misty rain. 







3 P.M. 



55 



W. 1 



64 



1-5 



ii 



ii 







6 P.M. 



290 



W. 0-5 



56 



3 



Clear 



10 m. tV 



)> 



27 



10 A.M. 



800 



S. 1 



56 



2 



Very thick 



\\ m. \; raining. 







3 P.M. 



1,437 



S.W. 1 



62 



7-5 



Thin haze 









7 P.M. 



1,950 



S.E. 2 



57 



5 



Thickish 



10 m. 1 



)> 



28 



10 A.M. 



1,050 



S.W. 1 



54 



4 



Clear 



Passing showers. 







1 P.M. 



825 



W. 3 



60 



5 



Thick 



n ii 







3 P.M. 



860 



ii 



55 



3 



ii 



ii ii 







7 P.M. 



1,035 



N.W. 3 



56 



4 



ii 



Passing showers ; very stormy 

 on loch. 





Sept. 

















Alfoiw . . 



8 



6 P.M. 



3,400 



W. 0-5 



62 



7-5 



ii 



Thick haze ; fine day. 



11 



9 



10 A.M. 



750 



ii 



56 



3 



Medium 



Cloudy. 







11 A.M. 



325 



N.W. 1 



60 



5 



Clear 



Half clouded. 







5.30 P.M. 



3,700? 



S.E. 0-2 



54 



2-5 



Thick 



Beginning to rain. 



)> 



10 



10 A.M. 



127 



N.W. 1 



55-5 



7 



Very clear 



Cloudy. 







5 P.M. 



192 



W. 



56 



5-5 



ii 



Clouded all day. 



II 



11 



10 A.M. 



242 



N.W.N. 3 



54-5 



4 



ii 



Showers on hills. 







5 P.M. 



1,825 



n 



54-5 



4-5 



Clear 



Numbers variable. 



II 



12 



10 A.M. 



192 



N.W.N.1 



60 



6 



Very clear 



Clouded. 



II 



13 



10 A.M. 



2,000 



E. 0-2 



63 



7 



Hazy 



Numbers very variable. 







5.30 P.M. 



4,400 



S.W. 1 



61 



5 



Thick haze 



Wind been S. 



, 11 



15 



10 A.M. 



3,900 



S.S.E.1-5 



53-5 



2 



Extremely 

 thick 



Clouding over. 







1.30 p.m. 



4,000 



S. 1 



58 



4 



n 



Clouded. 







5.30 p.m. 



3,300 



ii 



56 



2 



ii 



ii 



II 



16 



10 A.M. 



4,300 



S. 1-5 



57-5 



3 



ii 



Passing clouds. 







5.30 p.m. 



3,900 



S. 1 



56-5 



2-5 



ii 



Cloudy. 



II 



17 



10 A.M. 



2,350 



S. 2 



55-5 



1-5 



ii 



Thickest day here. 







5.30 p.m. 



1,850 



ii 



55-5 



3 2 



Very thick 





>l 



18 



10 A.M. 



4,750 



S. 1 



58 



2 



Extremely 

 thick 



Dull, clouded. 







6 P.M. 



6,800 



ii 



57-5 



2-5 



ii 



Quarter clouded. 



II 



19 



10 A.M. 



1,950 



S. 0-2 



56 



2 



n 



Raining during night. 



