1889 - 90 .] 
Mr John Aitken on Dust Particles. 
249 
Number of Dust Particles — continued. 
Places. 
Date. 
Hour. 
Number 
of Par- 
ticles 
per c.c. 
Wind. 
Tempera- 
ture. 
Humidity. 
State of 
the Air. 
Remarks. 
June 
London, . . 
3 
12.0 a.m. 
84,000 
blowing direct from Battersea 
V 
116,000 
Park. 
48,000 
W. 3. 
Wind increased. 
1.0 p.m. 
84,000 
” 
July 
2.30 p.m. 
150,000 
At window in Victoria Street. 
Kingairloch. 
3 
12.30 p.m. 
3,150 
S.E. 1. 
73 
13 
Haze. 
Observations made at about 50 
3,000 
feet above the level of the sea. 
7.0 p.m. 
2,150 
f ” • 
2,250 
2,200 
e. i. 
;; 
4 
11.0 a.m. 
3,600 
70 
10” 
Thick haze. 
4,000 
7.0 p.m. 
1,550 
W. 1. 
1,250 
5 
10.0 a.m. 
1,250 
S.E. 1. 
64 
g 
Thick.’ 
3j 
1,550 
1,500 
6 
10.30 a.m. 
1,000 
Variable. 
61 
4*" 
Thick.’ 
1,000 
1.0 p.m. 
400 
N.W. 2. 
Clear. 
Clouds on hill tops. 
325 
336 
” 
385 
1.30 p.m. 
303 
60 
6” 
Clear.” 
4.30 p.m. 
205 
99 
250 
i... 
» 
8 
10.0 a.m. 
1,650 
N.W. 2. 
6 if 
9 " 
Medium. 
Cloudy, with occasional showers. 
1,450 
9 
10.0 a.m. 
2,500 
S.0-2 
69’ 
k" 
Medium. 
Dull morning. 
2,500 
” 
2,400 
12.30 p.m. 
1,230 
s.”6-5 
64 
9* 
Clear. 
6.0 p.m. 
2,650 
E. 1 
61 
6 
Thickish. 
10 
11.30 a.m. 
814 
E. 3 
59 
4 
Medium. 
Been raining. 
12 
5,30 p.m. 
710 
S.E. 0-5 
60 
5 
Clear. 
Fine, but cloudy. 
13 
10.30 a.m. 
3,000 
S. 1 
62-5 
5 
Thick. 
Fine morning. 
,, 
3,000 
M 
1.0 p.m. 
2,900 
65 
5 '5 
” 
11.30 a.m. 
3,100 
Variable. 
TT 
15 
425 
56 
4 
Clear. 
Thunder in distance. 
„ 
550 
Carry S.W. 
550 
2.0 p.m. 
1,900 
N.W. 1 
57 
4-5 
Thick.’ 
Air became much thicker. 
1,850 
IT ' 
16 
10.0 a.m. 
1,400 
Variable. 
59* 
6* 
Medium. 
Fine, but clouded. 
1,300 
• 
1.30 p.m. 
800 
62 
7 
Very clear. 
Cany from north. 
,, 
,, 
850 
,, 
,, 
,, 
One of the clearest days at this 
place. 
17 
10.0 a.m. 
' 5io 
E. 0-2 
59 
8 
Very clear. 
Cloudy, carry from north. 
Aug. 
Ben Nevis, . 
1 
•1.0 p.m. 
335 
S.W. 1 
45 
2 
Hazy. 
Fairly clear, Schiehallion and 
! 
3.0 p.m. 
473 
45-5 
2-6 
,, 
Skye hills visible. 
Sept. 
Alford, . . 
5 
11.0 a.m. 
2,000 
Variable. 
7V2 
107 
Thick. 
Dull, foggy morning. 
5.30 p.m. 
1,800 
~ 
6 
10.30 a.m. 
3,850 
E.’l 
71 '2 
1 0*9 
Very thick. 
,, 
7 
10.0 a.m. 
2,7.50 
E. 0-5 
62 
62 
9 
9.0 a.m. 
3,000 
S.W. 1 
68 
101 
Thickish. 
Cloudy. 
Callievar, . . 
,, 
12.0 a.m. 
262 
S.W. 3 
Clear. 
Clouds clearing away. 
336 
2.0 p.m. 
475 
S.W.W. 3 
Clouds nearly gone. 
475 
Alford, . . 
’9 
4.30 a.m. 
900 
S.W.W. 2 
,, 
10 
9.30 a.m. 
1,750 
W. 0-5 
67' ’ 
6’5 
Thickish. 
Dull day. 
,, 
6.0 p.m. 
530 
S.W. 1 
Hazy. 
,, 
” 
11 
10.0 a.m. 
1,125 
Variable 
67* 
59 
Thick. 
Dull morning. 
