548 Proceedings of the Royal Society of Edinburgh. [Sess. 
Table IV. — Showing the Lowest and Highest Limits of Visibility observed at 
Falkirk for Winds from the Principal Directions, and at Different 
Degrees of Dryness, from 1891 to 1896. 
Direction 
of 
Extreme Limits of Visibility in Miles for Different 
Wet-Bulb Depressions. 
Wind. 
2°. 
3° and 4°. 
5° and 6°. 
7° and over. 
N. 
40 to 80 
120 to 250 
100 to 250 
N.E. 
3 to 40 
5 „ 50 
25 „ 50 
12 „ 100 
E. 
4 „ 15 
5 „ 25 
6 „ 50 
10 „ 50 
S.E. 
12 „ 17 
15 „ 30 
S. 
6 to 10 
10 „ 24 
12 „ 30 
15 to 50 
s w. 
2 „ 12 
5 „ 20 
6 „ 25 
8 „ 60 
w. 
20 „ 60 
20 „ 250 
50 „ 250 
50 „ 200 
N.W. 
30 „ 250 
50 „ 250 
100 „ 250 
Table V. — Showing the Mean Limit of Visibility of the Air at Falkirk for 
Winds from the Different Directions, and for each increase of 2° in the 
Wet-Bulb Depression, for June and July 1910. 
Direction 
of 
Wind. 
2 
3° and 4°. 
5° and 6°. 
7° and over. 
Number 
Limit 
Number 
Limit 
Number 
Limit 
Number 
Limit 
of Obser- 
of Visi- 
of Obser- 
of Visi- 
of Obser- 
of Visi- 
of Obser- 
of Visi- 
vations. 
bility. 
vations. 
bility. 
vations. 
bility. 
vations. 
bility. 
N. 
1 
150 
N.N.E. 
1 
60 
2 
40 
N.E. 
1 
2-5 
2 
3-25 
E.N.E. 
1 
i-5 
5 
10 
6 
19 
2 
30 
E. 
2 
1-5 
7 
2-5 
8 
3*5 
10 
6 
E.S.E. 
S.E. 
”i 
15 
S.S.E. 
i 
2 
1 
4 
S. 
2 
3-5 
1 
15 
S.S.W. 
S.W. 
6 
io 
1 
6 
w.s.w. 
i 
15 
3 
16 
2 
15 
w. 
i 
100 
2 
45 
3 
77 
W.N.W. 
1 
150 
N.W. 
1 
125 
1 
125 
N.N.W. 
1 
100 
