~~ ee a ee ae 

Vol. IV, No. 2.] Note on the calm region in the atmosphere, etc, 47 
[WV.S.] 
or from the horizontal position curve, it may be readily seen that 
not only is the air, at the height the balloon was then, at very 
nearly in a state of rest, but that above 4,000 feet altitude there 
is quite a different wind direction from what there is below 3,000, 
In fact the directions are almost diametrically opposite. Between 
observation No, 4 and No. 5 the wind is from the north-east, and 
that between No. 5 and No. 6 from the ont west. After passing 
the 4,000-foot altitude the westerly wind becomes more rapid, a 
oscillates about a direction a little to the north of we est, that is, up 
to a height of about 7,000 feet. For higher altitudes the direction 
tends to become almost due west, but it is very exceptional for 
the balloons of the size [ ere used, and with the gas at my dis- 
osal, to rise above 7,600 feet. On one occasion only did the 
observations indicate a height of about 10,000 feet, and then the 
balloon was moving eastward. 
Tas.e I, 
Table giving — etc., for eign _ 1907, correspond- 
ing to the curves in Plate I. 














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4 8 29°5 78 26 6. 2,800 | 4, 4 
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on ae 25:9 "3 35 7,300 | 4,200; 6000; 7 
8 16 24, 61 37 7800 | 4,700} 6,200 8 
9 18 19°7 32 9, 5,100 | 8,200 9 
10 | 20 17°5 38 29 | 11,000} 5,500} 9,800} 10 
1 22 14:3 33 26 3 5,800 | 12,000; 11 
12 24 12°6 24—30 | 15000} 6,100/ 13,500; 12 
13 26 10°5 21 21 | 18,000 : 16,500 | 18 
14 | 98 $2 17 \17—80 | 23000] 6,700| 22,000] 14 
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: 32 7-0 14 |15—80 27,000 7,300 | 26,500 uy 
34 6°7 13 28, ’ 
18 36 63 14 |14—15 | 30,000| 7,200 | 29,500 18 













