2 
< Ny 
ON EIGHT BALLOON ASCENTS IN 1862. 
435 
At 11" 7™ the readings of the Dry and Wet (free) were 19°-0 and 9%0, 
giving a dew-point temperature of —67°4; and the readings of the Dry and 
Wet(aspirated) were 18°-2and12°-0, giving a dew- -point temperature of —34°-5 
At 11" 25” the readings of the Dry and Wet (free) were 28°-1 and 17°: 5, 
giving a dew-point temperature of —26%1. 
From the general agreement of the results observed by Daniell’s Hygrometer 
to —10°, by Regnault’s Hygrometer to this and lower temperatures, and those 
of the dew-point as found by the Dry- and Wet-bulb thermometers, there can 
be no doubt that the temperature of the dew-point at heights exceeding 25,000 
feet must have been at least as low as —50°. 
Reading of 
the Barom. 
reduced to 
32°F. 
hm_ sj in. 
29°96 
29°96 
29°87 
29°82 
. 29°80 
29°65 
29°55 
29°50 
29°20 
28°85 
28°65 
28°20 
27°65 
27°10 
. 26°87 
26°50 
26°40 
26°35 
26°27 
26°25 
26°18 
26°12 
26°08 
25°91 
25°80 
25°73 
25°78 
25°85 
25°90 
_ 26°00 
25°98 
25°76 
25°68 
SE Yi 
25°30 
25°40 
25°35 
25°20 
25°20 
25°26 
25°25 
25°20 
25°00 
Seconp Ascent.—July 30. 
Height 
above the 
level of 
the sea. 
feet. 
250 
250 
330 
370 
390 
480 
57° 
615 
890 
1189 
1389 
1829 
2379 
2452 
3161 
3543 
3640 
3690 . 
377° 
3790 
3860 
3920 
3960 
4169 
4279 
4358 
4308 
4234 
4184. 
4084 
(4094) 
4104 
4324 
4403 
4613 | 
4783 
4682 
4733 
4925 
4920 
4863 © 
4873 
4920 | 
5155. 
Temp. 
of the 
Air. 
68-2 
68-0 
67°2 
66°5 
66°5 
66°0 
65°5 
65°2 
63°38 
62°0 
62°0 
59°8 
58°5 
54°2 
52°5 
51°0 
50°4. 
49°8 
50°0 
50°6 
51'0 
52°2 
52°5 
515 
50°0 
50°5 
50°5 
515 
51°8 
51°8 
51°5 
52°1 
515 
52°1 
492 
49°90 
48°5 
48°9 
‘43°2 
43°5 
43°2 
48°2 
479 
.49°3 
Temp. 
of the 
Dew- 
point. 
50°0 
49°7 
48°0 
479 
479 
479 
473 
4571 
449 
43:2 
43°0 
43°5 
42°6 
41°9 
40-4 
39°8 
40°4 
41°0 
39°7 
49°7 
40°0 
39°7 
39°4 
40°3 
39°7 
39°2 
39°2 
40°3 
40°1 
40°1 
39°9 
40°2 
40°7 
39°8 
36°5 
36°7 
38°1 
377 
375 
3772 
373 
38°0 
376 
36°2 
Time of /Reading of} Height 
the Barom.| above the 
observa- 
tion. 
P.M. 
hm. 
5 18 
20 
21 
22 
23 
24. 
30 
30 
30 
reduced to 
32° F, 
— 
in. 
24°93 
24°78 
24°79 
24°95 
24-99 
24°32 
24°78 
24°62 
24°32 
24°47 
24°57 
24°30 
24°22 
24°02 
23°83 
24.00 
24°42 
24°60 
24°53 
24°35 
24°12 
23°82 
23°69 
23°58 
23°50 
23°47 
= As 
23 “40 
23°47 
23°79 
level of 
the sea. 
feet. 
5220 
5379 
5360 
5200 
5200 
533° 
545° 
5830 
553° 
5380 
5280 
5903 
5983 
6183 
(6220) 
6370 
6252 
6785 
5577 
5649 
5846 
6102 
64.66 
6642 
6752 
6826 
6856 
6896 
(6910) 
6937 
6867 
6547 
(6603) 
(6617) 
(6625) 
6637 
6747 
6937 
Temp. 
of the 
Dew- 
point, 
ce 
ans 
37°3 
37-2 
38°9 
37°2 
38°7 
35°9 
35°8 
354 
36°2 
38°4 
35°8 
35°8 
35°8 
34°0 
32°7 
351 
35°9 
364. 
3571 
34°7 
33°71 
34°3 
33°8 
35°2 
314 
32°6 
314 
29°83 
30°3 
32°0 
31°4 
31°6 
32°9 
32°74. 
313 
29°0 
31°8 
31°8 
30°8 
32°4 
32°5 
32°7 
32°8 
