ON EIGHT BALLOON ASCENTS IN 1862. 445 
Tasce IIT. (continued.) 
Temperature of the Air. 
Ascending. Descending. 
Siac macon ; | cal 
u- | aicu- 
level of the sea. |Between|q: 4] Ob- | abated tae ‘Between! oircum-| 2%-, | adopted! lated 
giiat |stances| S204 Meu, fet ol gst Stance] eed (temp. (ie 
ance. ance. 
July Shh ° ° ° ° ° ° 
7000 ° 50 42-8 | 33 =e 44°0} 44:0 o"o 
6000 = d 43°5| 45°5|— 2°0 = z oe 46°0|} 46:0 oo 
5000 2s, | Misty.| 48-2] 48:2 oo eS => 47°4| 47°4 oo 
4000 4,2, 520] 508 )/4+ 12] Ou | «- 4972| 492] oo 
3000 a< 52°7| 53°2|— OS] ga | -* | 541] 54°F) 0 
2000 9 tn 59°5| 57°\+ 2°5|| & - Ar 59:21) | 5972 o°o 
1000 2 62°9} 62°9 oro} * a 63°72) 63°2 role) 
° 707 |) \JO"7 oo = 68:0] 68-0 oo 
August 18. 
12000 | rs ee vs ‘ i) : ee oe . 
11000 E S38 | 392| 380l+-r2]| ¢ rc 4r2| 38-0|+ 3:2 
10000 x So | 418] 39°5 ZEB” Rin 44°5| 40°0 45 
gooo a #2 | 440] 408 3:2|| = = 46°5| 46°3| 47 
8000 4% ego) | 45:2:|1 4200 F°0, S ‘ 50°0| 44°0 6:0 
7000 Ss z= 46°1| 438 pes) 8 5 54°0| 46:0 4:0 
6000 g 29 4772| 45°0 Zp S we 53°5| 48:0 5°5 
5000 s | 82] 485] 465) 20] 4% 52°7| 51°0| 1-7 
4000 ~ |2e| 499) 492)/+ 97] + . 541] 53°5|+ 06 
3000 g I ° 52°8| 52°8 oo|| 7A oe 56°0| 5670 oo 
Bose 3) See SHES. 5745 oro}| .* 
1000 22 | 62:9] 62°9| ool| 8 oe 
° mo 79°9| 70°9 foyfe) . 
On descending, a warm current of air was entered at the height of 24,000 
feet, and extended downwards to 16,000 or 17,000 feet, and the calculated 
effect of this is shown in the 11th or last column on July 17, on the opposite 
page. 
July 30.—There were alternately warm and cold currents at different 
elevations, as the balloon passed down the valley of the Thames; the depar- 
ture from the curved line which was made to pass through the observed 
readings when laid on a large diagram, at times was from 1° to 3° in excess, 
and at other times nearly as much in defect; but in the descent, which was 
rather rapid, there were no disturbing causes in operation. The amounts of 
disturbance in the ascent will be seen at each 1000 feet in the preceding 
Table. 
On August 18 the temperature of the air decreased as usual on leaving the 
earth, until at the height of 4000 feet the rapidity of the decrease was arrested, 
and a warm current of air met with, which continued till the height of 11,500 
feet was reached, when the balloon turned to descend, when the same warm 
current was passed, extending to the same limits ; and was met with again on 
the re-ascension, at about the same distance from the earth, and found to extend 
to the height of 14,000 feet, when the regular diminution was resumed, and 
afterwards continued to the highest point reached: on the second descent, 
the same warm current of air was again met with, and continued till clouds 
were reached at the height of 6500 feet, which caused another interruption 
in the regular increase of temperature, as is usual in entering cloud from 
above, The temperatures of the air at every 1000 feet, as observed, were 
