ON EIGHT BALLOON ASCENTS IN 1862. AAT, 
Srvenrn Ascent.—September 5 (continued). 
| 
Time of |Reading of} Height T 5 | ee 8 f |Readi f| Height T . 
observa- |the ey tage the nd of the dieerta: shafBaron, above the M5 aa of ‘the 
tion. reduced to} level of wes Dew- tion. reduced to} level of "4 © | Dew- 
P.M. 32°F, the sea. * | point, P.M. 32°F, the sea. a point. 
hm_s s| in. feet. a = hm_s s!/ in feet. zs : va 
214 o| 18:06 | 13520 | 24°5 PP GS Hi} 5 Ge (6590) 
TA. 30|. x... (13210) | 24:8 ZG) UG sate 'ate (6560) | 45:2 | 21°5 
15 0} 18-46 | 12900 os (oe) ZO" (Geol ate (5655) | 45°5 | 27:0 
16 oO} .... 12250 | 26°5 29 30) 24°51 5500 | 47:0 | 21°38 
16 50) 20°65 | 10070 | 31°! Z030|ie serene (5110) | 47°r | 35°1 
Ty AONE jess 5< (8800) | 34°2 31 30| | ieerere (4720) | 49:2 | 19°7 
1g 30} 21°85 8530 32 o| 25°40 4521 | 48-0 
BY IG) va,» <0 (8400) | 3572 92) F0|eeee ade (4315) | 50°5 | 20°8 
20 20] 22°04 8310 33 0] 25°80 4110 
20 40] 22°24 8090 | 401 | 15°2 SAG el ie eae (4050) | 51-1 | 22°3 
on OW tests + (7860) | 42:2 | 17°3 | 3G) lola terras (3795) abo es telegas 
23 20) 22°64 7625 | 40°0 | 20°0 38 o| 26-40 3484 | 52°2 | 37°70 
23 50] 22°93 7260 | 40°0 39 0o| 27°60 2260 
24. | 23°03 7150 39) 2Cle vente Shoe 54°0 | 4271 
25.0} (23°95 6810 | 42°0 3. (6), Noles on the | 57°2 | 48°8 
26 0} 23°47 6640 ground 
The reading of Regnault’s hygrometer at 1" 45™ was reduced to —30°, 
without any deposition of moisture; the temperature of the dew-point was 
therefore at a lower degree. At 1" 48™ the temperature of the dew-point, 
as determined by the Dry- and Wet-bulb thermometers, was — 35°, as shown 
below. 
At 1" 37™ the readings of the Dry and Wet thermometers (aspirated) were 
15°-5 and 11°-3, giving a dew-point temperature of —21°-1. 
At 1" 37™ 10° the readings of the Dry and Wet thermometers (free) were 
15°-0 and 11°1, giving a dew-point temperature of —18°1. 
At 1" 37™ 50° the readings of the Dry and Wet thermometers (free) were 
14°-5 and 10°2, giving a dew-point temperature of —13°-0. 
At 1" 38™ the readings of the Dry and Wet thermometers (aspirated) were 
14°-2 and 10°-5, giving a dew-point temperature of —18°1, 
At 1" 38" 10° the readings of the Dry and Wet thermometers (free) were 
13°-2 and 10°-0, giving a dew-point temperature of —14°-8. 
At 1° 39™ the readings of the Dry and Wet thermometers (free) were 
8°-0 and 4°°5, giving a dew-point temperature of —22°-7, 
At 1" 40™ 15% the readings of the Dry and Wet thermometers (free) were 
10°-2 and 8°1, giving a dew-point temperature of —8°2, 
At 1° 40™ 30° the readings of the Dry and Wet thermometers (aspirated) 
were 9°°5 and 7°8, giving a dew-point temperature of —5°3. 
At 1 44” the readings of the Dry and Wet thermometers (free) were 8°-1 
and 4°2, giving a dew-point temperature of —26°-0. 
At 1" 45™ the readings of the Dry and Wet thermometers (aspirated) were 
7°°3 and 4°-5, giving a dew-point temperature of —17°3. 
At 1" 48™ the readings of the Dry and Wet thermometers (free) were 0°-0 
and —4°:0, giving a dew-point temperature of —35%2. 
At 2" 9" the readings of the Dry and Wet thermometers (free) were 17°-0 
and 11°-0, giving a dew-point temperature of —34°-7, 
At 2" 10™ the readings of the Dry and Wet thermometers (free) were 225 
and 15°-8, giving a dew-point temperature of —27°-0. 
From the general agreement of the results as observed by Regnault’s hy- 
grometer 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 30,000 feet must have been as low as —50°. 
