504 REPORT—1863. 
TABLE X. 
Excess of Temperature of the Dew- 
point as found by 
| Dry and Wet Thermometers (free) 
above that found by 
Heights between : 
5 a a8 é 
ne sal eee 2 
a8 P| = 
ore ) ae 3 
ae 6 fp & 6 
Ar Z <4. z 
| nee — 
fect. feet. a ‘ 
© to 1000} —1'4 6 —0'5 4 
1000 ~,, 2000/ —o2 22 —o'8 I 
2000 ,, 3000 | —o'5 23 
3000», 4000 —I1'I Lyi 
| 4000 5, 5000; —o'!1 | 8 
5000 ,, 6000 —o'5 12 
6000 4, 7000 | +orr 15 
7000 ,, 8000} -+1'8 I 
| 8000 ,, 9goco | 
| gooo ,, 10000 
| 10000 ,, 11000 | 
| 13000 ,, 12000 | 
12000 4, 13000 
13000 ,, 14000 
14000 ,, 15000 | +2°8 2 
| 15000 ,, 16000 | —2'0 I 
16000 ,, 17000 | —3°6 I —1'9 3 
170090 =, 18000 
| 18000 ,, 19000 | 
19000 ,, 20000 | —2'2 I —2'1 4 
20000 ,, 21000 eeee we +0'°5 I 
21000 ,, 22000 | .... se —-98 I 
22000 ,, 23000 } 
| 23000 ,, 24000 | ..++ a ee +0'5 I 
In all the experiments there seems to be no certain difference in the tem- 
perature of the dew-point as determined by Daniell’s and Regnault’s hygro- 
meters, and no certain difference in the results as found by the dry- and wet- 
bulb free and those by the dry- and wet-bulb aspirated. The most important 
comparison therefore now to be made is the comparison of results by dry- 
and wet-bulb thermometers and with one or the other of the hygrometers. 
The following are the results as found from all the simultaneous determi- 
nations of the temperature of the dew-point by Daniell’s hygrometer and the 
dry- and wet-bulb thermometers (free). 
The temperature of the dew-point by the dry- and wet-bulb (free) up 
to 1000 feet was the same as by Daniell’s hygrometer, from 14 expts. 
From1000 to 2000 feet was 0:1 lower than by a3 
2000 to 3000 feet was 0-1 lower than by 3 
3000 to 4000 feet was 0-1 higher than by x 
4000 to 5000 feet was 0-4 lower than by OS 
5000 to 6000 feet was 0-9 lower than by 5 
6000 to 7000 feet was 0-3 lower than by Pi 
7000 to 8000 feet was 3:5 higher than by 
8000 to 9000 feet there naa been no neat Eye 
9000 to 10, 000 feet was 0°8 lower than by im 
from 29 ,, 
from 44 ,, 
from 50 ,, 
from 30 ,, 
from 28 __s=éz, 
from 26 ,, 
from 2 ,, 
from 1 expt. 
