134 
MR. GLAISHER ON THE CORRECTIONS TO BE 
Table VII. — Showing the corrections to be applied to the monthly mean readings 
of the wet-bulb thermometer placed at the height of four feet above the soil at any 
hour, to deduce the true mean temperature of evaporation for the month from the 
observations taken at that hour. 
Local mean 
time . 
January . 
Feb . 
March . 
April . 
May . 
June . 
July . 
August . 
Sept . 
October . 
Nov . 
Dec . 
Midnight . 
+ 0-7 
+ 1-2 
+ 2-1 
+ 2-9 
4 - 3-8 
+ 3-5 
O 
+ 3-1 
+ 2'6 
+ 2-2 
O 
+ 1-9 
O 
+ 1-3 
+ 0-5 
1 A . M . 
+ 0-7 
+ 1-4 
+ 2-0 
+ 3-1 
+ 3-1 
+ 4-2 
+ 3-2 
+ 2-9 
+ 2-8 
+ 1-8 
+ 1-4 
+ 07 
2 
+ 1-0 
+ 1-6 
+ 2'2 
+ 3-4 
+ 4-2 
+ 4-8 
+ 3-5 
+ 3-3 
+ 3-7 
+ 2-1 
+ 1-6 
+ 0-8 
3 
+ M 
+ 1-6 
+ 2-4 
4 - 3-8 
+ 4-4 
+ 5-3 
+ 3-6 
+ 3-4 
+ 4-1 
+ 2-3 
+ 1-6 
+ 0-9 
4 
+ 1-4 
+ 1-8 
+ 2-7 
- f 4 -l 
+ 4-4 
+ 5-8 
+ 3-6 
+ 3-5 
+ 4-5 
+ 2-4 
+ 1-6 
+ 1-0 
5 
+ 1-6 
+ 1-8 
- t - 2-8 
4 - 4-3 
+ 4-2 
+ 5-3 
+ 3-4 
+ 3-7 
+ 4-1 
+ 2-3 
+ 1-5 
+ 0-9 
6 
+ 1-7 
+ 1-9 
+ 2-7 
4 - 3-9 
+ 2-9 
+ 3-5 
+ 2-3 
+ 3-0 
+ 3-2 
+ 2-0 
+ 1-4 
+ 0-8 
7 
+ ]'7 
+ 1-7 
+ 2-6 
- f 2-7 
+ 1-2 
+ 1-2 
+ 1-0 
+ 1-2 
+ 2-1 
+ 1-5 
+ 1-1 
+ 1-0 
8 
+ 1*3 
+ 1-3 
+ 2-0 
- hi -0 
- 0-1 
- 0;7 
- 0-6 
- 0-3 
+ 0-9 
+ 0-4 
+ 0-5 
+ 0-9 
9 
- t - 0-8 
+ 0-7 
+ 0-3 
- 1-0 
- 3-7 
— 2-1 
- 1-6 
- 1-7 
- 0-8 
- 0-7 
+ 0-2 
+ 0-6 
10 
0-0 
- 0-3 
— 1-3 
- 2-3 
- 3-0 
— 3-1 
- 2-6 
— 2-6 
- 2-5 
- 2-0 
- 0-4 
0-0 
11 
- 1-4 
- 1*6 
- 2*5 
-. 3-6 
- 3-8 
- 3-4 
— 3-2 
— 3-6 
- 3-6 
- 3-0 
— 1-5 
- 0-8 
Noon . 
- 2*1 
- 2-5 
— 3-6 
- 4-3 
- 4-2 
— 4-0 
— 3-5 
- 3-9 
— 4-3 
- 3-7 
- 2-3 
— 1-4 
1 P . M . 
— 2 ‘ r > 
- 3-0 
— 4-0 
- 4-8 
- 4-4 
— 4-2 
- 3-6 
— 4-3 
— 4-4 
- 3-7 
- 2-5 
- 1-6 
2 
— 2-4 
- 2-9 
- 3-9 
- 4-8 
- 4-3 
- 4-4 
- 3-6 
— 4-5 
- 3-9 
- 3-0 
- 2-6 
— 1-5 
3 
— 1-8 
2*4 
— 3-6 
— 4-5 
- 4-0 
- 4-6 
— 3-4 
- 3-9 
— 3-1 
- 1-9 
— 2-3 
— 1-3 
4 
- 1-2 
- 2-1 
— 2*8 
- 3-9 
— 4-4 
- 4-7 
— 3-3 
— 3-0 
- 2-6 
- 1-2 
- 1-6 
- 1-0 
5 
- 0-6 
— 1-4 
- 1-9 
— 3-0 
- 2-6 
- 3-6 
— 2-6 
— 1-3 
- 2-4 
- 0-9 
- 0-9 
- 0-6 
6 
- 0-2 
- 0-7 
— 1-0 
- 1-8 
— 1-4 
- 2-7 
- 1-9 
- 0-5 
- 1-9 
- 0-7 
— 0-3 
- 0-6 
7 
— 0-2 
0-0 
- 0-3 
- 0-4 
- 0-4 
- 1-5 
- 0-8 
+ 0-3 
- 0-9 
- 0-1 
- 0-1 
- 0-4 
8 
- 0-1 
+ 0-2 
- f - 0-6 
4 - 0-5 
+ 0-8 
0-0 
+ 0-2 
+ 1-0 
+ 0-1 
+ 1-2 
+ 0-3 
— 0-2 
9 
+ 0-2 
+ 0*5 
+ 1-2 
4 - 1-2 
+ 1-4 
+ 0-7 
+ 1-1 
+ 1-4 
+ 0-4 
+ 0-6 
+ 0-7 
+ 0-1 
10 
-f 0-3 
+ 0-8 
+ 1-6 
-f 1-8 
+ 2-3 
+ 1-7 
+ 2-0 
+ 1-5 
+ 1-0 
+ 1-0 
+ 0-9 
+ 0-2 
11 
+ 0-4 
+ 1-0 
+ 1-8 
4 - 2-4 
+ 3-0 
+ 2-6 
+ 2-5 
+ 2-1 
+ 1-5 
+ 1-3 
+ 1-1 
+ 0-5 
Table VIII. — Showing the corrections to be applied to the monthly mean reading of 
the temperature of the dew-point at the height of four feet above the soil at any 
hour, to deduce the true mean temperature of the dew-point for the month from 
the observations taken at that hour. 
Local 
mean time . 
January . 
Feb . 
March . 
April . 
May . 
June . 
July . 
August . 
Sept . 
Oct . 
Nov . 
Dec . 
Midnight . 
+ 0-6 
+ 0-8 
+ 0-9 
+ 1-4 
+ 2-5 
+ 2-2 
O 
+ 1*7 
O 
+ 1-5 
O 
+ 1-4 
o 
+ 1-0 
O 
+ 1-1 
+ 0-5 
1 A.M. 
+ 0'8 
+ 1*1 
+ 0-7 
+ 1-4 
+ 2-8 
+ 2-6 
+ 1-6 
+ 1-4 
+ 1-6 
+ 0-8 
+ 1-3 
+ 0-6 
2 
+ 1-2 
+ 1-3 
+ 1-0 
+ 1-5 
+ 2'9 
+ 3-3 
+ 1-7 
+ 1*7 
+ 2-4 
+ 1-0 
+ 1-5 
+ 0-8 
3 
+ M 
+ 2-2 
+ 1-2 
+ 1-7 
+ 2-9 
+ 3-6 
+ 1*9 
+ 1-8 
+ 3-1 
+ 1-0 
+ 1-4 
+ 0-8 
4 
+ 1-3 
+ 2-1 
+ 1-4 
+ 2-0 
+ 2-9 
+ 3-9 
+ 2-0 
+ 1*9 
+ 3-1 
+ 1*1 
+ 1-4 
+ 0-5 
5 
+ 1-2 
+ 0-9 
+ 1-5 
+ 2-2 
+ 2-5 
3*5 
+ 1-8 
+ 2-0 
+ 2-8 
+ M 
+ 1-2 
+ 0-4 
6 
+ 1-2 
+ 1-0 
+ 1-5 
+ 2-3 
+ 1-5 
+ 2-0 
+ 1-4 
+ 1-7 
+ 2-2 
+ 1-2 
+ 1-0 
+ 0-4 
7 
+ M 
+ 1-0 
+ 1-6 
+ 1-8 
+ 0-8 
+ 1-0 
+ 1-5 
+ 0-8 
+ 1-8 
+ 1-1 
+ 0-8 
+ 0-5 
8 
+ 0-7 
+ 0-6 
+ 1-4 
+ 0-4 
- 0-4 
- 0-8 
- 0-1 
— 0-2 
+ 0-5 
+ 0-4 
+ 0-2 
+ 0-4 
9 
+ 0-3 
+ 0-2 
+ 0-1 
— 1-0 
- 1-6 
— 1-5 
- 0-6 
— 1-4 
- 0-8 
— 0-3 
+ 0-1 
+ 0-2 
10 
- 0-2 
— 0-2 
— 1-1 
- 1-6 
- 2-3 
- 1-8 
- 1-3 
- 1-7 
— 2-1 
— 1-5 
— 0-5 
- 0-2 
11 
— 1-1 
— 1-1 
- 1-7 
— 2-1 
2-4 
— 1-8 
- 1-6 
— 2-1 
- 2-5 
— 2-1 
— 1-5 
- 0-9 
Noon . 
- 1-5 
— 1-8 
— 2-3 
— 2-4 
— 2-6 
- 2-3 
- 1-9 
— 2-1 
— 2-6 
— 2-3 
- 2-0 
- 1-4 
1 P.M. 
- 1-9 
- 2-0 
— 2-5 
- 2-6 
— 2-6 
- 2-3 
— 2-0 
- 2-3 
— 2-6 
— 2-0 
- 1-8 
- 1-3 
2 
— 1-5 
- 1*7 
— 2-0 
- 2-3 
- 2-5 
— 2-4 
- 1-7 
- 2-3 
- 2-3 
— 1-0 
- 1-6 
— 1-1 
3 
- 0-8 
- 1-7 
— 1-8 
- 1*9 
— 2-4 
— 2-5 
- 1-6 
— 2-2 
— 2-0 
0-0 
- 1-2 
- 0-6 
4 
- 0-3 
— 1-3 
— 1-2 
- 1-9 
— 2-0 
— 2-4 
- 1-6 
— 1-3 
- 1-7 
0-0 
- 0-9 
- 0-3 
5 
- 0-4 
- 0-9 
- 0-6 
— 1-5 
— 1-5 
- 2-1 
— 1-5 
— 0-2 
- 1-6 
0-0 
— 0-5 
- 0-1 
6 
- 0-4 
- 0-8 
- 0-1 
- 0-7 
— 0-8 
- 1-6 
— 1-1 
+ 0-3 
— 1-1 
0-0 
— 0-2 
0-0 
7 
- 0-9 
— 0-5 
- 0-2 
0-0 
0-0 
— 0-5 
— 0*5 
+ 0-3 
— 0-4 
0-0 
+ 0-1 
0-0 
8 
- 0-7 
- 0-4 
0-0 
0-0 
+ 0-8 
+ 0-4 
+ 0-2 
+ 0-3 
0-0 
0-0 
+ 0-4 
0-0 
9 
— 0-5 
- 0-2 
+ 0-2 
+ 0-8 
+ 0-9 
+ 0-7 
+ 06 
+ 0-4 
+ 0-1 
+ 0-1 
+ 0-5 
+ 0-1 
10 
- 0-3 
0-0 
+ 0-5 
+ 1*1 
+ 1-7 
+ 1-2 
+ 0-9 
+ 0-4 
+ 0-3 
+ 0-3 
+ 0-7 
+ 0-1 
11 
- 0-1 
+ 0-3 
+ 0-4 
+ 1-0 
+ 1-8 
+ 1-4 
+ 1-2 
+ 0-6 
+ 0-6 
+ 0-5 
+ 0-8 
+ 0-2 
The sign + denotes that the number is to be added, and the sign — denotes that 
the number is to be subtracted. 
