197
TABLE XVIII,
Average Readings of Solar Radiation Thermometers and Excess over Maximum Thermometers as well as Excess of Minimum over Terrestrial Radiation Thermometers, Mean Weight of Aqueous Vapour in Troy Grains
in each cubic foot of air and Diurnal Range of Temperature at the Observatory and at the Peak, and average height in feet at which the Temperature of the air was 1° lower during 1885.
Solar Radiation Thermometer.
Solar Radiation. Excess over Maximum.
Terrestrial Radia- tion.
Weight of Aque- ous Vapour.
Diurnal Range.
Month.
Height of 1° Decrease.
Observa- tory.
Peak.
Observa- tory.
Peak.
Observa- tory.
Peak.
Observa- tory.
Peek.
Observa- tory.
Peak.
1885.
January,
112.8 107.2
49.8
51.8 +2.5
+1.0
4.24
3.96
7.6
8.7
225
February,
91.4
90.0
33.0
39.0
+2.0
+0.2
3.91
3.64
6.1
5.7
251
March,
113.2 109.5
47.8
48.6
+2.4
-0.1
5.03
4.67
8.3
9.2
397
April,
126.7
121.1
51.7
51.3
+1.3
+1.1
7.23
6.73
8.0
6.9
417
May,
136.5
122.7
55.2
48.9
+2.2 +0,8
8.75
8.08
6.9
4.7
275
June,.
139.0.
127.3
54.2
50.6 +2.9 +0.9
9.36
8.64
7.3
4.5
275
July,
140.3
126.9
55.8
49.1 +2.4
+0.1
9.31
8.80
6.8
4.8
294
August,....
135.6 126.4
52.0
48.9
+2.3
+0.7
9.19.
8.75
7.2
5.0
328
September, 144.3 137.3
61.8
61.0 +2.7
+0.7
8.43
8.12
6.5
October,
November,
139.8 135.6
61.7
62.4
+3.3
+1.3
6.61
6.69
5.7
225
5.7
311
7.2
294
132.0 127.2
60.2
61.9
+ 4.6
++ 2.8
4.60
5.08
7.5
6.3
285
December,...... 124.8 122.3
57.6
61.2
+4.1
+2.5
4.64
4.87
6.9
5.6
322
Mean,
128.0 121.1
53.4
52.9 +2.7
+1.0
6.77
6.50
7.1
6.2
306
H kong Observatory, 16th March, 1886.
W. DOBERCK,
Government Astronomer.