SUPPLEMENT TO THE HONGKONG GOVT GAZETTE OF 17TH APRIL, 1886. 313
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 1o lower during 1885.
Solar Radiation.
Solar Radiation Thermometer.
Excess over Maximum.
Terrestrial Radia- | Weight of Aque-
tion.
ous Vapour.
Diurnal Range.
Month.
Height of 1o Decrease.
Observa- tory.
Peak.
Observa- tory.
Peak.
Observa- tory.
Peak.
Observa- tory.
Peak.
[Observa- tory.
Peak.
1885.
January,
112.8 107.2
49.8
51.8
+2.5 +1.0
4.24
3.96
February,
91.4
90.0
33.0
39.0
+2.0 +0.2
3.91
3.64
March,
113.2
109.5
47.8
48.6
+2.4 -0.1
5.03
4.67
*
April,
126.7 121.1
51.7
51.3
+1.3
+1.1
7.23
6.73
May,.......
136.5
122.7
55.2
48.9
+2.2 +0.8
8.75
8.08
June,....
139.0
127.3
54.2
50.6
+2.9 +0.9
9.36
8.64
July,
140.3
126.9
55.8
49.1 +2.4 +0.1
9.31
8.80
August,.
135.6 126.4
52.0
48.9 +2.3
+0.7
9.19
8.75
2 3 3 8 3 * * 2
6.8
7.2
5.0
.་་་
September, 144.3 137.3
61.8
61.0 +2.7
+0.7
8.43
8.12
October,
November, 132.0 127.2
December,...... 124.8 122.3
139.8 135.6
61.7
62.4 +3.3 +1.3
6.61
6.69
60.2
61.9 +4.6 +2.8
4.60
5.08
57.6
61.2 +4.1 +2.5
4.64
4.87
82 28
6.5
ཁ་ཆར་
7.6
8.7
225
6.1
5.7
251
8.3
9.2
397
8.0
6.9
417
6.9
4.7
275
7.3
4.5
•
275
4.8
294
328
5.7
311
5.7
7.2
294
7.5
6.3
285
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
Hongkong Observatory, 16th March, 1886.
W. DOBERCK,
Government Astronomer.