280
During the past year the indications of a bright bulb solar radiation maximum thermometer in vacuo have been registered daily at 10 p. The readings are exhibited below. This thermometer was compared at Kew with the readings of the black bulb in vacuo and with the maximum air-temperature. The results of the comparisons, about 360 in number, were kindly communicated to me by Mr. WHIPPLE, the Director of the Kew Observatory. Compared to the black bulb in vacuo the bright bulb reads possibly a little higher in Hongkong but the results in both places are really alike within the probable error of such observations. At Kew it was compared with the maximum temperature in the thermograph-screen and at Hongkong with the same but corrected by aid of eye-observations of thermometers rotated hourly. At Hongkong the bright-bulb thermometer readings exceed the air- temperature by a larger amount than at Kew owing to the smaller daily range of temperature. In England maximum air-temperature corresponding to a certain mean daily temperature is much greater than within the tropics.
BRIGHT BULB SOLAR RADIATION MAXIMUM THERMOMETER COMPARISONS.
Mean Difference.
Black Bulb.
Mean Difference.
Air Max.
Kew.
Hongkong.
Kew.
Hongkong.
80°
-18°
90°
- 24°
100°
- 28°
- 26°
110°
-30°
-31°
120°
35°
-32°
130°
36°
140°
-34° 35°
1111888
60°
+19°
+18°
7.0°
+19°
+21°
80°
+18°
+ 22°
Date.
1886.
SOLAR RADIATION BRIGHT BULB MAXIMUM TEMPERATURE IN 1886.
May.
June.
July.
August.
September.
October.
November.
December.
O
Q
Q.
O
O
1,
88.7
2,
78.7 88.9 98.4 95.3 86.7 62.3 88.3 100.6
92.9
109.3
113.6
110.4
101.2
93.8 86.8
97.6
90.3
111.0
109.3
108.1 106.1 94.3 86.1
3,
88.3
60.1 92.3
4,
86.4
58.1
91.8 82.8 99.4
110.6
5,
84,9
61.7
64.7 102.7
6,
77.4
90.4
83.9
99,0
7,
91.1
76.7
84.3 98.9
8,
90.2
78.9
89.8
9,
102.3
70.7
10,
11,
92.4
12,
79.6
13,
84.6 72.6
14,
91.2 80.8
15,
80.7
16,
76.3
17,
80.7 59.5
18,
79.7 57.2
19,
85.6
70.9
20,
80.2
78.8
21,
68.8
71.8
22,
76.3
81.4
23,
92.2 83.2
24,
66.7 73.4
25,
65.8
26,
63.1
27,
69.8
28,
67.2 77.7
29,
55.6
30,
78.3
31,
77.8
92.8 105.8 97.3 104.8 107.6 106.9 114.3 110.6 101.7 108.1 109,8 100.9 105.7 109.0 98.3 97.7 105.2 87.3 90.7 94.1 96.8 110.1 97.8 90.6 57.7 77.8 101.3 77.8 111.2 112,6 110.8. 106.0 107.7 62.0 87.8 98.7 94.4 102,1 108.2 110.7 105.6 108.8 71.5 89.4 86.8 103.9 99.8 106.8 110.1 110.7 106.2
98.7 78.8 104.3 83.7 110.3 107.3 111.8 102.2 96.1 82.8 79.3 110.0 92.7 104.6 109,8 110.2 103.9 70.1 90.6 87.8 103.7: 107.6 81.2 105.8 107.6 100.3 70.3 89.7 73.4 107.5 109.2 90.3 99.8 111.9 103.7 93.6 73.8 108:7 109.8 86.6 106.7 113.0 102.0 91.4 91.2 108.2 105.8 82.6 110.6 112.6 102.3 94.3 92.3 108.3 94.3 102.8 109.3 112.9 104.7 91.6 88.4 91.5 83.7 110.5 106.6 106.1 113.2 106:6 107.8 96.0 95.8 92.7 109.1 109.3 105.2 110.1 109.8 107.8 100.4 68.7 93.9 79.8 87.7 106.3 106.6 110:8 113,81 99.6 96.3 58.9 93.6 90.3 108.0 110.1 110.3 108.7 112.4 101.4 91.3 65.2 91.6 109.6 110.7 107.9 111.3 103.3 99.8 89.8 76.1 64.7 97.2 106.1 107.3 110.8 105.6 102.7 105.2 99.4 86.7 88.7 76.0 91.6 103.5 111.1 109.1 79.4 103.8 104.3 96.5 85.6 80.6 69.3 94.6 96.4 110,5 108.6 103.3 102.2 99.3 90.6 84.8 83.8 72.7 102.4 112.9. 112.7 106.0 101.8 101.3 94.2 85.2 82.0 94.2 107.7 107.3 109.3 107.7 102.7 107.2. 101.8 90.2 102.3 111.2 108.3 108.6 110.4 102.0 98.3 88.6
97.7
109.9 107.9
108.7
110.6
109.1 107.7
95.9
86.5
110.6 112.2 110.4 94.0
97.4
89.6
106.0 117.6 107.9 103.7 110.7
99.1
93.5
102.2
92.7
104.9 101.6
99.1
91,1
114.3
109.1: 103.3
95.0
86.7
110.5 93.6 103.4
97.4
86.5
100.0
89.8
96.7
87.1.
94.9 83.1
72,2
93.4
91.9
98.3
86.3
96.1
84.6
98.9 83.6
96.3 90.7
89.8
76.8
87.4
82.2
89.7
69.6
97.8
86.7
Mean,......
80.6 72.2
85.7 91.2
102.3 104.8
104.6 108.7 107.6 103.2
96.1
84.5
*
Below Black Bulb,
Above Air Max.,..
31.4 26.1 31.5 30.6
18.5 15.8 20.0
18.9
35.5 33.8
22.7
33.5
36.7 36.3 35.3
36.4
32.6
21.5
20.4 23.2 23.8 23.0
23.1
20.3