7
Table V.
Errors of Time-Ball in 1897.
93
means too late.
+ means too early,
Date.
Jan.
Feb.
Mar.
April.
May.
June.
July.
Aug.
Sept.
Oct.
Nov.
Dec.
-0.2
0.1
-0.3
+0.2
-0.4
3388
0.1
0.1
0.1
{}.1
0.1
0.1
0.1
0.1
0.1
-0,5
0.1
+0.3
6
+0.3
-0.4
0.1
+0.3
+0.4
-0.3
0.1
8 +0.4
-0.3
-0.2
+0.6
9 +0.6
-0.3
-0.3
10
+0.7
0.1
-0.4
11
+0.8
-0.2
-0.5
12
+0.9
0.1
0.1
-0.2
13
+1.0
0.1
0.1
14
+1.1
+0.2
+0,2
15
0.1
0.1
+0.2
16
+0.4
0.1
0.1
17 +0.8
+0.9
0.1
18
+0.8 +0.2
0.1
19 -0.2 +0.2
+0.2
20 -0.2 +0.2
+0.3
21
0,2 +0.2
+0.4
22
-0.3 +0,2
+0.7
23
-0.3
+0.3 +0.4
24 ·0.4
+0.3
+0.2
25
0,2
+0.2
+0.2
26
0.1
0.1
+0.2
0.1
27
01.1
0.1
+0.2
0.1
28
0.1
+0.2
0.1
0.1
1238 13 : :333333333)
0.1
0.1
0.1
0.1
0.1
+0.2
358338 133333338
8888888888888888838333 :8888
0.1
+0.2
0.1
0.1
+0.4
0.1
+0.5
0.1
+0.4
0.1
0.1
.0.1
0.1
0.1
+0.2
0.1
0.1
-0.2
-0.2
0.1
0.1
0.1
0.1
+0.2
+0.2 +0.8 +0.2
0.1
+0.2
+0.0
+0.4
+0.2
0.1
0.1
0.1
: : :33333335
85538888888888333
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
+0.2
+0.2
0.1
+0.3
+0.2
0.1
+0.8 +0.2
0.1
+0,3
+0.3
0.1
+0.3
+0.3
0.1
+0.2
+0.4
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
-0.2
+0.3
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
+0.2
0.1
0.1
+0.3
0.1
+0.2
+0.3
+0.3
-0.2
0.1
+0.3
0.1
0.1
-0.3
+0.2
+0.3
0.1
0.1
0.1
0.1
+0.2
+0.3
0.1
0.1
0.1
0.1
0.1
+0.3
0.1
0.1
0.1
0.1
0.1
+0.2
-0.2
0.1
0.1
0.1
0.1
+0.2
-0.2
0.1
0.1
0.1
0.1
0.1
-
-0.4
0.1
0.1
0.1
-0.2
0.1
0.1
0.1
-0.2
-0.3
0.1
0.1
0.1
-0.2
-0.2
0.1
0.1
0.1
-0.8
20
0.1
0.1
0.1
0.1
-0.3
0.1
0.1
0.1
-0.2
38338
+0.2
---
0.1
-0.2
0.1
30
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.9
0.1
31
0.1
0.1
0.1
0.1
0.1
0.1
0.1
14. Observations for latitude by Talcott's method have been continued throughout the year and 1359 observations of pairs of stars have been observed, distributed as follows:- In January 101 pairs, in February 61 pairs, in March 7 pairs, in April 51 pairs, in May 134 pairs, in June 26 pairs, in July 144 pairs, in August 152 pairs, in September 165 pairs, in October 147 pairs, in November 230 pairs, in December 141 pairs. The relative numbers give a clear indication of the way in which the atmospheric conditions interfere with astronomical observations in Hongkong. From the 1st June till the 31st December Mr. Plummer made all the observations.
15. The cisterns of the barograph and standard barometers are placed 109 feet above M.S.L. The bulbs of the thermometers are rotated 108 feet above M.S.L., and 4 feet above the grass. The solar radiation thermometer is placed at the same height. The rim of the rain-gauge is 105 feet above M.S.L., and 21 inches above the ground.
16. The monthly Weather Reports are arranged as follows:---
Table I. exhibits the hourly readings of the barometer reduced to freezing point of water, but not to sea level, as measured (at two minutes to the hour named) from the barograms.
Tables II. and III. exhibit the temperature of the air and of evaporation as determined by aid of rotating thermometers. Table II. exhibits also the extreme temperatures reduced to rotating ther- Table III. exhibits also the solar radiation (black bulb in vacuo) maximum temperatures
reduced to Kew arbitrary standard.
Table IV. exhibits the mean relative humidity in percentage of saturation and mean tension of water vapour present in the air in inches of mercury, for every hour of the day and for every day of the month, calculated by aid of Blanford's tables from the data in Tables II, and III.
Table V. exhibits the duration of sunshine expressed in hours, from half an hour before to half an hour after the hour (true time) named.
Table VI. exhibits the amount of rain (or dew) in inches registered from half an hour before to half an hour after the hour named, It exhibits also the estimated duration of rain.