Date.
Table VI.
Errors of Time-Ball in 1896.
99
means too late.
+ means too early.
Jan.
Feb.
Mar.
April.
May.
June.
July.
Aug.
Sept. Oct.
Νον.
Dec:
S.
S.
8.
$.
S.
3.
5.
S.
1
+0.3
-0.5
2
+0.3
T
-0.4
22
0.1
0.1
0.2
0.1
0.1
0.1
-0.2
0.1.
3
+0.4
+0.4
0.1
0.1
-0.3
0.1
38:
0.1
0.1
0.1
+0.4
0.1
+0.3
0.1
0.1
0.1
-0.4
5
-0.3
0.1
0.1
0.1
0.1
0.1
-0.5
6
-0.3
-0.3
+0.2
+0.2
-0.2
0.1
-0.6
7
0.1
-0.4
+0.3 +0.5
*
+0.3
0.1
0.1
-0.4
.8888888
S.
S.
S. 43
0.1 +0.2
0.1
0.1
0.1
0.1
-0,2
+0.2
0.1
0.1
+0.3
0.1
0.1
-0.2
0.1
-0.2
0.1
-0.4
0.1
-1.0
0.1
0.1
0.1
0.1
8
+0.2
-0.3 +0.5 +0.3
+0.2
0.1
0.1
0.1
0.1
+0.3
0.1
-0.2
9
0.1
-
-0.2 +0.5 +0.3
+0.3
-0.2
0.1
+0.5
+0.6
0.1
0.1
10
0.1
-0.2
+0.5
+0.6
0.1
-0.2
0.1
0.1
+0.2
0.1
+0.2
0.1
11
0.1
-0.2
+0.5
0.1
0.1
0.1
0.1
0.1
---
-0.2
0.1
0.1
12
0.1
-0.2
+0.5
+1.4
0.1
0.1
0.1
0.1
0.1
-0.5
+0.2
0.1
13
0.1
+0.6 +1.4
0.1
-0.2
0.1
0.1
0.1
-0.6
+0.3
-0.2
14
0.1
-0.3
+0.4
+0.3
0.1
0.1
0.1
0.1
+0.2
0.1
+0.3
-0.2
15
0.1
-0.2
+0.2
+0.2
0.1
-0.2
0.1
0.1
-0.2
-0.2
+0.4
-0.2
16
0.1
-0.2
+0.2
0.1
0.1
0.1
0.1
0.1
-0.3
0.1
+0.3
-0.8
17
0.1
-0.3
0.1
0.1
+0.2
0.1
0.1
+0,2
-0.4
0.1
0.1
0.1
18
0.1
-0.2
0.1
0.1
+0.3
0.1
0.1
0.1
-0.5
+0.2
-0.2
0.1
19
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
-0.7
0.1
-0.2
0.1
20
-0.2
0.1
+0.2
0.1
0.1
0.1
0.1
0.1
0.1
0.1
.0.3
-0.2
21
0.1
0.1
0.1
0.1
0.1
.0.1
0.1
0.1
+0.3
-0.4
0.1
-0.2
22
0.1
0.1
0.1
0.1
0.1
23
0.1
0.1
0.1
0.1
0.1
-0.2
24
0.1
0.1
0.1
0.1
0.1
25
0.1
0.1
0.1
0.1
26
+0.2
38333
0.1
0.1
-0.2
+0.2
+0.2
0.1
27
+0.3
-0.2
0.1
+0.2 +0.3
0.1
28
0.1
-0.3
0.1
+0.3
+0.2
29
0.1
-0.4
0.1
+0.3
0.1
+0.2
38888888
0.1
0.1
0.1
0.1
0.1
-0.2
-0.2
0.1
-0.2
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0:1
0.1
0.1
0.1
0.1
+0.2
0.1
0.1
0.1
+0.2
+0.2
0.1
0.1
0.1
0.1
30
+0.2
-0.2
0.1
0.1
0.1
0.1
0.1
0.1
31
+0.2
0.1
0.1
0.1
0.1.
33333 :
0.1
0.1
+0.2
0.1
0.1
+0.2
+0.3
19. For the determination of the latitude of the Colony and of the changes to which it may be subject a catalogue of upwards of 200 Hongkong zenith-stars based upon the latest and best observa- tions made in a number of European observatories was constructed. In such work Mr. PLUMMER'S assiduity and scrupulous accuracy in astronomical calculations do excellent service. Since the 28th September 510 observations, of pairs of stars have been made with the transit-instrument after Talcott's method by Mr. PLUMMER and myself.
20. The time would appear to have come when this Observatory should be supplied with a larger transit-circle, the same as used in all the other observatories. Such is required for the local time- service, for determinations of geographical positions in the Far East, and for many other important
purposes.
21. In October last Dr. WITTRAM of the Imperial Observatory, Pulkovo, near St. Petersburg, called at Hongkong and determined with great care the constant of gravity at this Observatory by aid of Colonel VON STERNECK's pendulums. On three different occasions lately officers of three different Austrian men-of-war have made similar observations here, so that the constant of gravity relatively to Vienna will be known with great accuracy.
22. 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.
23. 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 thermometer. 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.
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