31
-----
Table I. Continued.
Square
number.
བསྒ༑
Jan.
Feb.
Mar.
April. May.
June.
July. August. Sept.
Oct.
Nov.
Dec.
320
4
7
16
26
23
51
21
10
7
30
2
10
321
0
1
0
14
19
15
2
15
20
22
18
14
322
53
31
41
60
84
70
79
60
85
82
64
41
323
461
262
361
243
248
187
312
238
232
256
306
334
324
404
322
230
145
100
111
155
174
266
374
449
387
325
357
305
362
448
463
505
582
619
655
480
410
344
326
0
0
0
0
0
1
0
0
0
0
24480 23950 22015
20144 18026 20450 20519 22262 22922
23361 22645 19918
10. As stated in the "Instructions for making Meteorological Observations, etc.," meteorological instruments forwarded by observers who regularly send their registers to the Observatory are verified here free of cost. During the past year 1 barometer and 2 aneroids were verified. In addition, several hundred barometers and aneroids on board ship were compared with our standard.
11. In 1902, the number of transits observed was 2,842. The axis of the transit instrument was levelled 235 times and the azimuth and collimation errors, which are less liable to variation, were determined 20 times by aid of the meridian mark. The whole of the observations have been made and reduced by Mr. J. I. PLUMMER and are now ready for the press.
12. The standard sidereal clock by DENT continues to give perfect satisfaction and has undergone no alteration during the year. The platinum points of the contact springs were cleaned once only, viz., on September 30. The expectation mentioned in the last annual report that the going of the Brock Clock would be improved by the alterations effected in 1901 has not been realized. The time- ball clock and the chronograph are in good condition, the latter having been cleaned on March 18th.
13. The errors of the time-ball are given in Table II. The ball is not dropped on Sundays nor Government holidays. There was one failure in 1902, viz., on July 5, owing to a defective cell in the clock circuit, and on two days, viz., on July 18 and August 12, it was deemed inadvisable to hoist the ball in the prevalence of bad weather. On August 5 and 6 the line was under repair having been broken down in the typhoon of August 2. The ball was dropped successfully 293 times in 1902. The probable error was in January ±0.10, in February ± 0.09, in March±0.09, in April+0.15, in May ±0.18, in June±0.15, in July+0.14, in August±0.09 in, September + 0.09, in October +0.09, in November ±0.13 and in December± 0.15.
Table II.
Errors of Time-Ball in 1902.
Date.
means too late.
Jan. Feb.
Mar.
April. May.
+ means too early.
June. July. August. Sept.
Oct.
Nov.
Dec.
12 20 THG 101-
0.1
0.1 +0.7
3
22:
0.1
0.1
-0.2
0.1
0.1
8
0.1
9
0.1
10
0.1
11
0.1
12
13
0.1
14
0.1
15
0.1
16
0.1
17
0.1
18
+0.2
19
20
0.1
21
-0.2
22
-0.2
23
0.1
24
0.1
25
0.1
26
27 i 0.1
28
0.1
29
0.1
30
0.1
31
0.1
133888 ⠀ ⠀ 133833 1833388 138388.
+0.7
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
-0.2
+0.2
0.1
0.1
0.1
0.1
0.1
0.1
-0.2
0.1 -0.3
0.1
-0.2
0.1
0.1 -0.3
0.1
0.1
0.1
332 1233888 188282
0.1
0.1
**
0.1
+0.8
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
0.1
0.1
0.1
0.1
0.1
0.1
+0.2
0.1
+0.3
0.1
0.1
+0.6
+0.4
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 -0.3
0.1
0.1
0.1
-0.5
0.1
0.1
0.1
0.1
0.1
-0.4
0.1
0.1 +0.2
0.1
0.1
0.1
0.1
0.1
-0.2 +0.4
0.1
+0.4
0.1 +0.5 0.1 +0.6 0.1 +0.7 +0.7
0.1
0.1
38 18 188888819992
0.1
23 : 18 13222
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 +0.3
0.1
0.1
+0.5
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
0.1
+0.3
0.1
0.1
+0.5
0.1
0.1
+0.6
0.1
0.1
0.1 +0.3
0.1
0.1
+0.5
0.1
0.1
0.1
0.1
0.1
-0.2
0.1
0.1
0.1
0.1
0.1
0.1
0.1
-0.3
0.1
0.1
0.1
0.1
0.1
0.1
0.1
+0.2
0.1
0.1
0.1
0.1
0.1
-0.2
188888 1888888 :
0.1
0.1
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
0.1
1333333 133
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
0.1
0.1
0.1
0.1
0.1
0.1
0.1
+0.3
0.1
+0.2
0.1
0.1
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