Square
number.
Meteorological Observations,—Continued.
147
Jan.
Feb.
Mar.
April.
May. June.
July. August. Sept.
Oct.
Nor.
Dec.
93
63
77
40
45
67
74
79
101
82
ут
95
26
3
26
34
42
67
67
76
35
33
22
155
65
94
120
70
109
99
64
76
62
55
99
$2
147
96
2064
1847
1953
1914
2278
2269
2303
2173
2006
2217
2017
1973
97
913
892
1063
935
1049
1088
999
1019
1056
1091
1133
1058
98
296
285
283
303
360
408
401
399
401
374
383
350
127
168
90
119
114
94
87
150
105
124
143
1:27
91
128
188
103
141
130
109
124
183
156
126
193
165
124
129
217
150
194
210
130
185
183
185
161
209
220
176
130
529
377
459
440
578
581
661
·599
522
541
592
497
131
511
446
474
549
566
631
697
789
512
592
533
452
132
1499
1469
1734
2350
2652
2741
3091
2759
2488
2575
2441
1714
133
0
0
90
103.
133
141
165
104
99
141
117
19
163
151
133
170
233
206
248
259
289
225
217
196
143
164
250
176
248
324
284
379
362
375
377
297
259
187
165
296
186
196
272
358
378
407
381
286
295
216
166
98
64
70
95
131
113
147
98
118
95
88
167
17
12
12
56
74
123
162
90
ΤΙ
42
4
168
3
0
14
15
13
14
199
45
34
33
68
59
37
58
200
11
202
203
318
21
15
319
40
36
24
0
367201
64
55
21230
0
50
0
0
8
28
24
320
7
27
16
13
35
10
20
321
1
1
4
13
15
X
11
322
34
22
36
44
62
64
58
48
62
82
54
34
323
417
243
333
217
210
253
220
213
235
288
323
324
333
256
200
115
92
87
147
144
239
299
342
374
325
300
266
268
389
411
411
566
536
591
367
370
328
18171 16514 18588
18885
20610 21473
23040 22522 21138 21983 20937 18620
8. As stated in the Instructions for making Meteorological Observations, etc.," meteorological observations forwarded by observers who regularly send their registers to the Observatory are verified here free of cost. During the past year 3 barometers, 2 aneroids and 4 thermometers were verified. In addition, several hundred barometers and aneroids on board ship were compared with our standard.
9. The mean values of the spectroscopic rainband (1-5) in 1900 were as follows:--January 1.65, February 1.86, March 2.52, April 2.03, May 2.26, June 2.47. July 2.29, August 2.13, September 2.07, October 1.58, November 1.70, December 1.00. Year 1.96.
10. In 1900 the number of transits observed was 3729. The axis of the transit instrument was levelled 222 times, and the azimuth and collimation errors were determined 17 times by aid of the meridian mark erected in 1884. All these observations, with the exception of 137 transit's made by myself in January, have been made and reduced by Mr. J. I. PLUMMER.
11. The Sidereal Standard Clock by Dent was cleaned on December 13th and its rate during the whole year has been satisfactory. It was found necessary to clean the platinum points of the contact springs on several occasions: viz. ou February 27, April 20, June 19 and August 24. This can be done without interfering with the going of the clock. On August 29 and again on September 3 the springs having been set too low the clock tripped a number of seconds during observations but it was detected at once and the escapement released. Advantage was taken of the cleaning of the clock to reduce the rate sensibly. The Standard mean time clock by Brock has been going uninterruptedly, but its rate is not satisfactory. The time-ball clock calls for no remark.
12. The errors of the time-ball are given in Table II. There was one failure in 1900. The ball is not dropped on Government holidays. On April 28th the Chinese assistant omitted to take the key of the time-ball tower with him. On September 11th the ball was not hoisted in consequence of a strong casterly gale, and from November 10th to November 12th, the telegraph line, having been broken down in the typhoon of the preceding day, was under repair. It was dropped successfully 348 times. The cause of the single failure was that the piston jammed at the top of the cylinder in consequence of the oil having become bardened in the dry weather. The probable error was in January 0.12, in February 6.10, in March ± 0.19, in April ± 0.16, in May. ± 0.10, in June ±0.12, in July 13, in August ± 0.09, in September ± 0.11, in October ± 0.09, in Novem- ber± 0.12, and in December ±0.10.
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