96
16. 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 3 barometers, 3 aneroids and 7 thermometers were verified. In addition several hundred barometers and aneroids on board ship were compared with our standard.
17. The following table shows the spectroscopic rainband as observed daily at about 10 a. mean value for the
ས year was 2.1:-
The
Table III.
Rainband in 1896.
Date.
Jan. Feb. Mar.
April. May. June.
July.
Aug, Sept.
Oct. Nov. Dec.
1,
2,
3,
4,
5,
6,
•
7,
8,
16,
17,
27,
28,
29,
30,
18,
19,
20,
2
3
1
21,
1
22,
1
23,
2
24,
25,
2
26,
INNON N N N ∞
2
3
3
9,
10,
11, .....
12,
13,
14,
15,
-OI2NNNNNHHNNNNNNNN -
1
2
2
0
1
1
1
3
2
2
31,
3
::
3
3
3
2
NNNNN N N N ∞ 30 10 20 21 ∞ ∞ ∞ ∞ ∞ ”NNANNNNNNNN
5
2
2
2
2
GIẢ ỔI GIỐNG NGANG ỐNG GANG CÓ GĐ CÔNG
2 2
3
2
3
3
2
2
2
2
3
3
2
3
IN 20 60 60 DO IN ∞ ∞ að sei allen NNNNN en en en en en en en EN 60 61 62 ON NO
3
3
2
2
2
2
ON O∞ N N ∞ ∞ THAN ON ON ON ON IN ONNNNNNNNN EI 60 60 660 N N
2
2
2
3
2
2
2
2
3
NNN∞ ON N N N N N N N NNNNNNNNNNNNN MO EN ED CO EN DO E CON
3
3
2
2
3
2
2
1
3
NNN--0--0--O
1
NNNNNNNNHHNN-22
3
1
1
1
1
1
NNNN co co co co co co en HNNNNNA – N~~-~~-HAAN
2
1
1
1
1
1
2
2
2
:
Mean,...... 1.7
2.4
2.2
2.3
2.2
2.7
2.3
2.2
2.4
2.1
1.4
1.1
.
18. Mr. PLUMMER observed 455 transits in 1896, and the axis of the transit instrument was levelled 170 times, or on each occasion when observations were made.-The rates of the standard clocks are shown in the following tables. Towards the end of April the rate of the standard sidereal clock having been greatly accelerated it was cleaned upon May 1, and after the lapse of a few weeks a steady rate was re-established. On August 4th the clock tripped 6 seconds owing to an irregularity in the length of the teeth of the wheel which makes the electrical contacts, and it was found necessary to file some of them slightly. On September 22 the action of the contact springs being again unsatis- factory they were cleaned and their surfaces polished, and advantage was taken of the opportunity to alter the rate of the clock. On December 17 the clock was found to have again tripped several seconds, and the adjustment of the springs was therefore altered, but on December 30 the clock was found to have stopped, the springs again pressing too closely upon the toothed wheel. This was remedied, and it is now expected that the going of the clock will be satisfactory.-The rate of the standard meantime clock was altered on May 29, and the arc having steadily diminished for some months, the clock was cleaned on November 12. It was found, however, to be in a satisfactory condition, and the change in the length of the arc was probably due to thickening of the oil in the dry weather. The rates of both clocks have been compared with rates furnished by the formulæ at the head of the tables. The last rate given in Table IV. is the mean of six days only, December 22 to December 28. Table VI. shows the errors of the time-ball in 1896 The probable error was in January 0.13, in February 0.19, in March 0.20, in April 0.25, in May 0.12, in June 0.12, in July 09.09, in August 0.14, in September 0.16, in October 0.16, in November 0.13 and in December 0.17. There was no failure of the time-ball in 1896. On Government holidays it is not hoisted, and on 4 other days it was considered inadvisable to do so; namely, on April 11 during a severe thunderstorm, on August 9 and October 6 owing to strong easterly gales and on July 30 when, in consequence of the typhoon of the previous day, the line was in contact with other lines.
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