3
499
10. The following table shows the spectroscopic rainband as observed daily at about 10 a. The mean value for the year was 2.1:-
Table II.
Rainband in 1895.
Date.
Jan.
Feb.
Mar.
April. May. June. July.
Aug.
Sept. Oct.
Nov.
Dec.
3,..........
N N N 1
2
1
2
2
2+
3-
3.
2+
2
2
2+
2 2 ∞
ay
2+.
2+
3
M
3
2+
2+
2+
2+
3-
1
4
3
-
2+
2+
2+
5-
2+
~ ~ ~ N
1
2+
2+
2
N
-
3
2
-
2 2
2-
2-
1
4,.
5,.....
1
3-
2
6,............
1+
1+
N
1
2+
2
7,....
1+
8,.
1
♡ N
2+
2+
2
2-
3.
2
I
1
3
2
3
2+
21 21 20 NN
3+
2
2+
2-
3+
3
3-
4-
∞
A 21
+
2 2
2
-
2+
►
-
✪
-
2
2-
2
2+
2
2+
2+
లు
-
1+
1
2+
2+
3-
ล
1
3
9,.
10,.
2-
2
2
3
2
2+
3
11,.
1+
12,
N
13,
14,........
15,
~ ~
2-
2
2
2
2+
3-
4-
2
2
2
2+
3
2+
2+
2
2+
2-
16,..........
20
~ 2 2
3-
HA
4
2
3
AN
N
2
2
3-
3
2
2+
3
00 00
40. I
3+
~
1 +
2
3-
2 2 1
2
04
2
1
1+
1
3
3-
2 N
2
1+
0+
-
ka
2+
2
1-
2+
2+
3
3
2
1
C
1+
2
2
3-
3
2+
2
3-
2
2+
2+
3-
3
2+ 2
18,..........
1+
2+
2
2
co
2+
2+
~
2
NNN
1
1
0
19,.........
3
*
20,..
2
21,..
1+
22,....
1+
ON
ลง A ล
2
2+
2+
3-
3
3+
2
1
1
N N
2
3
3-
2+
3
3
2
1-
1
2
3.
2+
WAS
3
3-
2
I
1
2+
2+
2+
3
3
2+
0+
1
23,..
1
2
2+
4
2+
to
3
24,........
1+
2
2
3+
W
3-
-
2+
3-
3
~ ~
2+
1
1
25,.
1+
1
2
3+
2+
2+
26,.
1
1+
2+
2
2+
3-
+1
3-
2+
2
3
3
27,...**
1
28,-
1
2 N
2-
2+
2
2+
3-
1
3
3+
3-
3
29,.
31,........
1+
1+
2
N N
2
2+
3-
4
3
2+
2+
3+
4
2
2+
∞ 2 2 N N N
1
1-
2
1
2-
2+
I+
+
2
2+
2+
2
2
2
3.
3
3
2
1+
2
10 N N N
2-
2
-
2
1
1
2-
2+
3-
3-
3
3-
1+
:
Mean,
1.48 2.04 2.06 2.20 2.29 2.37 3.10 2.81 2.20
1.90
1.30
1.39
11. Mr. PLUMMER observed 514 transits in 1895, and levelled the axis of the transit instrument 181 times. The rates of the standard clocks are exhibited in the following tables. They are com- pared with the rates calculated from formulæ exhibited at the head of the tables. The rate and arc of the standard mean time clock last spring indicated that it was again rusty, and it was cleaned in the beginning of May. Table V. shows the errors of the time-ball in 1895. The probable error was in January 009, in February 0 19, in March ( 21, in April 0 12, in May 02 13, in June 012, in July 009, in August 0:11, in September 0; 13, in October 0 13, in November 0 12, and in December 03 11. The errors depend apparently upon the mean amount of clouds, but really upon the periods of cloudy weather when no transits can be obtained. The time-ball is not hoisted on Government holidays. It was not hoisted on the 5th February, as the reversing galvanometer was under repair, on the 29th May, as the lock was under repair, a broken spring being replaced, on the '19th of June, when Mr. Ho To-SHANG, Second Assistant, forgot the key of the tower, on the 28th July owing to a strong gale, on the 14th September, when the line was interrupted, the Public Works Department making alterations, and on the 2nd and 24th November when there was no discharge current, the fault lying with the battery. On 7 days the ball was therefore not hoisted. It was hoisted but failed to drop 5 times. On the 3rd and 28th May the failure was due to the reversing galvanometer being out of adjustment. On the 31st May the piston failed to rest on the tooth of the lock. On the 1st of June the hammer spring was not pulled tight enough. On the 1st of September the cause of failure is not known.
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