90
4
here free of cost. During the past year 7 barometers, 5 anëroids and 10 thermometers were verified. In addition, several hundred barometers and aneroids on board ship were compared with our standard. 12. 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 1897.
Date.
Jan.
Feb. Mar. April. May.
June.
July. Aug. Sept. Oct. Nov.
Dec.
1,
2,
3,
4,
5,
6,
7,
8,
9,
10,
11,
12,
13,
14,
15,
16,
17,
18,
19,
20,
21,
22,
23,
24,
25,
26,
27,
28,
29,
1101000
30,
2222 INNNN1 01 00 01 01 NNNNNNNN~~~~~~~~~
NAN2 DIN TANDOO-IN
1122~~~~NNNNCO ON OI O 10 -
-HI2N » N
3
3
3
1
2
2
ŊŊKU10 10 09 09 IP C2 Ch 05 09 10 09 09 10 11 10 10 4 0 0 1 10 N NNE
2
2
2
2
2
3
2
2
2
2
3
do da co co kNWNIJ 10 10 10 10 10 10 10 10 10 NNŊŊ 20 19 19 29 30 30 19 19 19
2
2
19 20 19 10NNON PONDO 10 10 OS OS OS HI HA 00 00 1 00 CRONOLO co co do wier
2
NNNNI Að vel ca cn cs et on N N N 2 N N N DIN NINA - N N DI CO DI GIOI
NANA GAN NAT AN GIANG AS A B B GIAN GIAO N
1
2
2
1
2
2
1
1
1
I
2
I
2
3
31,
Mean,......
1.7
1.9
2.1
1.9
2.6
2.8
2.3
2.7
2.1
2.2
1.5
1.5
13. Mr. PLUMMER observed 402 transits for time determination in 1897, and the axis of the tran- sit instrument was levelled 171 times, i.., upon each day when observations were made.
The rates of the standard clocks are given in the accompanying tables (III and IV), and are compared with the rates given by the formula at the head of the tables. No alteration has been made to either clock during the year, and although it was found necessary to clean the contact springs of the sidereal standard clock on November 29th, this was effected without in any way interfering with the going of the clock.
The errors of the Time Ball are given in table V. The time ball has twice been under repair, namely, from March 5 to 10, when the base of the piston was found to have been shattered, and a new brass base was fixed to it by the Hongkong and Whampoa Dock Company in place of the original cast iron one; and again from July 13 to 19, when the zinc tube within the ball was found to be crumpled up and pressing against the mast. On July
On July 7 the lock was under repair. There were five failures of the time ball in 1897, viz., on March 11 owing to an error of the workmen in centering the new brass base of the piston; on June 25, in consequence of the discharging spring being too weak; on July 6 because the tooth of the lock (being much worn) allowed the piston to jamb against the opposite side of the cylinder; on July 8, because the Assistant failed to raise the piston high enough to free the tooth of the lock; and on July 12, for the reason already given as rendering the repairs necessary on the days immediately following. The ball is not dropped on Government holidays and on one other occasion (Sunday, May 9) in consequence of the illness of two Assistants it was inter- mitted. It was successfully dropped 332 times in this year. The probable error was in January +033, in February 1019, in March +016, in April +012, in May +0:16, in June +013, in July ±0:09, in August 1013, in September ±010, in October ±0.14, in November 2016, in December ±0.12.
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