AnnualReport-1923 — Page 187

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F 13

The Time Ball was dropped successfully 658 times. There was one failure; on November 23, when the handle of the winding gear was broken and it was impossible to raise the ball to the top of the mast by 10h. The handle was repaired by the Railway Department and replaced in time for the ball to be dropped at 16h. The ball was also dropped accidentally on November 20 at 15h. 574m., but was raised and dropped correctly at 16h. On 9 occasions the ball was not raised owing to typhoon gales.

In the following table is given the number of times different errors occurred in the years 1922 and 1923.—

Error 1922 1923 0'3 sec. or less 633 0'4 > 0*5 "" 0.6 IO 6 604 29 1 2 7 4 0.8 77 I 2 0'9

The mean probable error of the time ball in each month for the past five years is given in the following table :-

Month 1919 1920 1921 1922 1923 January ±0*24 '20 February +0*17 *30 ±0.25 13 +0.10 15 ±0.16 14 March *12 *21 44 12 'I I April *19 *15 *27 *20 *18 May 14 *17 *16 '10 *13 June 14 13 17 *I I *21 July 13 *22 "10 14 *12 August *15 'I I '10 ΙΟ *28 *10 24 September *20 IS Zit October *15 *15 *10 *10 15 November 14 19 'IO 17 '21 *12 13 'I I 'IO 13 December Means ±0.15 +0.18 +0.18 ±0.13 +0'17

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F 13 The Time Ball was dropped successfully 658 times. There was one failure; on November 23, when the handle of the winding gear was broken and it was impossible to raise the ball to the top of the mast by 10h. The handle was repaired by the Railway Department and replaced in time for the ball to be dropped at 16h. The ball was also dropped accidentally on November 20 at 15h. 574m., but was raised and dropped correctly at 16h. On 9 occasions the ball was not raised owing to typhoon gales. In the following table is given the number of times different errors occurred in the years 1922 and 1923.— Error 1922 1923 0'3 sec. or less 633 0'4 > 0*5 "" 0.6 IO 6 604 29 1 2 7 4 0.8 77 I 2 0'9 The mean probable error of the time ball in each month for the past five years is given in the following table :- Month 1919 1920 1921 1922 1923 January ±0*24 '20 February +0*17 *30 ±0.25 13 +0.10 15 ±0.16 14 March *12 *21 44 12 'I I April *19 *15 *27 *20 *18 May 14 *17 *16 '10 *13 June 14 13 17 *I I *21 July 13 *22 "10 14 *12 August *15 'I I '10 ΙΟ *28 *10 24 September *20 IS Zit October *15 *15 *10 *10 15 November 14 19 'IO 17 '21 *12 13 'I I 'IO 13 December Means ±0.15 +0.18 +0.18 ±0.13 +0'17
Baseline (Original)
F 13 The Time Ball was dropped successfully 658 times. There was one failure; on November 23, when the handle of the winding gear was broken and it was impossible to raise the ball to the top of the mast by 10h. The handle was repaired by the Railway Department and replaced in time for the ball to be dropped at 16h. The ball was also dropped accidently on November 20 at 15h. 574m., but was raised and dropped correctly at 16h. On 9 occa- sions the ball was not raised owing to typhoon gales. In the following table is given the number of times different errors occurred in the years 1922 and 1923.— Number of Times. Error. 1922 1923 0'3 sec. or less 633 0'4 >> 0*5 "" 0.6 IO 6 604 29 1 2 7 4 0.8 77 I 2 0'9 The mean probable error of the time ball in each month for the past five years is given in the following table :- Probable Error of the Time Ball. Month. 1919 1920 1921 1922 1923 January, ±0*24 '20 February, +0*17 *30 ±0.25 13 +0.10 15 ±0.16 14 March..... *12 *21 44 12 'I I April. *19 *15 *27 *20 *18 · May, 14 *17 *16 '10 *13 June, 14 13 17 *I I *21 July, 13 *22 "10 14 *12 August, *15 'I I '10 ΙΟ *28 *10 24 *20 IS Zit September, October, *15 *15 *10 *10 15 November, 14 19 'IO 17 '21 *12 13 'I I 'IO 13 December, Means,. ±0.15 +0.18 +0.18 ±0.13 +0'17
2026-05-07 04:14:57 · Baseline
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F 13

The Time Ball was dropped successfully 658 times. There was one failure; on November 23, when the handle of the winding gear was broken and it was impossible to raise the ball to the top of the mast by 10h. The handle was repaired by the Railway Department and replaced in time for the ball to be dropped at 16h. The ball was also dropped accidently on November 20 at 15h. 574m., but was raised and dropped correctly at 16h. On 9 occa- sions the ball was not raised owing to typhoon gales.

In the following table is given the number of times different errors occurred in the years 1922 and 1923.—

Number of Times.

Error.

1922

1923

0'3 sec. or less

633

0'4

>>

0*5

""

0.6

IO

6

604

29

1 2

7

4

0.8

77

I

2

0'9

The mean probable error of the time ball in each month for the past five years is given in the following table :-

Probable Error of the Time Ball.

Month.

1919

1920

1921

1922

1923

January,

±0*24

'20

February,

+0*17 *30

±0.25

13

+0.10 15

±0.16

14

March.....

*12

*21

44

12

'I I

April.

*19

*15

*27

*20

*18

·

May,

14

*17

*16

'10

*13

June,

14

13

17

*I I

*21

July,

13

*22

"10

14

*12

August,

*15

'I I

'10

ΙΟ

*28

*10

24

*20

IS

Zit

September,

October,

*15

*15

*10

*10

15

November,

14

19

'IO

17

'21

*12

13

'I I

'IO

13

December,

Means,.

±0.15 +0.18

+0.18

±0.13

+0'17

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