AnnualReport-1925 — Page 190

Administrative Reports 行政報告書 All AI Reviewed
Series Prev Next Source

F 12

The Time Ball was dropped successfully 664 times. There was one failure, on December 16th at 10 a.m., owing to an injury sustained by the coolie, when hoisting the ball. It was dropped successfully at 11 h. The ball was not raised on June 26th at 10 h a.m, owing to high wind, and on July 14th at 4 p.m., during a severe thunderstorm.

In the following table is given the number of times different errors occurred in the year 1924 and 1925.

Number of Times. Error of Time Ball. 1924 1925 03 sec. or less 530 631 0'4 " 44 12 0'5 37 8 0-6 "> 23 5 0'7 10 3 "J 0.8 5 0'9 27

Errors of 1.2, 1.9 and 2.0 seconds respectively occurred on one occasion. All errors in excess of 0.7 second occurred during the period January 16 to 22 when the rates of the sidereal clocks were seriously disturbed by workmen. No error greater than 0.4 has occurred since March 27th.

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

Month. 1921 1922 1923 1924 1925 January, +0.25 ±0.10 ±0.16 ±0.26 ±0.38 February, *22 March... *12 *22 April. '20 *18 *16 May, *16 *10 'I I June, *17 *I I *10 July, *IO *Iz *2 I August, *10 *10 *28 *16 September, *20 *15 '10 October, '10 *18 November, *IO December, 'I I *10 '21 •14 Means, +0.18 ±0.13 ±0.17 ±0.19 ±0.15

Edit History

2026-05-07 09:07:57 · NVIDIA / meta/llama-4-maverick-17b-128e-instruct
Live
View comparison
AI Proofread
F 12 The Time Ball was dropped successfully 664 times. There was one failure, on December 16th at 10 a.m., owing to an injury sustained by the coolie, when hoisting the ball. It was dropped successfully at 11 h. The ball was not raised on June 26th at 10 h a.m, owing to high wind, and on July 14th at 4 p.m., during a severe thunderstorm. In the following table is given the number of times different errors occurred in the year 1924 and 1925. Number of Times. Error of Time Ball. 1924 1925 03 sec. or less 530 631 0'4 " 44 12 0'5 37 8 0-6 "> 23 5 0'7 10 3 "J 0.8 5 0'9 27 Errors of 1.2, 1.9 and 2.0 seconds respectively occurred on one occasion. All errors in excess of 0.7 second occurred during the period January 16 to 22 when the rates of the sidereal clocks were seriously disturbed by workmen. No error greater than 0.4 has occurred since March 27th. The mean probable error of the time ball in each month for the past five years is given in the following table: Month. 1921 1922 1923 1924 1925 January, +0.25 ±0.10 ±0.16 ±0.26 ±0.38 February, *22 March... *12 *22 April. '20 *18 *16 May, *16 *10 'I I June, *17 *I I *10 July, *IO *Iz *2 I August, *10 *10 *28 *16 September, *20 *15 '10 October, '10 *18 November, *IO December, 'I I *10 '21 •14 Means, +0.18 ±0.13 ±0.17 ±0.19 ±0.15
Baseline (Original)
F 12 The Time Ball was dropped successfully 664 times. There was one failure, on December 16th at 10 a.m., owing to an injury sustained by the coolie, when hoisting the ball. It was dropped successfully at 11 h. The ball was not raised on June 26th at 10 h a.m, owing to high wind, and on July 14th at 4 p.m., during a severe thunderstorm. In the following table is given the number of times different errors occurred in the year 1924 and 1925. Number of Times. Error of Time Ball. 1924 1925 03 sec. or less 530 631 0'4 " 44 12 0'5 37 8 0-6 >> 23 5 0'7 10 3 "J 0.8 5 0'9 27 Errors of 1.2, 1.9 and 2.0 seconds respectively occurred on one occasion. All errors in excess of 0.7 second occurred during the period January 16 to 22 when the rates of the sidereal clocks were seriously disturbed by workmen. No error greater than 0.4 has occurred since March 27th. 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. 1921 1922 1923 1924 1925 January, +0.25 ±0.10 ±0.16 ±0.26 ±0.38 February, 13 15 14 13 *22 March... 44 *12 'I I 17 *22 April. 27 '20 *18 27 *16 May, *16 *10 13 23 'I I June, *17 *I I 21 27 *10 July, *IO 14 *Iz *2 I 10 August, *10 *10 *28 *16 12 September, *20 *15 24 13 '10 October, 10 '10 15 *18 12 November, *IO December, 'I I 17 *10 '21 •14 '10 13 12 10 Means, +0.18 ±0.13 ±0.17 ±0.19 ±0.15
2026-05-07 09:07:57 · Baseline
View content

F 12

The Time Ball was dropped successfully 664 times. There was one failure, on December 16th at 10 a.m., owing to an injury sustained by the coolie, when hoisting the ball. It was dropped successfully at 11 h. The ball was not raised on June 26th at 10 h a.m, owing to high wind, and on July 14th at 4 p.m., during a severe thunderstorm.

In the following table is given the number of times different errors occurred in the year 1924 and 1925.

Number of Times.

Error of Time Ball.

1924

1925

03 sec. or less

530

631

0'4

"

44

12

0'5

37

8

0-6

>>

23

5

0'7

10

3

"J

0.8

5

0'9 27

Errors of 1.2, 1.9 and 2.0 seconds respectively occurred on one occasion. All errors in excess of 0.7 second occurred during the period January 16 to 22 when the rates of the sidereal clocks were seriously disturbed by workmen. No error greater than 0.4 has occurred since March 27th.

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.

1921

1922

1923

1924

1925

January,

+0.25

±0.10

±0.16

±0.26

±0.38

February,

13

15

14

13

*22

March...

44

*12

'I I

17

*22

April.

27

'20

*18

27

*16

May,

*16

*10

13

23

'I I

June,

*17

*I I

21

27

*10

July,

*IO

14

*Iz

*2 I

10

August,

*10

*10

*28

*16

12

September,

*20

*15

24

13

'10

October,

10

'10

15

*18

12

November,

*IO

December,

'I I

17

*10

'21

•14

'10

13

12

10

Means,

+0.18

±0.13

±0.17

±0.19 ±0.15

Comments

Approved members can add comments, bookmarks, and private notes.

No comments yet.

Private Research Note

Private notes are available after approval.