AnnualReport-1921 — Page 182

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F 11

The days on which the ball failed to drop were:- April 14, (10h.), April 15, (16h.), April 16, (10h. and 11h.) and November 25, (10h.).

In the following table is given the number of times different errors occurred in the years 1920 and 1921:

Error. Number of Times, 1920 Number of Times, 1921 0'3 sec. or less 562 573 0'4 ** 61 0'5 34 21 0'6 15 21 1'0 1 2 0'9 1 0 1'1 ** ** 1 27 I J I J J1 173 " I 15 55 1.6 16 17 1.8 J 2.0 " 6 " ++~ + N N N N N - I

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, 1917 1918 1919 1920 1921 Month. January, +0s.17 ±0s.24 +0s.17 ±0s.25 February, *10 13 *20 *30 13 March.. *11 15 '12 '21 ++ April. 18 *10 19 May, 15 '27 June, 17 '12 14 17 16 July, 10 14 13 17 21 August.. *11 13 '22 *10 September, '11 •26 15 11 10 October, 'IC 16 *24 *20 November, 10 '12 15 15 *10 December, '10 + '12 13 '11 Means,.. ±0s.13 ±0s.14 ±0s.15 +0s.18 +0s.18

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2026-05-06 23:39:51 · NVIDIA / meta/llama-4-maverick-17b-128e-instruct
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F 11 The days on which the ball failed to drop were:- April 14, (10h.), April 15, (16h.), April 16, (10h. and 11h.) and November 25, (10h.). In the following table is given the number of times different errors occurred in the years 1920 and 1921: Error. Number of Times, 1920 Number of Times, 1921 0'3 sec. or less 562 573 0'4 ** 61 0'5 34 21 0'6 15 21 1'0 1 2 0'9 1 0 1'1 ** ** 1 27 I J I J J1 173 " I 15 55 1.6 16 17 1.8 J 2.0 " 6 " ++~ + N N N N N - I 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, 1917 1918 1919 1920 1921 Month. January, +0s.17 ±0s.24 +0s.17 ±0s.25 February, *10 13 *20 *30 13 March.. *11 15 '12 '21 ++ April. 18 *10 19 May, 15 '27 June, 17 '12 14 17 16 July, 10 14 13 17 21 August.. *11 13 '22 *10 September, '11 •26 15 11 10 October, 'IC 16 *24 *20 November, 10 '12 15 15 *10 December, '10 + '12 13 '11 Means,.. ±0s.13 ±0s.14 ±0s.15 +0s.18 +0s.18
Baseline (Original)
F 11 The days on which the ball failed to drop were:-April 14, (10h.), April 15, (16h.), April 16, (10%. and 11.) and November 25, (10%). In the following table is given the number of times different errors occurred in the years 1920 and 1921 :--- Error. Number of Times, 1920 1921 03 sec. or less 562 573 04 ** 61 34 21 15 21 TO I I 1 2 0'9 1'0 1'] ** ** I 27 I J J1 173 " I 15 55 16 17 1.8 J. 2.0 " 6 འ ++~ + N N N N N - I 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, Mouth. 1917 1918 1919 1920 1921 January, +0*17 ±0.24 +0.17 ±0.25 February, *10 13 *20 *30 13 March.. *I I 15 'I 2 '2 1 ++ 18 *10 19 April. 15 '27 May, 17 'I 2 14 17 16 10 June, 14 14 13 17 2 1 *I I 13 '22 *10 July, 'I I •26 15 1 1 10 Angust.. September, *IC 16 *24 *20 October, 10 'I 2 15 15 *TO November, '10 I 2 19 *10 December, 'TO + 'IZ 13 "I I Means,.. ±0.13 ±0.14 ±0.15 +0.18 +0:18
2026-05-06 23:39:51 · Baseline
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F 11

The days on which the ball failed to drop were:-April 14, (10h.), April 15, (16h.), April 16, (10%. and 11.) and November 25, (10%).

In the following table is given the number of times different errors occurred in the years 1920 and 1921 :---

Error.

Number of Times,

1920

1921

03 sec. or less

562

573

04

**

61

34

21

15

21

TO

I I

1 2

0'9

1'0

1']

**

**

I

27

I

J

J1

173

"

I

15

55

16

17

1.8

J.

2.0

"

6

འ

++~ + N N N N N -

I

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,

Mouth.

1917

1918

1919

1920

1921

January,

+0*17

±0.24

+0.17

±0.25

February,

*10

13

*20

*30

13

March..

*I I

15

'I 2

'2 1

++

18

*10

19

April.

15

'27

May,

17

'I 2

14

17

16

10

June,

14

14

13

17

2 1

*I I

13

'22

*10

July,

'I I

•26

15

1 1

10

Angust..

September,

*IC

16

*24

*20

October,

10

'I 2

15

15

*TO

November,

'10

I 2

19

*10

December,

'TO

+

'IZ

13

"I I

Means,..

±0.13

±0.14

±0.15

+0.18

+0:18

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