AnnualReport-1915 — Page 160

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-- F10

VI.-MAGNETIC OBSERVATIONS.

Absolute determinations of magnetic horizontal force, dip, and declination were made near the middle of each month with instruments of the Kew pattern. In the determinations of horizontal force two sets of deflection observations were made, one before and one after the vibration observations. Four dip needles were used in rotation, two on one day of each month.

The alterations to the Kew Magnetometer No. 83, which was sent to England in February 1914, were completed early in the year. The instrument was then compared with the Kew Standard by the Kew observer in February and by the Director of the Hongkong Observatory in June and July, when on leave of absence.

The results of the comparisons are given below :-

Date. Kew -83. February, + 28y + 28 June 24d 11h + 29 24 12 + 32 24 15 + 72 July 1 11 + 28 1 12 + 31 1 15 + 33

Rejecting the result at 15" on June 24, which appears to be wrong, we have +31y as the correction obtained by Mr. Claxton, and +28y by the Kew Observer. The mean of the 7 accepted values is 30y, which may be considered as the correction to apply to reduce to the Kew Standard in 1915.

The mean values of the Magnetic elements for the years 1914 and 1915 were as follows:-

1915. 1914. Declination (west). 0° 11' 40" 0° 8′ 31′′ Dip (north), 30 52 10 30 53 28 Horizontal Force (C.G.S. unit), 0.37167 0.37192 Vertical Force (C.G.S. unit), 0.22217 0.22351 Total Force (C.G.S. unit), .. 0'43293 0.43340

In the month of February Mr. F. Brown, of the Carnegie Institute, Magnetic Section, in co-operation with Messrs. Claxton, Jeffries, and Evans, made a series of comparisons between the magnetic instruments of this Observatory and a set of C. I. instruments, before setting out on a magnetic survey of North China. The results of the comparisons have not yet been received.

VII. TIME SERVICE.

Time Ball-The Time Ball on Blackhead's Hill is dropped daily at 13" Hongkong Standard Time (5" a.m. of Greenwich Time). The ball is also dropped at any other hour in case of necessity. One application for a supplementary time signal was made in the year 1915 on February 8. The ball was dropped successfully 365 times. There were no failures.

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-- F10 VI.-MAGNETIC OBSERVATIONS. Absolute determinations of magnetic horizontal force, dip, and declination were made near the middle of each month with instruments of the Kew pattern. In the determinations of horizontal force two sets of deflection observations were made, one before and one after the vibration observations. Four dip needles were used in rotation, two on one day of each month. The alterations to the Kew Magnetometer No. 83, which was sent to England in February 1914, were completed early in the year. The instrument was then compared with the Kew Standard by the Kew observer in February and by the Director of the Hongkong Observatory in June and July, when on leave of absence. The results of the comparisons are given below :- Date. Kew -83. February, + 28y + 28 June 24d 11h + 29 24 12 + 32 24 15 + 72 July 1 11 + 28 1 12 + 31 1 15 + 33 Rejecting the result at 15" on June 24, which appears to be wrong, we have +31y as the correction obtained by Mr. Claxton, and +28y by the Kew Observer. The mean of the 7 accepted values is 30y, which may be considered as the correction to apply to reduce to the Kew Standard in 1915. The mean values of the Magnetic elements for the years 1914 and 1915 were as follows:- 1915. 1914. Declination (west). 0° 11' 40" 0° 8′ 31′′ Dip (north), 30 52 10 30 53 28 Horizontal Force (C.G.S. unit), 0.37167 0.37192 Vertical Force (C.G.S. unit), 0.22217 0.22351 Total Force (C.G.S. unit), .. 0'43293 0.43340 In the month of February Mr. F. Brown, of the Carnegie Institute, Magnetic Section, in co-operation with Messrs. Claxton, Jeffries, and Evans, made a series of comparisons between the magnetic instruments of this Observatory and a set of C. I. instruments, before setting out on a magnetic survey of North China. The results of the comparisons have not yet been received. VII. TIME SERVICE. Time Ball-The Time Ball on Blackhead's Hill is dropped daily at 13" Hongkong Standard Time (5" a.m. of Greenwich Time). The ball is also dropped at any other hour in case of necessity. One application for a supplementary time signal was made in the year 1915 on February 8. The ball was dropped successfully 365 times. There were no failures.
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-- F10 VI.-MAGNETIC OBSERVATIONS. Absolute determinations of magnetic horizontal force, dip, and declination were made near the middle of each month with instru- ments of the Kew pattern. In the determinations of horizontal force two sets of deflection observations were made, one before and one after the vibration observations. Four dip needles were used in rotation, two on one day of each month. The alterations to the Kew Magnetometer No. 83, which was sent to England in February 1914, were completed early in the year. The instrument was then compared with the Kew Standard by the Kew observer in February and by the Director of the Hongkong Observatory in June and July, when on leave of absence. The results of the comparisons are given below :- Date. February, " June 24d 11h 24 12 24 15 July 1 11 י 1 12 1 15 Kew -83. + 28y + 28 + 29 + 32 + 72 + 28 + 31 + 33 Rejecting the result at 15" on June 24, which appears to be wrong, we have +31y as the correction obtained by Mr. Claxton, and +28y by the Kew Observer. The mean of the 7 accepted values is 30y, which may be considered as the correction to apply to reduce to the Kew Standard in 1915. The mean values of the Magnetic elements for the years 1914 and 1915 were as follows:- Declination (west). 1915. 1914. 0° 8′ 31′′ Dip (north), .30 53 28 0° 11' 40" 30 52 10 Horizontal Force (C.G.S. unit), Vertical Force (C.G.S. unit), Total Force (C.G.S. unit), .. 0.37192 0.37167 0.22351 0.22217 0-43340 0'43293 In the month of February Mr. F. Brown, of the Carnegie Institute, Magnetic Section, in co-operation with Messrs. Claxton, Jeffries, and Evans. made a series of comparisons between the magnetic instruments of this Observatory and a set of C. I. instru- ments, before setting out on a magnetic survey of North China. The results of the comparisons have not yet been received. VII. TIME SERVICE. Time Ball-The Time Ball on Blackhead's Hill is dropped daily at 13" Hongkong Standard Time (5" a.m. of Greenwich Time). The ball is also dropped at any other hour in case of necessity. One application for a supplementary time signal was made in the year 1915 on February 8. The ball was dropped successfully 365 times. - There were no failures.
2026-05-06 10:02:59 · Baseline
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-- F10

VI.-MAGNETIC OBSERVATIONS.

Absolute determinations of magnetic horizontal force, dip, and declination were made near the middle of each month with instru- ments of the Kew pattern. In the determinations of horizontal force two sets of deflection observations were made, one before and one after the vibration observations. Four dip needles were used in rotation, two on one day of each month.

The alterations to the Kew Magnetometer No. 83, which was sent to England in February 1914, were completed early in the year. The instrument was then compared with the Kew Standard by the Kew observer in February and by the Director of the Hongkong Observatory in June and July, when on leave of absence.

The results of the comparisons are given below :-

Date. February,

"

June 24d 11h

24 12

24 15

July 1 11

י

1 12

1 15

Kew -83.

+ 28y

+ 28

+ 29

+ 32

+ 72

+ 28

+ 31

+ 33

Rejecting the result at 15" on June 24, which appears to be wrong, we have +31y as the correction obtained by Mr. Claxton, and +28y by the Kew Observer. The mean of the 7 accepted values is 30y, which may be considered as the correction to apply to reduce to the Kew Standard in 1915.

The mean values of the Magnetic elements for the years 1914 and 1915 were as follows:-

Declination (west).

1915.

1914. 0° 8′ 31′′

Dip (north),

.30 53 28

0° 11' 40" 30 52 10

Horizontal Force (C.G.S. unit), Vertical Force (C.G.S. unit), Total Force (C.G.S. unit), ..

0.37192

0.37167

0.22351

0.22217

0-43340

0'43293

In the month of February Mr. F. Brown, of the Carnegie Institute, Magnetic Section, in co-operation with Messrs. Claxton, Jeffries, and Evans. made a series of comparisons between the magnetic instruments of this Observatory and a set of C. I. instru- ments, before setting out on a magnetic survey of North China. The results of the comparisons have not yet been received.

VII. TIME SERVICE.

Time Ball-The Time Ball on Blackhead's Hill is dropped daily at 13" Hongkong Standard Time (5" a.m. of Greenwich Time). The ball is also dropped at any other hour in case of necessity. One application for a supplementary time signal was made in the year 1915 on February 8. The ball was dropped successfully 365 times. - There were no failures.

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