F 13
Force, Dip and Declination must be made by one of the European staff at least once a week. The site must not only be free from any local magnetic attraction but must be safeguarded from possible building encroachment in the future.
VIII. TIME SERVICE.
Time Ball.-The Time Ball on Kowloon Signal Hill is dropped at 10 a.m. and 4 p.m., daily, except on Saturdays when it is dropped at 10 a.m. and 1 p.m., and on Sundays and Holidays when it is dropped at 10 a.m. only (120th Meridian Time).
The Ball is hoisted half mast at the 55th minute and full mast at the 57th minute. If the ball fails to drop at the correct time it is lowered at 5 minutes past the hour and the ordinary routine repeated at the following hour, if possible.
The flag system was in use from May 12 to 21, during repairs to the timeball apparatus.
Time Signals are also given at night by means of three white lamps mounted vertically on the Observatory radio mast. Until November 30, the lamps were extinguished momentarily at the even seconds, except at the 2nd, 28th, 50th, 52nd and 54th of each minute, from 8h. 56m. 0s. to 9h. 0m. 0s. p.m. From December 1st, the Manila system was in operation wherein the lights are extinguished every second, from 8h. 55m. to 9h. 0m. p.m., except at the 28th, 29th, 54th, 56th, 57th, 58th and 59th seconds. The 9 p.m. signals were repeated at midnight on December 31st, the last flash indicating the close of the year 1924. The hours refer to Hongkong Standard Time (8 hours East of Greenwich).
The Time Ball was dropped successfully 649 times. There were three failures; on May 22nd, at 4 p.m., June 26th at 4 p.m. and December 18th at 10 a.m., one being caused by electrical defects, the remainder being due to negligence of the computer in charge at the tower. The ball was dropped successfully at the subsequent hour on each occasion. It was not raised on October 4th at 1 p.m. owing to high winds.
In the following table is given the number of times different errors occurred in the years 1923 and 1924.
Error 1923 1924 0'3 sec. or less 604 530 0'4 29 44 0'5 1 2 0'6 7 23 0'7 - ** 0'8 - - 0'9 - -!
F 13
Force, Dip and Declination must be made by one of the European staff at least once a week. The site must not only be free from any local magnetic attraction but must be safeguarded from possible building encroachment in the future.
VIII. TIME SERVICE.
Time Ball.-The Time Ball on Kowloon Signal Hill is dropped at 10 a.m. and 4 p.m., daily, except on Saturdays when it is dropped at 10 a.m. and 1 p.m., and on Sundays and Holidays when it is dropped at 10 a.m. only (120th Meridian Time).
The Ball is hoisted half mast at the 55th minute and full must at the 57th minute. If the ball fails to drop at the correct time it is lowered at 5 minutes past the hour and the ordinary routine repeated at the following hour, if possiblė.
The flag system was in use from May 12 to 21, during re- pairs to the timeball apparatus.
Time Signals are also given at night by means of three white lamps mounted vertically on the Observatory radio mast. Until November 30, the lamps were extinguished momentarily at the even seconds, except at the 2nd. 28th, 50th, 52nd and 54th of each minute, from 8h. 56m. Os. to 94. Om. Os. p.m. From December 1st, the Manila system was in operation wherein the lights are extinguished every second, from 8h. 55m, to 9h. Om. p.m., except. at the 28th, 29th, 54th. 56th, 57th, 58th and 59th seconds. The 9 p.m. signals were repeated at midnight on December 31st, the Jasi flash indicating the close of the year 1924. The hours refer to Hongkong Standard Time (8 hours East of Greenwich).
The Time Ball was dropped successfully 649 times. There were three failures; on May 22nd, at 4 p.m., June 26th at 4 p.m. and December 18th at 10 a.m., one being caused by electrical defects, the remainder being due to negligence of the computer in charge at the tower. The ball was dropped successfully at the subsequent hour on each occasion. It was not raised on October
4th at 1 p.m. owing to high winds.
In the following table is given the number of times different. errors occurred in the years 1923 and 1924.
Number of Times.
Error.
1923
1924
0'3 sec. or less
0'4
604 29
530
44
"
0'5
1 2
37
>>
7
23
??
0'7
+
**
0.8
>>
o'9
ลง
>
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