F 11
After this alteration the value of log2K at 0°C was found to be 3.4461100004 as against 3.41643 determined at Kew in 1915 and used in the 1916 comparisons. The value of P from the 18 observations in 1919-1920 was +7.5807; whereas the value used in 1916, as derived from 7 observations was +7·78 ±0·8.
Elliott 55 and vibration magnet 55 in old hut.
(a) 20′ 6″ W.
Declination.
Elliott 83 and vibration magnet 83 in new hut.
(a)–(b) Number of observations.
(b) 19′ 33″ +30″ 22
Elliott 83 and vibration magnet 83 in old hut.
(a) 20′ 22″ W.
Elliott 55 and vibration magnet 55 in new hut.
(b) 20′ 51″ 32″ 6
Dip.
Dover 71 in old hut.
in new hut.
(a) 30° 46′ 48″ N.
(b) 30° 47′ 75″ N. -1′ 27″ 16
VIII.-TIME SERVICE.
Time Ball.-Prior to 1920, January 1, the Time Ball on Kowloon Signal Hill was dropped daily at 1 p.m. (120th Meridian Time). It is now 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.
The Ball is hoisted half mast at the 5th 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.
When the Time Ball is out of order the above routine is carried out with the flag "Z" on the Storm Signal mast.
Time Signals are also given at night by means of three white lamps mounted vertically on the Observatory wireless mast. 8h. 56m. 0s. to 9h. 0m. 0s. p.m. the lamps are extinguished momentarily at the even seconds, except at the 2nd, 28th, 50th, 52nd, and 54th of each minute. The hours refer to Hongkong Standard Time (8 hours East of Greenwich).
The ball was dropped successfully 351 times. There were 6 failures attributable to electrical and mechanical defects or to the negligence of the computers in charge at the tower. The days on which the ball failed to drop were:-February 19, March 9, April 26, May 16 and September 20 (twice).