F 14
The probable error of the time ball in each month of the past five years is given in the following table. During the period that the time ball was out of action the figures apply to the 10 a.m. radio signals.
Probable Error of the Time Ball.
Month. 1924 1925 1926 1927 1928 January, ±0.26 +0.38 ±0.13 ±0.14 ±0.13 February, 18 12 10 13 March, *17 *22 ! I '10 April.... *27 16 13 '10 -10 May, 23 *10 14 *10 June, *27 '10 *10 13 20 July, 10 '10 '10 'I I August. ·16 *12 *10 12 20 September, 13 '10 *10 *10 October, •18 *12 November, 14 '10 10 10 10 December, 12 *10 *13 *13 *12 Means, ±0.19 ±0.15 ±0.12 +0.12 ±0.12Time Signals by Radio-Telegraphy.—In addition to the time signals given by the time ball, and on the radio mast, signals are broadcast at 10h. and 21h. by radio-telegraphy, via Cape D'Aguilar. Particulars of the programme are given in Government Notification No. 322 of 1.6.28.
On December 27 it was found that the programme wheel of the time-signal clock was one second in advance of the second hand. In consequence the radio time signals and the lamp signals have been one second early, probably since May 10, when adjustments were made. This error was eliminated on December 27.
311 observations of the rhythmic radio time signals emitted by Nauen at 8h. a.m., Hong Kong Standard Time, have been made during the year and 80 observations of a similar signal emitted by Bordeaux at 4 p.m. Hong Kong Standard Time.
The observations have been utilized for clock regulation during cloudy weather and have been tabulated for longitude determination. This cannot be completed until the errors of the time signals are received.