The mean probable error of the time ball in each month for the past five years is given in the following table :-
Month. 1920 1921 1922 1923 1924 January, ±0.17 ±0.25 +0.10 ±0.16 +0.26 February, *30 *13 *15 *14 *13 March.. *21 *4 *12 *11 *17 April.. *15 *27 *20 *18 *27 May, *17 *16 *10 *13 *23 June, *13 *17 *11 *21 *27 July, *22 *10 *14 *12 *21 August.. *11 *10 *10 *28 *16 September, *24 *20 *15 *24 *13 October, *15 *10 *10 *15 *18 November, *19 *10 *17 *21 *14 December, *13 *13 *12 *10 *10 Means, ±0.18 +0.18 +0.13 +0.17 ±0.19Probable Error of the Time Ball.
Time Signals by Radio-Telegraphy.-In addition to the time signals given by the Time Ball, and on the radio mast, signals are sent at 10h. and 21h. by radio telegraphy via Stonecutters. Particulars of the programme are given in Government Notifications No. 359 of 13.6.24. and No. 637 of 14.11.24.
Radio Receiving Set.-The radio receiving set was removed to the old telescope house upon the west lawn on April 30 and operated since that date by the Public Works Department. The telephone lines are extended to the clock room so that time signals may be observed as before with the added advantage of expert tuning.
242 comparisons were obtained with the Manila Observatory via Cavite. The mean result makes Manila 0.88 sec. Fast on Hongkong. It should be noted, however, that the comparisons fall into two distinct groups as follows.—
No. of Comparisons. Mean Result. January to April (inclusive) 100 Manila 1.20 fast on H.K. May to December (inclusive) 142 Manila 0.67 fast on H.K.No change has been made in the time service routine at this Observatory. The actual change appears to have occurred on or about April 25th, 5 days before the transfer of the receiving set to fresh quarters.
· F 14
The mean probable error of the time ball in each month for
years is given in the following table :-
the
past
five
Probable Error of the Time Ball.
Month.
1920
1921
1922
!
1923
1924
January,
±0.17
±0.25
+0:10
±0.16
+0.26
February,
*30
*13
15
14
13
March..
*21
+4
*12
'I I
17
April..
15
27
*20
*18
*27
May,
*17
∙16
*10
*13
*23
June,
13
'17
*I I
*21
*27
July,
*22
'10
14
*12
*21
August..
Il
*10
10
*28
16
September,
*24
*20
15
24
13
October,
15
*10
'JO
*15
*18
November,
19
*10
∙17
21
14
*10
December,
*13
*13
12
Means,
±0.18 +0*18 +0.13 +0'17 ±0.19
Time Signals by Radio-Telegraphy.-In addition to the time signals given by the Time Ball, and on the radio mast, signals are sent at 10h. and 21h. by radio telegraphy ria Stonecutters. Particulars of the programine are given in Government Notifica- tions No. 359 of 13.6.24. and No. 637 of 14.11.24.
Radio Receiving Set.-The radio receiving set was removed to the old telescope house upon the west lawn ou April 30 and operated since that date by the Public Works Department. The telephone lines are extended to the clock room so that time signals may be observed as before with the added advantage of expert tuning.
242 comparisons were obtained with the Manila Observatory ria Cavite. The mean result makes Manila 0.88 see. Fast on Hongkong. It should be noted, however, that the comparisons fall into two distinct groups as follows.—
January to April (inclusive) May to December (inclusive)
No. of Com-
parisons.
Mean Result.
Secs.
100
Manila 1.20 fast on H.K.
142
Manila 0.67 fast on H.K.
No change has been made in the time service routine at this Observatory. The actual change appears to have occurred on or about April 25th, 5 days before the transfer of the receiving set to fresh quarters.
No comments yet.
Private notes are available after approval.