The following table gives particulars of the time-signals received by radio telegraphy during the year:—
Station Time of Emission No of Observations Pearl Harbour 8 a.m. 104 Pearl Harbour 10.30 a.m. 21 * Nauen 8 a.m. 295 † Nauen 8 a.m. 275 Malabar 9 a.m. 45 Manila 11 a.m. 103 * Bordeaux 4 p.m. 153 † Bordeaux 4 p.m. 127*International Code
†Rhythmic Signals
International Longitude Commission Signals.
The regular observation of the Nauen time signal at 8h. a.m. continues to be an invaluable check on clock performance. The signal consistently maintains a high degree of accuracy; its regular reception, and the performance of the Cottingham clock, have eliminated all but small discrepancies in the computed clock errors over cloudy periods.
Transit Instrument.-Routine transit and level observations were made by the Chinese computers throughout the year. The Collimation and Azimuth determinations and occasional transit observations were made by the Chief and First Assistants.
The number of observations in the years 1925 and 1926 was as follows:-
1925 1926 Transits 1375 1325 Level determinations 702 689 Azimuth determinations 54 119 Collimation determinations 54 102To obviate any possible level effect of a lamp at one end of the transit axis, the wiring for the electric illumination of the transit instrument was altered on April 22, to enable both east and west lamps to be lighted simultaneously. Formerly a two-way switch lighted each lamp separately.
Clocks. Sidereal clock Cottingham and Mercer, No. 507, has been in use as the Observatory Standard throughout the year.
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The following table gives particulars of the time-signals received by radio telegraphy during the year:—
Station.
Time of Emission.
No of Observations.
h
Pearl Harbour
S a.m.
104
Pearl Harbour
10.30 a.m.
21
* Nauen
8 a.m.
295
† Nauen
S a.m.
275
Malabar
9 a.m.
45
Manila
11 a.m.
103
* Bordeaux
4 p.m.
153
† Bordeaux
+ p.m.
127
*International Code
Rhythmic Signals
International Longitude Commission Signals.
The regular observation of the Nauen time signal at 8h. a.m. continues to be an invaluable check on clock performance. The signal consistently maintains a high degree of accuracy; its regular reception, and the performance of the Cottingham clock, have eliminated all but small discrepancies in the computed clock errors over cloudy periods.
Transit Instrument.-Routine transit and level observations were made by the Chinese computers throughout the year. The Collimation and Azimuth determinations and occasional transit observations were made by the Chief and First Assistants.
The number of observations in the years 1925 and 1926 was as follows:-
Transits
Level determinations
Azimuth determinations
Collimation determinations
1925.
1926.
1375
1325
702
689
54
119
54
102
To obviate any possible level effect of a lamp at one end of the transit axis, the wiring for the electric illumination of the transit instrument was altered on April 22, to enable both east and west lamps to be lighted simultaneously. Formerly a two- way switch lighted each lamp separately.
Clocks. Sidereal clock Cottingham and Mercer, No. 507, has been in use as the Observatory Standard throughout the year.
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