F 15
The results of observations made in 1927 are as follows:-
Station. No. of observations. Deduced Longitude of Hong Kong. Nauen 332 7. 36. 41.20 E Bordeaux 80 7. 36, 41.32 ETransit 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 1927 and 1928 was as follows:-
Year. Transits Level determinations Azimuth determinations (mark) Azimuth determinations (transits of circumpolar stars) Collimation determinations (mark). 1927 1156 566 42 44 1928 1200 620 31 276 41Clocks. Sidereal Clock Cottingham and Mercer, No. 507, has been in use as the Observatory Standard throughout the year. Its performance has been marked by a steady increase of losing rate, with superposed fluctuations corresponding to variations of pressure in the clock case due to temperature changes. No increase of pressure due to leakage in the case has been observed. The losing rate varied from +0s.29 (on February 25) to 0s.89 (on October 9). The clock tripped on three occasions owing to defects in the remontoire batteries.
The Sidereal Clock Dent 39741 stopped on November 17 and November 18. It was cleaned and oiled on November 19, since when it has gone without further interruption. The rate has been altered as found necessary in order to keep its error approximately the same as Cottingham.
The Mean Time Clock, Leroy 1350, was used for dropping the time ball, maintaining the electric time service in the Observatory, and sending hourly signals to the Railway, the Post Office, the Telephone Co., and the Eastern Extension Telegraph Co. The clock is corrected daily before 10h. and 16h. by the electric regulating apparatus. The daily rate of the pendulum is kept below 0.5 sec. by the addition or withdrawal of weights. Mean Time Clock Dent, 39740, has been corrected daily and its rate regulated as in the case of Leroy 1350.
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