F 15
Between September 3 and November 1, 13 comparisons were obtained with Bordeaux, by means of observed coincidences of the Dent Sidereal clock with the rhythmic beats emitted by Bordeaux. The results are in close agreement, and, assuming the correctness of the Bordeaux signal, the E. longitude of Hongkong would appear to be 0·56sec too great. A similar investigation of 26 comparisons with Tokio makes the Hongkong longitude E. 0·59sec too great, although the agreement of the observations leaves much to be desired, no doubt owing to the nature of the Tokio signals (a dash of 1 second duration at the termination of each minute.)
Transit Instrument.-Observations for time were made chronographically by the Chinese computers, and were supplemented by eye and ear observations of the sun's limbs, circumpolar, and other stars made by the Chief Assistant for the purpose of checking the computers' observations, and determining the errors of the instrument.
The number of observations in the years 1923 and 1924 were as follows:-
1923 1924 Transits, 1424 1447 Level determination, 787 864 Azimuth, 52 69 Collimation, 20 66The renovated Troughton and Simms transit instrument was received from England on March 31 and brought into regular use on April 9. There are two eye ends, one arranged for automatic registration, on the chronograph, of each revolution of the micrometer head as a travelling wire crosses the field, and one for ordinary manual signals by a tapper key. The latter has not been in use to date as the former is easily adaptable to observing by either method. Observations made by means of the travelling wire were made until August 18, since when the tapper has been used as formerly; the Chinese staff not acquiring the necessary dexterity in the manipulation of the travelling wire. It is proposed to make a further trial with the travelling wire micrometer when the Chinese staff have had more experience with the instrument.
The 2 non-reversible transit by Dolland, kindly loaned by the Singapore Government was returned early in April.
Clocks. The performance of the Standard Sidereal Clock (Dent 39741) has been characterised by a steady increase in the losing rate since April. It varied from -0·70sec. on April 2 (Bar. 29·54 Temp. 72·8) to +0·31" on December 17 (Bar. 30·10 Temp. 65·0). This approximates to its performance during the last two years.
F 15
Between September 3 and November 1, 13 comparisons were obtained with Bordeaux, by means of observed coincidences of the Dent Sidereal clock with the rhythmic beats emitted by Bordeaux. The results are in close agreement, and, assuming the correctness of the Bordeaux signal, the E. longitude of Hongkong would appear to be 0·56sec too great. A similar investigation of 26 com- parisons with Tokio makes the Hongkong longitude E. 0-59sex too great, although the agreement of the observations leaves much to be desired, no doubt owing to the nature of the Tokio signals (a dash of 1 second duration at the termination of each minute.)
Transit. Instrument.-Observations for time were made chrono- graphically by the Chinese computers, and were supplemented by eye and ear observations of the sun's limbs, circumpolar, and other stars made by the Chief Assistant for the purpose of checking the -computers observations, and determining the errors of the instru-
ment.
The number of observations in the years 1923 and 1924 were as follows:-
Transits,
Level determination, Azimuth,
Collimation,
1923
1924
1424
1447
787
864
52
69
20
66
The renovated Troughton and Simms transit instrument was received from England on March 31 and brought into regular use on April 9. There are two eye ends one arranged for automatic registration, on the chronograph, of each revolution of the micrometer head as a travelling wire crosses the field, and one for ordinary manual signals by a tapper key. The latter has not been in use to date as the former is easily adaptable to observing by either method. Observations made by means of the travelling wire were made until August 18, since when the tapper has been used as formerly; the Chinese staff not acquiring the necessary dexterity in the manipulation of the travelling wire. It is proposed to make a further trial with the travelling wire micrometer when the Chinese staff have had more experience with the instrument.
·
The 2 nou-reversible transit by Dolland, kindly loaned hy the Singapore Government was returned early in April.
Clocks. The performance of the Standard Sidereal Clock (Dent 39741) has been characterised by a steady increase in the losing rate since April. It varied from-0.70sec. on April 2 (Bar. 29-54 Temp. 72-8) to +031" on December 17 (Bar. 30·10 Temp. 65-0). This approximates to its performance during the last two
years.
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