Appendix F.
REPORT OF THE DIRECTOR OF THE ROYAL OBSERVATORY, HONGKONG, FOR THE YEAR 1920.
I. GROUNDS AND BUILDINGS.
The grounds were kept in order by the Botanical and Forestry Department with the assistance of the Observatory coolies.
Concreting the paths round the servants' quarters was completed in the month of October.
II. METEOROLOGICAL INSTRUMENTS.
Barometers. - A Marvin compensated syphon barometer was received on July 3. The tube was satisfactorily filled with mercury, but unfortunately it was broken in fitting it to its U tube and support. Two new tubes were ordered in August but have not yet been received.
Beckley Anemograph. - This instrument was oiled once a month, and the orientation of the head checked.
Dines-Baxendell Anemograph. - The head was oiled once a month, and the spindle of the float cleaned and oiled once a week. The orientation of the head was checked monthly.
The mean monthly results of comparisons with the records of the Beckley Anemograph from 1910-1919 are given in the following table, together with the results for 1920:
Month Mean 1910-1919 1920 January 2.10 February 2.15 1.67 March 2.17 1.67 April 2.16 1.77 May 2.19 1.98 June 2.18 2.40 July 2.29 2.09 August 2.29 1.58 September 2.29 1.53 October 2.22 1.43 November 2.14 1.36 December 2.07 1.50 Year 2.19 1.72Factor for converting the actual run of the Beckley Anemograph cups to velocities recorded by the Dines Pressure Tube Anemograph.
Factor (Dines Beckley).