F 6
VI.-MAGNETIC OBSERVATIONS.
12. The Magnetic Station at Au Tau has been kept in action throughout the year, and the results of the observations are being prepared for press.
VII. TIME SERVICE.
13. Clocks Cottingham and Mercer 507 (Sidereal) and Leroy 1350 were in use throughout the year. The necessary astronomical observations for the determination of the error of the former were obtained each evening (weather permitting) by the local staff. Observations of the radio time signals emitted by Nauen have been made daily whenever possible during the year and utilised for Clock regulation.
14. Time Signals were given throughout the year by radio from 9.55 a.m. to 10 a.m. each morning and 8.55 p.m. and 9 p.m. each evening. Dots of about 0.1 second duration were transmitted at each second except for periods marking the minutes and half minutes. The evening programme was duplicated by three white lights (vertical) on the radio mast, the lights being extinguished each second in accordance with the radio programme.
Hourly signals were sent to the General Post Office, Radio Studio, Railway, the associated Telegraph Companies and the Telephone Company.
The errors of the time signals have been published monthly in the Government Gazette.
XI. MISCELLANEOUS.
15. Aviation service.-A synoptic chart of the Far East, on which is also all available information concerning upper winds, is prepared and exhibited in the aerodrome, and a senior officer is available for consultation by departing pilots. An hourly weather report is broadcast daily, usually from 06.00 to 16.00 Hong Kong Standard Time, and is communicated in Q code directly to incoming planes. A route forecast is also furnished to the pilots of outgoing planes.
16. Seismographs. The seismographs have been kept in good order throughout the year, 285 earthquakes were recorded, compared with 372 in 1938. The seismograms have been forwarded to the International Seismological Committee, Oxford. New electrical driving clocks installed in March have performed satisfactorily.
17. Upper Air Research.--Observations of upper air temperature and humidity by means of aeroplane flights to the approximate level of 4 Kilometres were commenced on September 8th, 1938, and continued until the end of March 1939. In all 93 flights were made and acknowledgement is again made to the personnel of the Far East Flying Training School Ltd., and of the Civil Airport. The observations, plotted in the form of entropy diagrams proved of material assistance in forecasting cloud formation, and funds were accordingly provided for a daily flight from April 1st. 269 flights have been accomplished since that date and the results have been of the greatest assistance in providing aviation forecasts, and it is hoped that investigation of the data accumulated will reveal valuable information concerning local atmospheric structure.
Whilst in England the Director was afforded opportunities by the Director of the Meteorological Office and the Superintendent of the Kew Observatory to study the operation of the Thomas and Vaisala radio-sondes. These instruments are practical and reasonable in price, but a shortage of supplies for manufacture etc. will prevent their extensive use, until the termination of hostilities.
18. Lithography.-Lithographic work for other departments was undertaken as follows:--
Botanical & Forestry Department 100 Central British School 200 Colonial Secretariat 11 Kai Tak Airport 1,550 Medical Department 22 Maps 300 > 550F 6
VI.-MAGNETIC OBSERVATIONS.
12. The Magnetic Station at Au Tau has been kept in action throughout the year, and the results of the observations are being prepared for press.
VII. TIME SERVICE.
13. Clocks Cottingham and Mercer 507 (Sidereal) and Leroy 1350 were in use throughout the year. The necessary astronomical observations for the determination of the error of the former were obtained each evening (weather permitting) by the local staff. Observations of the radio time signals emitted by Nauen have been made daily whenever possible during the year and utilised for Clock regulation.
14.
Time Signals were given throughout the year by radio from 9.55 a.m. to 10 a.m. each morning and 8.55 p.m. and 9 p.m. each evening. Dots of about 0.1 second duration were transmitted at each second except for periods marking the minutes and half minutes. The evening programme was duplicated by three white lights (vertical) on the radio mast, the lights being extinguished each second in accordance with the radio programme.
Hourly signals were sent to the General Post Office, Radio Studio, Railway, the associated Telegraph Companies and the Telephone Company.
The errors of the time signals have been published monthly in the Government Gazette.
XI. MISCELLANEOUS.
15. Aviation service.-A synoptic chart of the Far East, on which is also all available information concerning upper winds, is prepared and exhibited in the aerodrome, and a senior officer is available for consultation by departing pilots. An hourly weather report is broadcast daily, usually from 06.00 to 16.00 Hong Kong Standard Time, and is communicated in Q code directly to incoming planes. A route forecast is also furnished to the pilots of outgoing planes.
16. Seismographs. The seismographs have been kept in good order throughout the year, 285 earthquakes were recorded, compared with 372 in 1938. The seismograms have been forwarded to the International Seismological Committee, Oxford. New electrical driving clocks installed in March have performed satisfactorily.
17. Upper Air Research.--Observations of upper air temperature and humidity by means of aeroplane flights to the approximate level of 4 Kilometres were commenced on September 8th, 1938, and continued until the end of March 1939. In all 93 flights were made and acknowledgement is again made to the personnel of the Far East Flying Training School Ltd., and of the Civil Airport. The observations, plotted in the form of entropy diagrams proved of material assistance in forecasting cloud formation, and funds were accordingly provided for a daily flight from April 1st. 269 flights have been accomplished since that date and the results. have been of the greatest assistance in providing aviation forecasts, and it is hoped that investigation of the data accumulated will reveal valuable information concerning local atmospheric structure.
Whilst in England the Director was afforded opportunities by the Director of the Meteorological Office and the Superintendent of the Kew Observatory to study the operation of the Thomas and Vaisala radio-sondes. These instruments are practical and reasonable in price, but a shortage of supplies for manufacture etc. will prevent their extensive use, until the termination of hostilities.
18. Lithography.-Lithographic work for other departments was undertaken as follows :--
Botanical & Forestry Department Central British School
Colonial Secretariat
Kai Tak Airport Medical Department
Maps
100
200
11
1.550
22
300
>
550
وو
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