F 16-
IX. MISCELLANEOUS,
Seismograph.-No alterations were made to the seismograph during the year. New needle points were fitted as required. 320 earthquakes were recorded during the year 1930 as against 252 in 1929.
The seismograms have been forwarded to the President of the International Seismological Committee, Oxford, to be dealt with.
Upper Air Research.-325 balloon ascents were made during the year. 34 meteorological flights were made by officers of the R.A.F. before the departure of the carrier, H.M.S. Hermes, on July 28.
The results of the pilot balloon observations have been forwarded monthly to the Secretary of the International Commission for the exploration of the upper air.
The following days were selected by the International Commission as days for international ascents:-January 13-18, May 13-15 and September 15-20. September was chosen as the "International month". Balloon ascents were made on January 13-14, May 13-15 and September 15, 19, and 20.
Special ascents were made at 8.30 a.m. on March 12-14 in connection with R.A.F. bombing practice.
Communication with Stonecutters.-Direct telegraphic communication between the Observatory and Stonecutters Wireless Station was restored on February 18. Communication had been by telephone only since October 1927. For the accurate transmission of weather telegrams, telegraphic tape machines are essential.
Course in Meteorology.-Lieut. A. St. J. Edwards, R.N., H.M.S. Hermes, Assistant to Senior Observer, took a course in meteorology at the Observatory from February 24 to March 23.
Short wave experimental emissions.-Watch was kept at the Observatory Wireless Station for the short wave experimental emissions from Paris and Lyons on January 11-18, May 31, June 7, 14, 21, 28, November 22, 29, December 6, 13.
The signals of the first two series were heard at varying strengths, but those of the third series were not heard at Hong Kong.
-
F 16-
IX. MISCELLANEOUS,
Seismograph.-No alterations were made to the seismograph during the year. New needle points were fitted as required. 320 earthquakes were recorded during the year 1930 as against 252 in 1929.
The seismograms have been forwarded to the President of the International Seismological Committee, Oxford, to be dealt with.
Upper Air Rescarch.-325 balloon ascents were made during the year. 34 meteorological flights were made by officers of the R.A.F. before the departure of the carrier, H.M.S. Hermes, on July 28.
The results of the pilot balloon observations have been forwarded monthly to the Secretary of the International Commis- sion for the exploration of the upper air.
The following days were selected by the Internationa! Commission as days for international ascents:-January 13-18. May 13-15 and September 15-20. September was chosen as the "International month". Balloon ascents were made on January 13-14, May 13-15 and Sepetmber 15, 19, and 20.
Special ascents were made at 8.30 a.m. on March 12-14 in connection with R.A.F. bombing practice.
Communication with Stonecutters.-Direct telegraphic com- munication between the Observatory and Stonecutters Wireless Station was restored on February 18.
on February 18. Communication had been by telephone only since 1927, October. For the accurate transmission of weather telegrams telegraphic tape machines are essential.
Course in Meteorology.-Lieut. A. St. J. Edwards, R.N., H.M.S. Hermes, Assistant to Senior Observer, took a course in meteorology at the Observatory from February 24 to March 23.
Short wave experimental emissions.-Watch was kept at the Observatory Wireless Station for the short wave experi- mental emissions from Paris and Lyons on January 11-18. May 31, June 7, 14, 21, 28, November 22, 29, December 6,13.
The signals of the first two series were heard at varying strengths, but those of the third series were not heard at Hong Kong.
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