Appendix F.
REPORT OF THE DIRECTOR
OF THE ROYAL OBSERVATORY, HONG KONG,
FOR THE YEAR 1926.
I.-GROUNDS AND BUILDINGS.
The grounds were kept in order by the Botanical and Forestry Department with the assistance of the Observatory coolies.
The wireless house was completed in November and the receiving set was removed from its temporary shelter in the old Telescope dome to the new house on November 30. This house is situated 51 yards to the south of the main building. It is a rectangular building, 44 feet long by 18 feet wide, with brick walls 12 feet high at the eaves, and a gabled roof of Canton tiles. It contains an engine and battery room, 18 feet long by 12 feet wide, and a main instrument room 32 feet long by 18 feet wide. The Receiver is a Marconi "Press" type RP 2 B, with a wave range of 750 to 26,000 metres. The Transmitter is a Marconi type "Q", 13 Kw. with wave range of 250 to 1,000 metres. Frequency 300 cycles. The systems used are:---
Continuous wave.
Interrupted Continuous wave. Telephone.
Underground Chamber for Seismograph and Clocks.-The diurnal inequality of temperature in the underground chamber is negligible and the change in 24 hours seldom exceeds 0°.3 F. The annual range amounted to 11°.3 (F) in 1925 and 9°.1 (F) in 1926. Changes of humidity are at times considerable; as, for example, from January 15d. 21h. to 16d. 13h. when the relative humidity decreased from 71% to 51%, from March 12d. 12h. to 13d. 2h. when it increased from 61% to 85%, from May 7d. 16h. to 8d. 9h., when it decreased from 90% to 65%, and from December 7d. 17h. to 8d. 12h. when it decreased from 75% to 55%. From June 22 to September 17 the humidity was never less than 93%.
In the following table the mean monthly temperature and humidity in the Underground Chamber are compared with the temperature and humidity in the open air. As the air in the Underground Chamber is always still, humidity tables for calm air have been computed and used for obtaining the relative humidity from the readings of the dry and wet bulb thermometers.
Appendix F.
REPORT OF THE DIRECTOR
OF THE ROYAL OBSERVATORY, HONG KONG,
FOR THE YEAR 1926.
I.-GROUNDS AND BUILDINGS.
The grounds were kept in order by the Botanical and Forestry Department with the assistance of the Observatory coolies.
The wireless house was completed in November and the receiving set was removed from its temporary shelter in the old Telescope dome to the new house on November 30. This house is situated 51 yards to the south of the main building. It is a rectangular building. 44 feet long by 18 feet wide, with brick walls 12 feet high at the eaves, and a gabled roof of Canton tiles. It contains an engine and battery room, 18 feet long by 12 feet wide, and a main instrument room 32 feet long by 18 feet wide. The Receiver is a Marconi "Press" type RP 2 B, with a wave range of 750 to 26,000 metres. The Transmitter is a Marconi type "Q", 13 Kw. with wave range of 250 to 1,000 metres. Frequency 300 cycles. The systems used are:---
Continuous wave.
Interrupted Continuous wave. Telephone.
Underground Chamber for Seismograph and Clocks.-The diurnal inequality of temperature in the underground chamber is negligible and the change in 24 hours seldom exceeds 0°.3 F, The annual range amounted to 11°.3 (F) in 1925 and 9°.1 (F) in 1926. Changes of humidity are at times considerable; as, for example, from January 15d. 21h. to 16d. 13h. when the relative. humidity decreased from 71% to 51%, from March 12d. 12h. to 13d. 2h. when it increased from 61% to 85%, from May 7d. 16h. to 8d. 9h., when it decreased from 90% to 65%, and from December 7d. 17h, to 8d. 12h. when it decreased from 75% to 55%. From June 22 to September 17 the humidity was never less than 93%.
In the following table the mean monthly temperature and humidity in the Underground Chamber are compared with the temperature and humidity in the open air. As the air in the Underground Chamber is always still, humidity tables for calm air have been computed and used for obtaining the relative humidity from
from the readings of the dry and wet bulb
thermometers.
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