F 11.
In the following table is given the number of hours the local signals were hoisted in each of the years 1919-1923 :
Year. Red Signals.The figures in the above table include the number of hours that night signals, corresponding to the day signals, were hoisted.
The red signal indicates that a depression exists which may possibly cause a gale at Hongkong within 24 hours. The black signals indicate that a gale is expected at Hongkong.
Three bombs fired at intervals of 10 seconds indicate that wind of typhoon force is anticipated.
VI.—METEOROLOGICAL Observations from SHIPS, TREATY Ports, &c.
Logs received. In addition to meteorological registers kept at about 40 stations in China, meteorological logs were received from 178 ships operating in the Far East. These logs, representing 7139 days' observations, have been utilised for verifying typhoon tracks. The corresponding figures for the year 1922 were 172 and 5763.
Comparison of Barometers.—The corrections to ships' barometers are usually obtained by comparing their readings while at Hongkong with those of the Observatory Standard. Occasionally ship captains bring their barometers to the Observatory to be compared with the Observatory Standard.
VII—MAGNETIC OBSERVATIONS.
Horizontal force, declination, and dip are observed once a month. In the dip observations 4 needles are used in rotation, the result for each month being the mean of determinations with two needles.
- F 11.
F11
In the following table is given the number of hours the local signal were hoisted in each of the years 1919-1923 :
Red Signals.
Black Signals.
Bombs.
Year.
Number of hours hoisted.
Number of times fired.
1919
78
105
1920
107
156
1921
94
121
1922
ISI
154
1923
181
252
2
The figures in the above table include the number of hours that night signals, corresponding to the day signals, were hoisted.
The red signal indicates that a depression exists which may possibly cause a gale at Hongkong within 24 hours. The black signals indicate that a gale is expected at Hongkong.
Three bombs fired at intervals of 10 seconds indicate that wind of typhoon force is anticipated.
VI.-METEOROLogical Observations from SHIPS, TREATY Ports, &c.
Logs received. In addition to meteorological registers kept at about 40 stations in China, meteorological logs were received from 178 ships operating in the Far East. These logs, representing 7139 days' observations, have been utilised for verifying typhoon tracks. The corresponding figures for the year 1922 were 172 and 5763.
Comparison of Barometers.-The corrections to ships' baro- ineters are usually obtained by comparing their readings while at Hongkong with those of the Observatory Standard. Occasionally ship captains bring their barometers to the Observatory to he com- pared with the Observatory Standard.
VII-MAGNETIC OBSERVATIONS.
Horizontal force, declination, and dip are observed once a month. In the dip observations 4 needles are used in rotation, the result for each month being the mean of determinations with two needles.
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