F 9
When a local storm warning is displayed at the Observatory a cone is exhibited at several outlying stations for the benefit of native craft and passing ocean vessels.
In the following table is given the number of hours the local signals were hoisted in each of the years 1912-1921 :
Year Number of hours hoisted Number of times fired Red Signals Black Signals 1912 151 1913 146 1914 146 1915 64 1916 70 1917 102 1918 33 201 36 102 1919 78 1920 107 105 156 1921 94 121 164 189 178 1The figures in the above table include the number of hours that night signals, corresponding to the day signals, were hoisted.
The red signals indicate that a depression exists which may cause a gale at Hongkong within 24 hours. The black signals indicate that a gale is expected at Hongkong.
Prior to July 1917, the red signals indicated that the centre of the typhoon was believed to be more than 300 miles distant, and the black less than 300 miles; the returns for 1912-1916 are therefore not strictly comparable with those for 1917-1921.
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 18 ships operating in the Far East. These logs, representing 5662 days' observations, have been utilised for verifying typhoon tracks. The corresponding figures for the year 1920 were 170 and 5872.
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.
* Three bombs fired at intervals of 10 seconds indicate that wind of typhoon force is anticipated,
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F 9
When a local storm warning is displayed at the Observatory a cone is exhibited at several outlying stations for the benefit of native craft and passing ocean vessels.
In the following table is given the number of hours the local signals were hoisted in each of the years 1912-1921 :~~
Bombs. *
!
Red Signals.
Black Siguals.
Year.
Number
Number of hours hoisted.
of times fired.
なない
:
1912
151
1913
146
1914
146
1915
64
1916
70
1917
102
1918
33
I 20
201
36
102
1919
78
1920
107
105 156
1921
:
9+
121
164
189
178
1
The figures in the above table include the number of hours that night signals, corresponding to the day signals, were hoisted.
The red signals indicate that a depression exists which may cause a gale at Hongkong within 24 hours. The black signals indicate that a gale is expected at Hongkong.
Prior to July 1917, the red signals indicated that the centre of the typhoon was believed to be more than 300 miles distant, and the black less than 300 miles; the returns for 1912-1916 are therefore not strictly comparable with those for 1917-1921.
VI. --METEOROLOGICAL. OBSERVATIONS FROM ŠÍPS.
TREATY PORTS, &c.
Logs received. In addition to meteorological registers kept at about 40 stations in China, meteorological logs were received from 18 ships operating in the Far East. These logs, representing 5662 days' observations, have been utilised for verifying typhoon tracks. The corresponding figures for the year 1920 were 170 and 5872.
Comparison of Barometers.---The corrections to ships' baro- meters 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.
* Three bombs fired at intervals of 10 seconds indicate that wind of typhoon force is anticipated,
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