F 11
In the following table are given the number of times and number of hours the local signals were hoisted in each of the years 1926-1930,
Year. Red Signals. Black Signals. Bombs. Number of times. Number of hours displayed. Number of times. Number of hours displayed. Number of times fired. 1926 100 50169 + 103 I 4 1927 61 I 1928 ΤΟ 58 1929 3 28 46 I 1930 5 88 3 37The 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 indicates that a depression or typhoon exists which may possibly cause a gale at Hong Kong within 24 hours. The black signals indicate that a gale is expected at Hong Kong.
Three bombs fired at intervals of 10 seconds indicate that wind of typhoon force is anticipated.
VI. METEOROLOGICAL OBSERVATIONS FROM SHIPS, TREATY FORTS, ETC.
Logs received. In addition to meteorological registers kept at about 40 stations in China, meteorological logs were received from 192 ships operating in the Far East. These logs, representing 10,273 days observations have been utilised for amplifying the weather maps and verifying typhoon tracks. The corresponding figures for the 1929 were 197 and 10,153.
Comparison of Barometers.-The corrections to ships' barometers are usually obtained by comparing their readings while at Hong Kong with those of the Observatory Standard. Occasionally ship captains bring their barometers to the Observatory to be compared with the Standard.
VII. MAGNETIC OBSERVATIONS.
From the beginning of 1928 magnetic horizontal force, declination and dip have been determined at the Au Tau Station weekly, when possible. The instruments used are a magnetometer by Cook, Troughton & Simms, No. 31, and an earth inductor by the Cambridge Instrument Co. C65818. In the following
F 11
In the following table are given the number of times and number of hours the local signals were hoisted in each of the years 1926-1930,
Red Signals.
Black Signals.
Year.
Number of
Number of hours
Number
Number of
times.
times.
displayed.
of hours displayed.
Bombs.
Number
of times
fired.
1926
1927
100
50 169
+
103
I
4
61
I
1928
ΤΟ
58
1929
3
28
46
I
1930
5
88
3
37
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
indicates that a depression or typhoon exists which may possible cause a gale at Hong Kong within 24 hours. The black signals indicate that a gale is expected at Hong Kong.
Three bombs fired at intervals of 10 seconds indicate that wind of typhoon force is anticipated.
VI. METEOROLOGICAL OBSERVATIONS FROM SHIPS. TREATY FORTS, ETC.
Logs received. In addition to meteorological registers kept at about 40 stations in China, meteorological logs were received from 192 ships operating in the Far East. These logs, representing 10,273 days observations have been utilised for amplifying the weather maps and verifying typhoon tracks. The corresponding figures for the 1929 were 197 and 10,153.
Comparison of Barometers.-The corrections to ships barometers are usually obtained by comparing their readings while at Hong Kong with those of the Observatory Standard. Occasionally ship captains bring their barometers to the Observatory to be compared with the Standard.
VII. MAGNETIC OBSERVATIONS.
From the beginning of 1928 magnetic horizontal force. declination and dip have been determined at the Au Tau Station weekly, when possible. The instruments used are a magnetome- ter by Cook, Troughton & Simms, No. 31, and an earth inductor by the Cambridge Instrument Co. C65818. In the following
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