F 10
The Night Signals are displayed at sunset, at the following stations :-
Royal Observatory Harbour Office
H. M. S. Tamar Gough Hill
Railway Station
They have the same signification as the day signals.
A translation of both Day and Night Signals is displayed at the General Post Office and at the Upper Tram Station.
When local signals are displayed in the Harbour a Cone is exhibited at the following stations :-
Gap Rock Waglan
Stanley Sau Ki Wan Sha Tau Kok Aberdeen Sai Kung
Tai Po
In the following table is given the number of hours the local signal were hoisted in each of the years 1921-1925 :-
Year Red Signals.Number of hours hoisted. Black Signals.
Number of times fired. Bombs.
Number of times fired. 1921 94 121 1922 181 154 1923 181 252 1924 186 85 · 1925 128 57 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 158 ships operating in the Far East. These logs, representing 6,697 days' observations have been utilised for amplifying the weather maps and verifying typhoon tracks. The corresponding figures for the year 1924 were 190 and 7,222.