F 12
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 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 PORTS, &c.
Logs received. In addition to meteorological registers kept at about 40 stations in China, meteorological logs were received from 230 ships operating in the Far East. These logs, representing 8,680 days' observations have been utilised for amplifying the weather maps and verifying typhoon tracks. The corresponding figures for the year 1925 were 158 and 6,697.
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 Observatory Standard.
VII. MAGNETIC OBSERVATIONS.
Magnetic 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.
In the following table are given the annual values of the magnetic elements in 1926, as derived from observations made in the new magnetic hut with magnetometer Elliott 83 and dip circle Dover 71:-
Declination (West) Dip (North) Horizontal Force (C.G.S. unit) Vertical Force (C.G.S. unit) Total Force (C.G.S. unit) 0.29.6 30.42.4 0.37323 0.22167 0.43409The magnetic observatory buildings at Au Tau, for absolute observations and photographic registration of the magnetic horizontal force, vertical force, and declination were commenced in November. It is expected that they will be completed in February 1927.
The vertical force variometer was received on April 30, the horizontal force and declination variometers and earth inductor on June 22. These instruments are similar to those...
F 12
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 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 OBERVATIONS FROM SHIPS, TREATY PORTS, &c.
Logs received. In addition to meteorological registers kept at about 40 station in China, meteorological logs were re- ceived from 230 ships operating in the Far East. These logs, representing 8,680 days' observations have been utilised for amplifying the weather maps and verifying typhoon tracks. The corresponding figures for the year 1925 were 158 and 6,697.
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 Observa- tory to be compared with the Observatory Standard.
VII. MAGNETIC OBSERVATIONS.
Magnetic 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 determi- nations with two needles.
In the following table are given the annual values of the magnetic elements in 1926, as derived from observations made in the new magnetic hut with magnetometer Elliott 83 and dip circle Dover 71:-
Declination (West)
Dip (North)
Horizontal Force (C.G.S. unit) Vertical Force (C.G.S. unit)
Total Force (C.G.S. unit)
0.29.6
30.42.4
0.37323
0.22167
0.43409
The magnetic observatory buildings at Au Tau, for absolute observations and photographic registration of the magnetic horizontal force, vertical force, and declination were commenced in November. It is excepted that they will be completed in February 1927.
The vertical force variometer was received on April 30, the horizontal force and declination variometers and earth in- ductor on June 22. These instruments are similar to those
No comments yet.
Private notes are available after approval.