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 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 190 ships operating in the Far East. These logs, representing 7,222 days' observations, have been utilised for verifying typhoon tracks. The corresponding figures for the year 1923 were 178 and 7,139.
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.
In the following table are given the annual values of the magnetic elements in 1924, as derived from observations made in the new magnetic hut with magnetometer Elliott 83 and dip circle Dover 71-
Declination (west) 0.23.8 Dip (north) 30.42.8 Horizontal Force (C.G.S. unit) 0.37294 Vertical Force (C.G.S. unit) 0.22155 Total Force (C.G.S. unit) 0.43378The vibration and declination observations were made with vibration magnet No. 55, and the deflections with deflection magnet No. 55 in unifilar Elliott No. 83.
Magnet No. 83 which was damaged in 1923, was repaired in England and used on return for declination observations in the New Territory, made with a view to selecting a site for a new Magnetic Observatory. Observations were made in the vicinity of Fanling and Castle Peak on eight occasions. No evidence of serious local magnetic attraction is shown at either site. The site must be accessible, as the photographic sheets of the magnetograph must be changed daily and absolute observations of Horizontal
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 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 Rereived. In addition to meteorological registers kept at about 40 stations in China, meteorological logs were received from 190 ships operating in the Far East. These logs, representing 7,222 days' observations, have been utilised for verifying typhoon tracks. The corresponding figures for the year 1923 were 178 and 7,139.
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 he 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.
In the following table are given the annual values of the magnetic elements in 1924, as derived from observations made in the new magnetic hut with magnetometer Elliott 83 and dip circle Dover 71-
Declination (west)
0.23.8
Dip (north)
30.42.8
Horizontal Force (C.G.S. unit)
0.37294
Vertical Force (U.G.S. unit)
0.22155
Total Force (C.G.S. unif)
0.43378
The vibration and declination observations were made with vibration magnet No. 55, and the deflections with deflection magnet No. 55 in unifilar Elliott No, 83.
Magnet No. 83 which was damaged in 1923, was repaired in England and used on return for declination observations in the New Territory, made with a view to selecting a site for a new Magnetic Observatory. Observations were made in the vicinity of Fanling and Castle Peak on eight occasions. No evidence of serious local magnetic attraction is shown at either site. The site must be accessible, as the photographic sheets of the magnetograph must be changed daily and absolute observations of Horizontal
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