F4-
Thermometers. All thermometers in use were compared with Kew Standard No. 647 in winter and summer.
A new Standard was obtained from Messrs. Gallenkamp in November. It reads 0.04 (F) lower than the Kew Standard, No. 647, at 60° F.
Hygrograph for Underground Room-In November a small dry and wet bulb hygrograph, of the bi-metallic spiral type, was set up in the Underground Room. The record is obtained on a drum 5 inches high and 3.4 inches in diameter. Both dry and wet bulb records are time-scaled by an hourly signal from the mean time clock which operates an electro-magnet and causes the armature to engage in a toothed wheel concentric with the axis of the spiral thermometers. This moves the pen sufficiently to make a distinct mark on the paper, the record being quite smooth.
When the record shows rapid movements, such as in the case of an ordinary thermograph exposed to the outside air, the system of time-breaks is more satisfactory than time-marks.
Richard Thermograph.-The base lines laid down on the Richard thermograms from the hourly observations of rotating thermometers still show larger irregularities than might be expected, seeing that the thermograph is mounted in a well-ventilated Indian pattern shed, and that the thermometers are aspirated automatically during the last five minutes of each hour.
III. METEOROLOGICAL OBSERVATIONS AT THE OBSERVATORY.
Automatic records of the temperature of the air and evaporation were obtained with a Richard dry and wet bulb thermograph, and of the direction and velocity of the wind with a Beckley and a Dines-Baxendell anemograph, modified as described in the report for 1912. The amount of rain is recorded automatically by a Nakamura pluviograph, the amount of sunshine by two Campbell-Stokes universal sunshine recorders, and the relative humidity of the air by a small Richard hair hygrograph. Eye observations of barometric pressure, temperature of the air and of evaporation and the amount of cloud are made at each hour of Hongkong Standard time. The character and direction of the motion of the clouds are observed every three hours. Daily readings are taken of self-registering maximum and minimum thermometers.
Principal features of the Weather.-The principal features of the weather in 1923, were:-
(a) Drought in January, February, March and May, and abnormally heavy rains in June, July, August and October.
F4-
Thermometers. All thermometers in use were compared with Kew Standard No. 647 in winter and summer.
A new Standard was obtained from Messrs. Gallenkamp in November. It reads 004 (F) lower than the Kew Standard,
No. 647, at 60° F.
Hygrograph for Underground Room-In November a small dry and wet bulb hygrograph, of the bi-metallic spiral type, was set up in the Underground Room. The record is obtained on a drum 5 inches high and 34 inches in diameter. Both dry and wet bulb records are time-scaled by an hourly signal from the mean time clock which operates an electro-magnet and causes the arma- ture to engage in a toothed wheel concentric with the axis of the spiral thermometers. This moves the pen sufficiently to make a distinct mark on the paper, the record being quite smooth.
When the record shows rapid movements, such as in the case of an ordinary thermograph exposed to the outside air, the system of time-breaks is more satisfactory than time-marks.
Richard Thermograph.-The base lines laid down on the Richard thermograms from the hourly observations of rotating thermometers still show larger irregularities than might be ex- pected, seeing that the thermograph is mounted in a well ventilated Indian pattern shed, and that the thermometers are aspirated auto- matically during the last five minutes of each hour.
III. METEORological OBSERVATIONS AT THE OBSERVATORY.
Automatic records of the temperature of the air and evapora- tion were obtained with a Richard dry and wet bulb thermograph, and of the direction and velocity of the wind with a Beckley and a Dines-Baxendell anemograph, modified as described in the report for 1912. The amount of rain is recorded automatically by a Nakamura pluviograph, the amount of sunshine by two Campbell- Stokes universal sunshine recorders, and the relative humidity of the air by a small Richard hair hygrograph. Eye observations of barometric pressure, temperature of the air and of evaporation and the amount of cloud are made at each hour of Hongkong Standard time. The character and direction of the motion of the clouds are observed every three hours. Daily readings are taken of self-regis- tering maximum and minimum thermometers.
Principal features of the Weather.-The principal features of the weather in 1923, were:-
(a) Drought in January, February, March and May, and abnormally heavy rains in June, July, August and October.
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