F 3
and turns once in 24 hours. The electrical time-break apparatus was completed on 1917 April 22. The pens are lifted from the paper, for the first three minutes of each hour, by a make-contact on one of the electric dials. The thermometers are aspirated from the 59th to the 60th minute of each hour by an electric fan, operated by a similar contact on another dial, air being drawn into the shelter through a 14-inch zinc pipe. Comparison between the eye observations of thermometers rotated in the open air and the records of the Richard thermograph indicate that the relation between the temperature in the shelter and in the open air is not constant.
The effect of the electric fan on the wet bulb thermometer under varying conditions of temperature, humidity, and wind has been discussed. Further particulars are given under the heading Miscellaneous.
Peak Anemograph.—An electric time scaling apparatus was fitted to the Beckley Anemograph at Victoria Peak in the month of May. The spiral pencils are lifted from the paper by an electro-magnet, operated by an hourly signal from the Observatory, and held by a trigger which is released 10 minutes after the hour by mechanism fitted to the driving clock.
III.—METEOROLOGICAL OBSERVATIONS AT THE OBSERVATORY,
Continuous photographic records showing the variations of barometric pressure and temperature of the air and of evaporation were obtained with the Kew barograph and the Richard dry and wet bulb thermograph, also automatic records 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 a Campbell-Stokes universal sunshine recorder, 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 were made at each hour of Hongkong Standard time. The character and direction of motion of the clouds were observed every three hours. Daily readings were taken of self-registering maximum and minimum thermometers.
Principal Features of the Weather.—The principal features of the weather in 1918 were:
(a) The continuance until the end of February of the fine dry weather which commenced at the beginning of November 1917.
(b) The heavy rains of June (24·795), August (29·230 ins.) and September (18·450 ins.).
(c) A typhoon which passed about 40 miles to the south-west of Hongkong, on the morning of August 15.
January was a record month as regards most elements. Barometric pressure and sunshine were the greatest on record, and
F 3
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and turns once in 24 hours. The electrical time-break apparatus was completed on 1917 April 22. The pens are lifted from the paper, for the first three minutes of each hour, by a make-contact on one of the electric dials. The thermometers are aspirated from the 59th to the 60th minute of each hour by an electric fan, operated by a similar contact on another dial, air being drawn into the shelter through a 14-inch zinc pipe. Comparison between the eye obser- vations of thermometers rotated in the open air and the records of the Richard thermograph indicate that the relation between the temperature in the shelter and in the open air is not constant.
The effect of the electric fan on the wet bulb thermometer under varying conditions of temperature, humidity, and wind has been discussed. Further particulars are given under the heading Miscellaneous.
Peak Anemograph.-Au electric time scaling apparatus was fitted to the Beckley Anemograph at Victoria Peak in the month of May. The spiral pencils are lifted from the paper by an electro- magnet, operated by an hourly signal from the Observatory, and held by a trigger which is released 10 minutes after the hour by mecha- nism fitted to the driving clock.
III.--METEOrological OBSERVATIONS AT THE OBSERVATORY,
Continuous photographic records showing the variations of barometric pressure and temperature of the air and of evaporation were obtained with the Kew barograph and the Richard dry and wet bulb thermograph, also automatic records of the direction and velocity of the wind with a Beckley and a Dines-Baxendell anemo- graph, modified us described in the Report for 1912. The amount of rain is recorded automatically by a Nakamura pluviograph, the amount of sunshine by a Campbell-Stokes universal sunshine re- corder, 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 were made at each hour of Hongkong Standard time. The character and direction of motion of the clouds were observed every three hours. Daily readings were taken of self-registering maxinum and minimum
thermometers. ·
Principal Features of the Weather.--The principal features of the weather in 1918 were:-
(a) The continuance until the end of February of the fine
dry weather which commenced at the beginning of November 1917.
(6). The heavy rains of June (24-795) August (29-230ins )
and September (18·4501 ).
(c) A typhoon which passed about 40 miles to the south- west of Hongkong, on the morning of August 15.
January was a record month as regards most elements. Baro- metric pressure and sunshine were the greatest on record, and
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