F 4
The Annual Values are given below.--
Year. Factor. Year. Factor.
1910 2.25 1918 2.06
1911 2.27 1919 1.97
1912 2.42 1920 1.72
1913 2.39 1921 1.74
1914 2.22 1922 1.81
1915 2.11 1923 1.67
1916 2.30 1924 2.07
1917 1.95
The figures may be grouped into three periods; 1910-1916, 1917-1919 and 1920-1923. The means for these periods are 2.27, 1.99 and 1.73.
No explanation of these relatively large variations can be given. The instrument is carefully tended, and calibrated once a year.
As an instance of the baffling behaviour of this instrument it may be mentioned that in January and February the factor showed a distinct variation with velocity, whereas in August and December although large variations occur they appear to be independent of the velocity.
The scale value of the direction apparatus was halved on August 15th, to obviate loss of register owing to the pen travelling off the sheet in variable winds.
Thermometers. All thermometers in use are compared with Kew Standard No. 647 in winter and summer.
Richard Thermograph.—A buzzer, operated each minute, was fitted to the thermometer frames on April 2nd, but the base lines laid down on the thermograms from the hourly observations of rotating thermometers still show large irregularities except on dull days, with a small range of temperature.
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
F 4
The Annual Values are given below.--
Year.
Factor.
·
lear.
Factor.
1910
2.25
1918
2:06
1911
2'27
1919
1'97
1912
2'42
1920
1-72
1913
2.39
1921
174
1914
2.22
1922
1.81
1915
2.II
1923
1.67
1916
2.30
1924
2'07
1917
195
The figures may be grouped into three periods; 1910-1916, 1917-1919 and 1920-1923. The means for these periods are 2.27, 1.99 and 1.73.
No explanation of these relatively large variations can be given. The instrument is carefully tended, and calibrated once a
year.
As an instance of the baffling behaviour of this instrument it. may be mentioned that in January and February the factor showed a distinct variation with velocity, whereas in August and December although large variations occur they appear to be independent of the velocity.
The scale value of the direction apparatus was halved on August 15th, to obviate loss of register owing to the pen travelling off the sheet in variable winds.
Thermometers.All thermometers in use are compared with Kew Standard No. 647 in winter and summer.
Richard Thermograph.—A buzzer, operated each minute, was fitted to the thermometer frames on April 2nd, but the base lines laid down on the thermograms from the hourly observations of rotating thermometers still show large irregularities except on dull days, with a small range of temperature.
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
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