B 2
removed, and the record obtained directly on the cylinder. This has had the desired effect. The fact that the effective diameter of the cylinder increases with each successive layer of paper is unimportant, as the time-break is made electrically by an independent clock,
The monthly results of comparisons with the records of the Beckley Anemograph since the installation of the Dines instrument in April, 1910, are given below :—
Month 1910 1911 1912 1913 1914 January 2.30 2.12 2.54 February 2.32 2.30 2.40 March 2.35 2.25 2.33 April 2.33 2.26 2.25 May 2.12 2.34 2.22 2.13 June 2.10 2.44 2.09 2.13 July 2.21 2.57 2.28 2.26 August 2.25 2.65 2.39 2.18 September 2.31 2.49 2.81 2.22 October 2.27 2.51 2.69 2.08 November 2.27 2.47 2.71 2.08 December 2.31 2.24 2.54 2.07 Year 2.25 2.41 2.39 2.22Factor (Dines Beckley).
Kew Thermograph. This instrument was mounted in the new thermograph shed in the month of January, and a 12-inch electric fan set up in the shed in a 14-inch zinc pipe, at a distance of 6 feet from the thermometers. The fan is operated from the 59th to the 60th minute of each hour by a contact on one of the mean time electric dials, so that exactly at the hour, when the thermogram is measured, the wet bulb thermometer should show the true temperature of evaporation. It was found however that with the fan at this distance the air current produced over the thermometers was very feeble; the fan was therefore moved 2 feet nearer the thermometers which are now well aspirated every hour.
Aneroid barometer tester. This apparatus was received in the month of August. A teak cover was obtained locally to protect it from breakage. It consists of two glass cylinders, one 4 inches in diameter and 6 inches high, containing the cistern of a mercurial barometer, and the other 10 inches in diameter and 6 inches high for receiving the aneroid barometer to be tested. The glass cylinders rest on brass plates and are connected by a pipe to an air pump.
B 2
—
removed, and the record obtained directly on the cylinder. This has had the desired effect. The fact that the effective diameter of the cylinder increases with each successive layer of paper is un- important, as the time-break is made electrically by an independent clock,
The monthly results of comparisons with the records of the Beckley Anemograph since the installation of the Dines instrument in April, 1910, are given below :—
Factor (Dines Beckley).
3
Month.
igio.
1911.
1912.
1913.
1914.
January,
2.33
2.30
2.12
2'54
February,
2'34
2.32
2°30
2'40
March,
2:30
2.35
2.25
2°33
April,.
2°27
2.33
2:26
2.25
May.
2.23
༡་༢་
2.34
2°22
2.13
June,
2.23
2'10
2*44
2.09
2*13
July,
2'14
2'21'
2'57
2*28
2.26
August,
2'07
2.25
2·65
2.39
2.18
September,
2.18
2.31
2'49
2.81
2.22
October,
2°30
2.27
2:51
2.69
2:08
November,
2.28
2*27
2:47
2'71
2:08
December,
2.23
2.31
2.24
2.54
2:07
Year,
2.25
2.29
2'41
2°39
2*22
Kew Thermograph. This instrument was mounted in the new thermograph shed in the month of January, and a 12-inch electric fan set up in the shed in a 14-inch zinc pipe, at a distance of 6 feet from the thermometers. The fan is operated from the 59th to the 60th minute of each hour by a contact on one of the mean time electric dials, so that exactly at the hour, when the thermogram is measured, the wet bulb thermometer should show the true temperature of evaporation. It was found however that with the fan at this distance the air current produced over the thermometers was very feeble; the fan was therefore moved 2 feet nearer the thermometers which are now well aspirated every hour.
Aneroid barometer tester. This apparatus was received in the month of August. A teak cover was obtained focally to protect it from breakage. It consists of two glass cylinders, one 4 inches in diameter and 6 inches high, containing the cistern of a mercurial barometer, and the other 10 inches in diameter and 6 inches high for receiving the aneroid barometer to be tested. The glass cylinders rest on brass plates and are connected by a pipe to an air pump.
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