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IV.—A Note on the Secular Changes of Rock Temperature on the Calton Hill
Published online by Cambridge University Press: 15 September 2014
Extract
1. The observations of rock temperature on the Calton Hill have recently been analysed by Mr R. W. Wrigley, with a view to the discovery of changes going on gradually and independent of weather conditions. Mr Wrigley took groups of years, such that the mean air temperature was the same for each group, and found the mean rock temperature for like periods. He trusted that in this way he would be able “to get rid of the surface temperature variations.” The result of the calculations was that for different periods in which the mean air temperature was the same the temperature of the rock might vary by half a degree Fahrenheit. The rock temperature had a maximum about 1856, fell until 1892, and rose after that date.
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- Copyright © Royal Society of Edinburgh 1932
References
page 19 note * Proc. Roy. Soc. Edin., vol. 1 (1930), p. 153.
page 20 note * Mr Wrigley does not state explicitly his reasons for adjusting the times in this way. Some curves prepared by Heath (Trans. Roy. Soc. Edin., vol. xl (1901), Pl. I) indicate that such waves of temperature as it is desired to eliminate take only six months to reach the depth of 21 feet.
For the earlier years the annual means of air temperature were taken from Mossman's account of the climate of Edinburgh. For the years from 1896 onwards the means refer to Blackford Hill.
page 21 note * In the notation of the next paragraph wave-length in the uppermost rock
page 21 note † Heath, loc. cit., p. 185.