Abstract of Paper on further Results of Mr Wragge's Ben Nevis Observations, taken in the year 1882

Extract

The more prominent results of Mr Wragge's work were discussed by Dr Buchan in a paper on the “Meteorology of Ben Nevis,” published in the Journal of the Scottish Meteorological Society (vol. vii. p. 4). The humidities at the intermediate stations on the hill-side have not, however, as yet been discussed. One reason for this was that, until Dr Herbertson and Mr H. N. Dickson carried out their researches on hygrometry at Ben Nevis Observatory, it was not known how far Glaisher's tables could be regarded as reliable at high-level stations. Their experiments, however, showed that for temperatures above 40°, Glaisher's factors could be used except when the air was excessively dry. As Mr Wragge's observations were taken between June and October, when the temperature was relatively high and the air nearly saturated, Glaisher's tables have been employed to compute the humidity and vapour pressure from the dry and wet bulb readings.