Meteorological observations at the Royal Society, London, by John David Roberton Hourly meteorological observations made at the Royal Society's apartments at Somerset House, London, at the September (Autumn) equinox. Columns for: hours of observation; barometer corrected flint glass; barometer corrected crown glass; attached thermometer; external thermometer; old standard barometer; attached thermometer; difference of wet and dry bulb thermometer; dew point; rain in inches; wind; with general remarks. Headed: 'Meteorological Observations made at the Apartments of the Royal Society, Somerset House, for Forty-five successive hours. Commencing 6. A.M. of the 21st Septr. 1841 and ending 2. A.M. of the 23rd. Greeenwich mean time. By Mr. John D. Roberton, Assistant Secretary, Royal Society'. 21-23 September 1841