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 March (Spring) 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-two hours. Commencing 6. A.M. of the 21st March 1842, and ending 11. P.M. of the following day. Greenwich mean time. By Mr. John D. Roberton, Assistant Secretary, Royal Society'. 21-22 March 1842