| Description | 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 flint glass; barometer 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 Twenty-five successive hours. Commencing 6. A.M. of the 21st Setr. 1839 and ending 6. A.M. of the following day. Greeenwich mean time. By Mr. J.D. Roberton, Assistant Secretary, Royal Society'. Some slight arithmetical workings verso.
Pencil note at the foot of the observations: 'Proof to be sent to Mr. Roberton by post at J. Colquhoun's Parson's Hill Woolwich'. |