Meteorological observations at London, England, by William Bone [?] Meteorological observations commencing at 8.00am on 21 March and ending at 12.00pm on 22 March 1842 [March equinox]. The readings were taken at fifteen minute intervals at 12 Percy Street, Bedford Square, London. Columns for barometer, attached thermometer, and external thermometer. Commencing with a heading and remarks [p.1] including: 'The instrument used was a Siphon Barometer, cinstructed to read off at both ends, by Mr. Jones of Charing Cross, on the plan of Gay Lussac'. Signed 'W. Bone 12 Percy Street, Bedford Square'. Endorsed [p.4]: '1842 March 20th & 21st For forty successive hours by W. Bone, 12 Percy Street, Bedford Square'. 20-21 March 1842