Meteorological observations at Madras [Chennai], India, by John Warren Daily meteorological observations, arranged in monthly tables. Columns for date, barometer readings at sunrise, 10.00am, noon, 3.00pm and sunset, with attached and exposed thermometer readings at corresponding times; rain gauge readings at sunrise and sunset, wind direction and general weather remarks. With greatest, least, and medium barometer and thermometer values; and hygrometer readings at sunrise, 10.00am, noon, 3.00pm and sunset. A final summary table [p.26] gives '...Medium, Greatest and Least Heights with the Extreme Difference of the Barometer, and Thermometer Attached & Exposed in the Year 1810'. Inscribed in pencil [p.1]: 'Madras Observatory'. A footnote [p.24] is signed: 'J. Warren, Astronomer'. Data rescue available: Allan, R.J., Reason, C.J.C., Carroll, P. and Jones, P.D. (2002), A reconstruction of Madras (Chennai) mean sea-level pressure using instrumental records from the late 18th and early 19th centuries. Int. J. Climatol., 22: 1119-1142. 1 January-31 December 1810