Magnetic and meteorological observations at the Madras Magnetic Observatory, India, by Samuel Owen Edgar Ludlow Hourly observations made at Madras [Chennai] of the declination, horizontal force, and vertical force magnetometers, commencing from 10.00p.m. on 20 January [Gottingen Mean Time] and continuing to 9.00p.m. on 21 January 1841. With uncorrected readings of the barometer and attached thermometer, and dry and wet bulb thermometer over the same period. With general remarks on the state of the weather. There is an electrometer column which is not completed. Headed 'Abstract of Term-day Observations'. Signed [p.3]: 'S.O.E. Ludlow Supt. Madras Magl. Obsy.'. 20-21 January 1841