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 October [Gottingen Mean Time] and continuing to 9.00p.m. on 21 October 1841. With readings of the barometer and attached thermometer, and dry and wet bulb thermometer over the same period. There are general remarks on the state of the weather, and a column for electrometer readings, which has been used to record wind direction. Headed 'Abstract of Term-day Observations'. Signed [p.1 and p.3]: 'S.O.E. Ludlow'. Inscribed in pencil [p.4]: 'Overland'. 20-21 October 1841