Magnetic and meteorological observations at the Trivandrum Magnetic Observatory, India, by John Caldecott Hourly observations made at Trivandrum [Thiruvananthapuram], Kerala, of the declination, horizontal force, and vertical force magnetometers, commencing from 10.00p.m. on 21 October [Gottingen Mean Time] and continuing to 9.00p.m. on 22 October 1841. With readings of the barometer and attached thermometer, dry and wet bulb thermometer, and calculated dew point and tension of vapour [in the printed column for electrometer readings] over the same period. There are general remarks on the state of the weather. Headed 'Abstract of Term-day Observations'. Inscribed [p.4]: 'Trivandrum October 1841'. 21-22 October 1841