Magnetic observations at the Trivandrum Magnetic Observatory, India, by John Caldecott Horizontal force observations made using bar no.2, at the Magnetic Observatory at Trivandrum [Thiruvananthapuram], Kerala. The table provides thirty readings, in groups of five, commencing at 11.22am. Columns for time, number of readings, values, means, value for 'r', position f deflecting bar, position of horizontal end, correction for change in deflection, corrected readings, and deflections. Headed [p.1]: 'Trivandrum Magnetic Observatory January 21st 1842' and 'copied from Miscellaneous Register'. Signed [p.2]: 'Jno. Caldecott'. 21 January 1842