Magnetic and temperature observations at the Madras Magnetic Observatory, India, by Samuel Owen Edgar Ludlow Table of hourly observations of a bifilar magnetometer (uncorrected) measuring horizontal force, commencing at noon of each day (Gottingen mean time); including sums, means, temperature corrections and corrected means. With comparable hourly observations of the thermometer of the bifilar magnetometer, with sums and means. 1-30 November 1842