| Description | Graphs showing curves of the declination, horizontal force, and vertical force magnetometers at Madras [Chennai], using Gottingen mean time on selected days. These include term days, 27-28 August, [?] September, 20-21 October, 26-27 November, and 22-23 December. With an additional curves for 3 December and 15 December 'being a day of considerable irregularity' and for 30 December 'being a day of considerable disturbance'.
Each sheet is headed 'Term-day Curves for [month] 1841' and signed 'S.O.E. Ludlow Supt. Magl. Obsy. Madras'. |