| Description | Graphs showing curves of the declination, horizontal force, and vertical force magnetometers on days of 'considerable disturbance' at Madras [Chennai], using Gottingen mean time. The later two sheets also show curves for the thermometers associated with the horizontal and vertical force magnetometers.
Each sheet is signed 'S.O.E. Ludlow'. Inscribed [p.4]: 'Magnetic Observations Madras November - 1842'. |