Magnetic curves made at Colaba Observatory, Bombay [Mumbai], India Graphical representations made from hourly observations at Colaba Observatory, usually twelve of more days per sheet. Tracks for declination, horizontal force, vertical force, bifilar and induction magnetometers. Each sheet is headed 'Magnetic Observatory Bombay', with the commencing date of observations. There is a rough pencil sketch on p.20. 1 January-31 December 1846