Notebook of magnetic intensity observations made at Colaba Observatory, Bombay [Mumbai], India, by [Arthur Bedford Orlebar] Daily readings of vibrations and deflections using a [bar?] magnetometer, designated 'A51', with various weights. Columns for number of vibrations, time, difference, difference of 50 vibrations, bifilar, and torsion in an upper table, designated 'vibrations'; columns for deflection, reading, mean and difference, bifilar and torsion in a lower table, designated 'deflections'. The notes are paper bound. Each sheet is headed 'Observations for Intensity. 6-31 December 1845