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?] magnetometers, 'C4' and 'C25'. Columns for number of vibrations, time, difference, difference of 50 vibrations, bifilar, and torsion in an upper table, designated 'vibrations of C4'; columns for deflection, reading, mean and difference, bifilar and torsion in a lower table, designated 'deflections of C25'. Entries for 8-16 November headed 'Surat School'. 2 November-9 December 1846