Notebook of magnetic observations made at Colaba Observatory, Bombay [Mumbai], India, by [Arthur Bedford Orlebar?] Partly completed notebook, containing columns for number of vibrations, 1-300 on each page, with other columns left unused. Headed [p.1]: 'Intensity observations with Dipping Needle'. A pencilled table on the back of the notebook [p.20] is dated 15 October 1841. 1841