Notebook of actinometer observations made at Colaba Observatory, Bombay [Mumbai], India, by [Arthur Bedford Orlebar?] Observations of solar radiation at the Bombay Observatory, in groups of five readings over a two-day period. Beginning at 6.57a.m and ending at 6.17p.m. on 7 April; and beginning at 6.56a.m and ending at 5.04p.m. on 8 April. Columns for date, beginning, end, sun or shade, 'A', 'B', 'B-A', radiation and mean radiation. The notes are bound within a paper cover, made from a copy of 'The Commercial Advertiser' of Bombay, no.217, for Friday 21 January 1842. 7 April-8 April 1842