Magnetic observations of vertical force made at Colaba Observatory, Bombay [Mumbai], India Hourly observations of the vertical force magnetometer at the Colaba Observatory, arranged by day. Columns for Bombay mean time, Gottingen mean time, observed reading, correction, correct reading, untitled [a+a/2], 'G', thermometer, observer's initial and general remarks. The front cover [p.1] is headed; 'Vertical Force February 1842' and has a table of 'Corrections to be added'. 1-26 February 1842