Barometric curves made from observations at Colaba Observatory, Bombay [Mumbai], India With a printed preface: 'The enclosed sheets contain Curves Projected from the hourly observations of the Barometer for Twelve Lunar months. The curves commence at the midnight next full moon, and are Projected on a scale of Thousands of an inch in Vertical to an hour in time in Horizontal measure. The Sheets are marked 1,2,3,4,5 and 6 Longitudinally and A,B,C,D, and E Vertically and ought to be in this manner pasted together. They form a roll whcih when extended measures 60 feet by 10. They are in their detached form unserviceable for reference: to make them catch the eye with greater distinctness the lines ought to be coloured'. 19th century