| Description | Hourly meteorological observations taken from 6.00am on 21 March to 6.00am on 22 March 1840 [March equinox]. Columns for day of the week and day of the month, hour, barometer readings and difference, thermometer inside, thermometer in shade outside, Reaumur thermometer in Sun, hygrometer (thermometer, dew point and difference), extremes of heat and cold, rain gauge [column blank], wind direction and strength, and general weather remarks.
Headed [p.1]: 'Quarterly Meteorological Observations taken at the Observatory on the 21st & 22d March 1840'. Signed 'John Morton. In charge of the observatory'. Various minor inscriptions [p.2] including: 'Hourly Metl. Obsns. Mauritius March 1840'.
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