Meteorological Journal, Kept by the Assistant Secretary, at the Apartments of the Royal Society, by Order of the President and Council

METEOROLOGICAL JOURNAL, KEPT BY THE ASSISTANT SECRETARY, AT THE APARTMENTS OF THE ROYAL SOCIETY, BY ORDER OF THE PRESIDENT AND COUNCIL. OBSERVANDA. Height of the Cistern of the Barometer above the plinth at Waterloo Bridge...83 feet 2 inches. above the mean level of the sea .........................97 feet. Height of the receiver of the Rain Gauge above the court of Somerset House ..79 feet. The External Thermometer is 2 feet higher than the Barometer Cistern. The Thermometers are graduated to Fahrenheit's scale. The Barometer is divided into inches and tenths. The Hours of Observation are of Mean Time, the day beginning at Midnight. The daily observations of the Barometer are not corrected. The monthly means are corrected for capillarity and temperature by the Table contained in Mr. Baily's paper in Phil. Trans. for 1837. ## Meteorological Journal for July and August, 1839 ### Barometer Corrections | Time | A.M. Barometer Uncorrected | P.M. Barometer Uncorrected | A.M. Altitude | P.M. Altitude | External Thermometers | |--------|-----------------------------|----------------------------|---------------|--------------|----------------------| | | | | | | | | 9 o'clock, A.M. | | | | | | | 3 o'clock, P.M. | | | | | | ### Temperature Data | Time | Fahrenheit | Self-registering | |--------|------------|------------------| | | | | ### Additional Information - **Mean Barometer Corrected**: [F 29.959] [C 29.919] - **Mean Temperature**: [F 68.6] [C 19.68] - **Remarks**: Various weather conditions noted throughout the days. ### Locations - **M**: Flint Glass - **T**: Crown Glass - **W**: Flint Glass - **S**: Crown Glass --- This table provides detailed meteorological data including barometric pressure corrections, altitude readings, external thermometers, and temperature data across various locations marked with different glass types. Additional remarks describe the weather conditions observed during each period. The observations for the month of September were not taken by the Assistant Secretary, on account of absence. ## Meteorological Journal for November and December, 1839 ### Remarks - **F** Overcast—high wind throughout the day, as also the evening. - **S** Overcast—light rain—brick wind throughout the day. Ev. The like. - **NE** (A.M.) Light fog and wind—deposition. P.M. Overcast—lt. wind. - **W** (A.M.) Overcast—light wind. P.M. Fine—light clouds. Evening, Overcast—light rain. - **SE** (A.M.) Light overcast—light rain and wind. P.M. Fine—light wind. Evening, Overcast—fine rain. - **E** (A.M.) Thick fog—light haze. Ev. Overcast—fine rain. - **NW** Overcast—lt. rain and wind throughout the day, as also the evening. (Overcast—light wind, with occasional rain throughout the day.) - **SW** (A.M.) Fine cloud and wind. P.M. Overcast—light wind. Evening, Very light rain. - **S** Overcast—very light rain and wind throughout the day. Ev. The like. - **N** Fine—light clouds and wind throughout the day. Ev. Overcast. - **NNW** (A.M.) Light fog and wind. P.M. Overcast—lt. wind. Ev. Light fog. - **SSE** (A.M.) Fine—light clouds and wind. P.M. Overcast—light rain. - **SE** Overcast—light fog throughout the day. Evening, Light rain. - **SW** (A.M.) Light fog and wind. P.M. Fine—light clouds. Ev. Cloudy. - **S** Overcast, with occasional rain throughout the day. Ev. The like. (Occasional fine rain throughout the day.) - **SSW** Fine—lt. clouds & wind throughout the day. Ev. Overcast—lt. rain. - **W** Evening, Fine and clear. - **NW** (Overcast—brick wind, with occasional rain throughout the day.) - **SW** (A.M.) Fine—light clouds and wind. P.M. Cloudy. Ev. Fine & clear. - **S** (A.M.) Light fog & wind. P.M. Fine—lt. clouds & wind. Ev. Cloudy. - **SSW** Overcast—brick wind with occasional rain throughout the day. Evening, The like. - **S** Overcast—very fine rain throughout the day. Evening, The like. - **E** Fine and clear—Frost during the night. - **NW** (A.M.) Thick fog. P.M. Overcast—light rain and snow. Evening, Overcast—light rain. - **SW** (A.M.) Overcast—light rain and wind—heavy rain throughout the day. Ev. The like. - **S** Overcast—light rain—brick wind throughout the day. Ev. The like. - **SSW** Fine—nearly cloudy—light wind throughout the day. Evening, Ev. Overcast—very light rain. ### Mean Barometer corrected | Time | Barometer | |------|-----------| | 9 A.M. | 29.656 | | 3 P.M. | 29.659 | *An unusual quantity during the twenty-four hours.* The quantity of rain has been unusually great for the year 1839 compared with those for 1837 and 1838: - In Paris: 17.942 inches - In London: 19.587 inches - In Berlin: 24.504 inches