'7b Earl of Minto's Barometrical Measurement 



Geneva, which gave the following observations. Its division 

 is also in English inches and decimals. 



B. A. D. 



p. M. Inch. 



,8 30 Edge of the crater from whence the 



lava flowed in the eruption 1822, 26.424 16:2 8^5 

 Summit of the new cone formed by 



that eruption, .;!,;.,- 26.290 19.5 8.5 



4 Four feet below the old Palo summit, 26.476 17. 8. 

 4 10 Four feet below the old Palo summit, 26.440 9. 8. 



N. B. This barometer of Gourdon's requires that a correc- 

 tion of y^y should be added to the differences, or to the re- 

 sults calculated, the capacity of the tube being to that of the 

 cistern as 1 to 53. 



B — barometer in English inches and decimals. 

 A = temperature of mercury, centigrade. 

 D = temperature of air, centigrade. 



Daniel's hygrometer observed at Naples at 10 h. 30 m. a. m. 

 gave temperature of air = 58° Fahrenheit. Dew-point = 38° 

 Fahrenheit. 



17^/i March 1822 continued. 

 Adie's Sympiezometer observed at Naples. 



h. m. h. m. h. m. h. m. h. m. 



At 10 A.M. 11 20a.m. 1 20p.m. 6 5p.m. 10 p.m. 

 30.73 30.70 30.66 30.68 30.66. 



I'Jth March. 

 Temperature of the air at Naples at 1 h. 20 m. p. m. = 17*^.7 

 centigrade. 



\^th April 1822. 



Hour. 



h. m. B. A. D. 



A.M. ''^^^ ^^' • 4TJ*h. 



7 25 Naples, at my house, tWenty-one 



feet above the sea, - 30.200 17°.7 



8 30 Naples, do. do. 30.202 18 .8 17°. 

 10 40 Portici, three feet above the sea, 30.246 24 .5 17 .8 

 10 50 Portici, do. do. 30.238 21 .6 17 .8 



p. M. 



1 2 45 Hermitage of St Salvadore on Ve- 

 suvius, - 28 173 IB 6 17.3 



