Mr Foggo on the Results of a Journal, tyc. 249 



Art. XII. — Results of a Meteorological Journal kept at Se- 

 ringapatam during the years 1814 and 1816. By Mr 

 John Foggo Junior.* 



Ihesk journals contain a register of the thermometer at sun- 

 rise, and in the afternoon, of the thermometer within doors, 

 and of the temperature of the river Caveri, taken at 6 a.m. 

 and 3 p.m. These are followed by a column for the height 

 of the river, and another for the evaporameter. In the year 

 1816, the barometer was added to the register, and observa- 

 tions made regularly three times a-day, namely, at 4 a.m., 10 

 a.m., and 4 p.m., and in the last three months it was also ob- 

 served at 8 p.m. The amount of rain was also measured dur- 

 ing this year, and in both the state of the weather was care- 

 fully noted. 



Mean Results for both Years. 



The mean temperature of the whole year is, by observa- 

 tion, 77.06 ; by Dr Brewster's formula 76.92, without correc- 

 tion for elevation. From the register of the barometer kept 

 in 1816, it appears that this city is elevated 2412 feet above 

 the sea. As in the tropics an elevation of 613 feet depresses 

 the temperature 1.8 Fahr. for moderate heights, we have 

 for the mean temperature of the coast intermediate between 

 Madras and Pondicherry, 84.14. Now, in the year 1823, 

 the mean temperature of Madras was 83.53, and the tempera- 

 ture of Pondicherry, according to the old observations of Le 

 Gentil, 85. By Mr Atkinson's formula for depression of 

 temperature according to the altitude, the temperature of the 

 coast is 82.4. The mean temperature of these places appears to 

 vary considerably from year to year, as we find that Dr Rox- 

 burgh's observations give the temperature of Madras no higher 

 than 80.42. The mean temperature at Scringapatam at sunrise 

 is 63.17, at 3 p.m. 90. 95, and the mean temperature of the day 

 is 84°, of the night 70.11 ; the average daily range of tempera- 



* The very valuable Registers, of which the following is an abstract, 

 were kept by Mr Scannan. The editor owes them to the kindness of Hen- 

 ry Harvey, Esq. 



