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LXXV. Note on the MeanTemjperature and Mean Barometric 

 Height of Jloulouk, in the Island of Ounalachka. By Pro- 

 fessor M. A. KuPFFER, of the Imperial Academy of Sciences 

 of St. Petersburgh*. 



l\/r LUTKE lias communicated to me some meteorolo- 

 -^ -■■ • gical observations which have been sent to him from 

 Ounalachka. Though these observations do not yet contain 

 a very great space of time, I have no doubt that the interest 

 which they possess will be received as an excuse for the hurry 

 in which I have published them. 



The following Tables contain the mean barometric heights, 

 expressed in English inches, and the indications of a thermo- 

 meter of Reaumur placed in the shade, and towards the north, 

 in a hollow cylinder of white iron, open at both ends. The 

 observations were made three times a day, about S*" a.m., 

 l*" P.M., and 9^ p.m. The duties of the service did not always 

 permit the observer to keep exactly to these hours; the ob- 

 servations were sometimes made half an hour .sooner or later: 

 but such is the slowness with which the temperature varies in 

 this climate, that this irregularity does not sensibly affect the 

 accuracy of the mean results. 



Table I. — Containing the Mean Temperature of each Month 

 of 182S, and part of the Years 1827 and 1829 [Old Style). 



or 39°-87.5 Fahr. 

 at Leith Firth in 



Mean of the first twelve months... 4°*0 



Mean of the year 1828 3 '5 



Mean of the last twelve months ... 3 '0 



General mean 3°-5 



According to the observations made 

 Scotland, and communicated by Sir D. Brewster, the mean 

 observation made at S*" a.a;., 1 '' p.m., and 9'' p m., will exceed 

 tlie true temperature of the place by 0°2 ol" Reaumur. 



Hence the corrected mean teniperature of Jloulouk will be 

 3°' 7 Reaumur, or 40°- 325 Fahrenheit. 



* Communicated by the Author. 



