242 



On tfie Mean Temperature of the 



Temperature of the Earth in Kisnekejewa (Lat. 54° SC, 



Long. 60°), an the east side of the Urals, 300 metres above 



the level of the sea. 



In the copper-mine of Kisnekejewa, a level, which opens on 



the declivity of the mountain, leads to a shaft twenty-five 



metres deep ; here the temperature of a collection oi' water was 



39°.87. This station has not been wrought for a long period. 



Temperature of' the Earth at BogoshwsTc (Lat. 60", Long. 60°), 

 height above the sea 200 metres. 



In the copper-mine of Turinski, east from Bogoslowsk, the 

 temperature of the mine-water, at tlie depth of 112 metres, is 

 43°.25. In the mine of Frolow, not far from the former, the 

 mine-water, at a depth of 65 metres, has a temperature of 

 39.°2; the water here filled the deepest part of the works, 

 shewing that tliey had been long unwrought. A spring, which 

 issues forth at a depth of oQ metres, shewed 38°.07. 



We may, by comparing the differences of the observed tem- 

 peratures with the differences of the dep'ths, deduce the law of 

 the increase of temperature as we descend, as is seen from the 

 following view : — 



As the amounts contained in the last column are more cor- 

 rect the greater the differences of depth, it is not correct to 

 take the mean from them : we would obtain a more exact value, 

 which yet docs not require more calculation (as the operation 

 from the theory of the least squares would demand), if we di- 

 vide the sum of the differences of depths by the sum of the dif- 

 ferences of temperature, we would thus obtain 2°.25 as the in- 

 crease of temperature for every 24.4 metres of descent. 



3 



