On Underground Temperatures. Table III. 97 





y 



VI 



VII 



VIII. 



IX 



X 





Position and depth of 

 hole for thermometer. 



Temperature at 

 depth 



Rate of 

 increase of 







Coal (C). 



XvOCk \Sx) . 



Water (W). 



jjeptn. 



of coal, 

 rock, or 

 water. 



of air in 

 gallery. 



depth in feet 



for each 

 degree Fahr. 



Notes and remarks. 







. Feet. 



Fahr. 



Fahr. 



Feet. 







59 W 



60 „ 

 61 



? 

 ? 





63° 



65-5 



68-7 

 ? 

 ? 





ft 



65 



65 

 45 

 55 



* Temperature of water 

 collected at bottom of pit. 

 Prof. Lebour's later statement 

 relating to Virginian coal-pits 

 (a) seems more reliable. 



OTHER THAN COAL. 



rock or lode, are marked S, in Column V ; those in water collected 

 Accordingly as the springs (S) are known to issue from rock or lode 

 or station, from the shaft and the temperature of the air in the gallery 

 in the following tables is given in Column III. 



depths given in Column IV ; hut where the figures are in italics they 

 Column IV). It is only the difference of temperature between those 







V 



VI 



VII 



VIII 



IX 



X 





Number 



Position of 

 thermometer. 



Temperature at 

 depth 



Pate 

 of 

 increase 







in 

 general 



lisf, 

 Table I. 



Water (W^. 

 Spring (S). 

 Rock (R). 



Depth of 

 hole in 

 rock. 



Of the 

 rock or 

 water. 



Of air 



in 

 gallery. 



of 

 depth 

 for 

 each 

 degree 

 F. 



Notes and remarks. 









Feet. 



Fahr. 



Fahr. 



Feet. 







21 

 13 

 15 

 14 

 22© 



S 

 R 



53 

 J' 

 J> 



2 

 2 



82° 

 76 



79-5 



73 



64 



80° 



78 



45 



53 

 55 

 71 

 18 



* The Slate in this mine 

 extends to depths of 

 about 800 to 900 feet, 

 the deeper levels are in 

 Granite. This, the deep- 

 est of the Cornish mines, 

 has now (1884) reached 

 a depth of 2400 feet. 



VOL. XLI. 



J 



