On Underground Temperatures. Table III. 



105 





V 



VI 



YII 



YIII 



IX 



X 



Number 



Position of 

 thermometer. 



Temperature at 

 depth 



Rate 

 of 

 increase 





in 

 general 



list, 

 Table I. 



Water (W). 

 Spring (S). 

 Rock (R.) 



Depth of 

 hole in 

 rock. 



Of the 

 rock or 

 water. 



Of air 



in 

 gallery. 



or 

 depth 



for 

 each 

 degree 



F. 



Notes and remarks. 







Feet. 



Fahr. 



Fahr. 



Feet. 





8 



10 



13 



W 



j> 

 )> 

 )> 

 R 



» 

 j > 



•• 



58° 

 57-2 

 62 * 5 

 61 



48-2 



59 



66 



(7) 



59° 



72 



50 

 58 



55 

 40 

 55 

 54 

 51 



* The gneiss of this 

 district alternates with 

 mica-schists, and is tra- 

 versed in many places 

 by masses and d}kes of 

 granite. 





R 

 j> 





54-5 

 60 



(5-5) 





63 

 58 



48 





139 



R 



2 



50-7 

 58-3 

 61-4 

 (7-6) 



(10-7) 





126 



72 



120 



f The workings com- 

 municate with a great 

 drainage tunnel 1360 feet 

 above the sea-level. 



149 



R 



H to 2| 







74 



X These rocks are tra- 

 versed by veins of rhyo- 

 lite. 



3 







98 





45 





4 



R 



j> 

 >> 



2 



63 



64-8 

 67 



(11-5) 

 74-5 



66 

 65 



76 '5 



KK 

 OO 



150 

 90 



40 



§ Total depth of mine 

 1500 feet. 



1*0 



WorS 





69 -2 





110 





111 







67-9 

 81 





105 





165a 



R 



3 



72-5 









