On Underground Temperatures. Table I. 





y 



yi 





Depths 



Tempera- 





below 



ture at 





surface. 



depths. 





Feet. 



Fahr. 



Ill 



1049 



75° 1 







1184 



75 







1282 



78 









8o 









J 



"> 





112 



360 



6 1 







LAW 



65 







1400 



68 







1690 



75 





113 



865 



5& 







920 



63 







1673 



69 









67 





114 



371 



56 







Dot) 



59 j 





115 



250 



55 





988 



61 











116 



1100 



60 







1135 



68 







1270 



63 







1315 



69*5 







~t OCA 



66 







1395 



71 







1400 



7o'5 _ 





117 



lODO 



7*11 - 







1 ceo 





\ 





1938 



96 . 





118 



483 



64-5 1 





564 



66 





1674 



78 







1815 



80 j 





1890 



83 J 



yn 



Refebences and Remaee:s. 



Coal Commission Report 

 p. 104. Temp, in gallery. . 



71° 

 72 

 73 



.. 70 



Distance 



Ibid., p. 105, et seq. Tern- from shaft, 



perature of air in gallery. . 62° F. 27 yards. 



66 



1587 

 66 1877 

 74 2327 



Ibid., p. 123. Temperature of 

 air in gallery 



60 



70 

 71 



72 

 55 



58 



50° F 



69 



58| 



68 



62 



73 



72 



110 



570 

 2090 



1370 



Distance 

 from shaft. 



312 yards. 

 1935 „ 



955 „ 

 2980 „ 

 1640 „ 

 4332 „ 

 3550 „ 



Ibid., p. 123. 



Ibid., pp. 143 and 188. All the holes were 1 yard 

 deep and made air-tight. Holes allowed to stand 

 8 hours before thermometers were put in. 

 Thermometers left 30 minutes. 



further in the heart of the mountain, and the rise of surface at No. 4 is very abrupt. 



Temperatures taken 4 feet deep in coal, in dry holes and no gas. 



X Holes in coal 3 feet deep, filled with water, and left 48 hours. Thermometers 



then placed in them for 24 hours. 



§ The mean annual temperature of Durham is 47 "1°, and of Seaham is 47 '7.° 

 || These temperatures were taken after boring operations had been suspended 



about a week ; bore-holes full of water. 



