On Underground Temperatures. 



Table II. 



91 





v yi 



Position and 

 depth of hole 

 for thermometer. 



yii yiii 



Temperature at 

 depth 



IX 



Rate of 

 increase of 

 depth in feet 



for eaeh 

 degree Fahr. 



X 



Notes and remarks. 



Coal (C). 

 Rock (R). 

 Water (W.) 



Depth. 



of coal, 

 rock, or 

 water. 



of air in 

 gallery. 





116 C 



>> 



j> 



136 R 



>> 

 »i 



>> 



121 W 

 111 R 



126 R 



104 R§ 



>j 



122 R 



» 



159 ,', 



>> 



Feet. 



3 

 jj 

 »> 



>j 

 100a 

 400 

 670 



3 



j? 



3 to 4 



j> 



3 



» 



4 

 u 



Fahr. 



63° 



69-5 



66 



71 



70 -5 



66 

 72 

 77 



(7-1) 



82 



80 

 66 



78 



94 



(9-0) 

 (7-0) 

 (16-0) 



77 

 86 



{9-0) 



78 



82 



74 

 81 



Fahr. 



58-5° 



68 



62 



73 



72 



62? 

 70 



64 



67 



65 

 71? 



71 '5 

 79 -0 



Feet. 



79 

 59 

 72 

 58 

 60 



60 

 59 

 58 



52 

 52 



53 



46 



56 

 53 



40 

 58 

 58 



68 



59 

 30 



70 



63 



74 

 73 



* The temperature observa- 

 tions in this pit were made in 

 a bore-hole (a) drilled at the 

 bottom of the shaft, which is 

 1066 feet deep. The first 

 series of observations were 

 made by Mr. Atkinson in 

 April, 1869 (Coal Commission 

 Report, vol. ii, pp. 128 and 

 133), after the boring opera- 

 tions had only ceased twenty 

 minutes. The temperature at 

 the bottom of the bore-hole, 

 then 858 feet deep, or 1924 

 below the surface, was 96°. 

 The experiments were re- 

 peated after the boring opera- 

 tions had been suspended 

 about a week, and the tem- 

 perature found to be the same 

 as before. But those made 

 three years later (April, 1872) , 

 and recorded in the British 

 Association Reports, show a 

 considerable decrease of tem- 

 perature. The abandoned 

 bore-hole had then silted 

 up to the depth of 644 feet. 

 The encased, thermometer 

 was pushed down to 26 feet 

 in this, or to a depth of 1736 

 feet from surface, where the 

 temperature was found to be 

 771°. 



f The observations were 

 made in holes at bottom of 

 shaft during sinking. 



% The distances in Column 

 IV are from the down-brow. 



§ The temperature of the 

 rocks in this pit was from 2° 

 to 4° higher than that of the 

 coals. 



|| 1 he first series of observa- 

 tions at Dukinfield, although 

 taken with great care, are 

 wanting in details. We 

 neither know the tempera- 



