On Underground Temperatures. Table IT. 93 



v yi 



Position and 

 depth of hole 

 for thermometer, 



Coal (C). 

 Rock (R). 

 Water (W). 



159 R 



161 R 



218 „ 



162 „ 



119 „ 



120 C 



105 „ 



106 „ 

 10*J „ 

 IOS „ 

 109 „ 

 155 R 



229 .. 



156 R, C 



163 R 



164 C 



HO „ 



112 C,R 



C 

 C,R 



131 C 



Depth. 



Feet. 



4 



3i 



2? 



VII 



Till 



Temperature at 

 depth 



of coal, 

 rock, or 

 water. 



Fahr. 



86-5° 

 (12 '5) 



85 '3 



84 



62 



62-3 



65 



78 



70 



73J 



71 



62 -5J 

 66 



54-7 

 68-5 

 74-7 

 (6-2) 



66 



66-7 

 69 -7 

 (5-0) 



61-7° 

 63 

 jj 

 60 

 70-5 

 73 

 78 

 (13) 



61 



65 

 68 

 75 

 (8) 

 58 

 63 

 67 

 69 



of air in 

 gallery. 



IX 



Rate of 

 increase of 

 depth in feet 



for each 

 degree Fahr. 



Fahr. 



75 -5 C 



63 

 75 

 68-5 

 67 



72-5? 



58° 



58-5 



71 



62 

 65 

 66 

 74 



60 

 70 

 72 

 71 



Feet. 



70 



51 



74 



80 



78 



78 



63 



50 



60 



59 



55 



72 



61 



83 

 77 

 71 



77 



73 

 74 

 69 



48 



62 

 67 



91 

 70 

 68 

 61 



59 



30 

 58 

 60 

 54 

 60 



80 

 61 

 80 

 74 



Notes and remarks. 



ture of the air in the shaft nor 

 the depth and position of 

 the holes. Nevertheless, the 

 later observations here given 

 show also low temperatures. 

 Mr. Dickinson, however, calls 

 attention to the fact that 

 before the shaft was sunk two 

 of the principal seams of coal 

 in the upper part had been 

 worked away from the out- 

 crop down towards the Astley 

 shaft, and in one case a tunnel 

 had been driven to where the 

 shaft had come. 



* This pit has now (1884) 

 been carried to the great depth 

 of 3150 feet. 



f These were all new pits. 



% Hole at bottom of shaft. 



§ Yery wet pit. 



|| An old pit. 



% The strata dip about 1 

 in 6. 



**Dip small. The Coal- 

 measures in this district are 

 covered unconf ormably by 100 

 to 200 feet of Jurassic and 

 Triassic strata. 



ft The dip is small in these 

 Aberdare pits. 



XX The depths in these pits 

 are not the depths of the shaft, 

 but are, in each pit, taken on 

 one and the same level, and the 

 depths given are those beneath 

 the surface, the differences of 

 depth being caused by the coal 

 seam passing from the valley 

 in which the shaft is situated 

 under an adjacent hill. 



i 



