On Underground Temperatures. 



Table II. 



95 



y vi 



Position and 

 depth of hole 

 for thermometer. 



Coal (C). 

 Rock (R). 

 Water (W). 



Depth. 



YII 



Till 



Temperature at 

 depth 



of coal, 

 rock, or 

 water. 



of air in 

 gallery. 



IX 



Rate of 

 increase of 

 depth in feet 



for each 

 degree Fahr. 



Notes and remarks. 



113' C 



i> 

 >> 



114 R 



it 



115 C 



»> 



152 „ 

 22 R 

 226 „ 

 221 „ 

 228 „ 



140 R 



141 „ 



214 R 



»> 



215 „ 



»> 



R 



216 „ 



145 R 



24 C 



25 „ 

 23 „ 



Feet. 

 4 



Fahr. Fahr 



16 



3i 



60° 

 62 

 61 



56 

 59 



55 

 61 



62-7 



42 



73 



57-5 



77 

 78 



87 

 (10) 

 (9) 



66 

 69 



76 

 81 

 (5) 

 81 



79-7 

 82 



(2-2) 



56 -5 

 67-7 



61 

 72 

 67 



59° 



65 



55 

 58 



63 



78 

 77 



77 '5 



54 



(11-2) 

 70 

 73 



74-3 



Feet. 



80 

 83 

 42 



61 



45 



36 

 78 



62 



45 



47 



51 



70 



30 

 40 



46 



90 

 70 



45 

 56 



48 

 49 

 52 

 45 



53 

 54 



58 



21 

 39 



47 



36 

 33 

 53 



* In this pit the working 

 proceeds from a hill towards a 

 valley. 



f These are the distances of 

 the stations under the sea. 

 The sea there being about 12 

 fathoms deep. Taking the 

 temperature of the sea at 48°, 

 or deducting 72 feet, Professor 

 Everett makes the thermo- 

 metric gradients 45° and 47°, 

 which is probably the more 

 correct. 



X The dip of the coal in 

 these pits is considerable. In 

 the " Brit. Assoc. Reports," 

 the temperature of the ground 

 at a depth of 5 metres, is esti- 

 mated at 54° F. The gradient 

 here given is, however, cal- 

 culated on a mean surface 

 temp, of 51°. 



§ The dip here is also con- 

 siderable, and the Coal-mea- 

 sures are overlaid by a thick 

 mass (300 to 400 feet) of 

 water-bearing Lower Cre- 

 taceous strata. 



|| Observations were made 

 during sinking, in holes in- 

 serted horizontally in side of 

 shaft. 



Strata nearly horizontal 

 — pit dry. 



** The strata here dip 25° 

 S.W., and overlie crystalline 

 rocks. 



ft A new and dry pit ; slow 

 ventilation. The water of a 

 well immediately above this 

 pit, 38 feet deep, had a temp, 

 of 55-5° F. 



