On Underground Temperatures. Table I. 79 





y 



VI 





YII 





Depths 

 below 

 surface. 



Tempera- 

 ture at 

 depths. 





Reeeeences and Remaeks. 



142 



Feet. 

 65 

 206 

 395 



Fahr. 



55 



58 J 





Brit. Assoc. Report of 1875. Water stands 60 feet 

 from surface. 5 feet shaft down to 200 feet, 

 then a bore-hole. 



143 



100 

 500 

 1000 

 1300 

 1500 

 1950 

 2000 



68 " 

 68f 



6 9i 



7o| 



73 



78 



79 





Brit. Assoc. Reports of 1875-6. Springs at 790 

 and 950 feet. Strong convection currents uffect 

 results. 



144 



100+ 

 700 

 1100 

 1500 

 1700 

 2100 

 3390 

 4052 



55 1 

 70-8 



79 '5 

 84. 'C 



87'5 

 96-3 



"5 "5 





Brit. Assoc. Report of 1876. Diameter of bore at 

 3390 feet, 12 inches ; then reduced to 6 inches. 

 Bore-hole plugged to protect against convection 

 currents, and observations correctedfor pressure. 



144a 



656 



54 





Water overflows. 



145 



126 



56* - 







146 

 141 

 148 



658 

 286 



DU/ 



286 

 472 



69 

 442 



67f 

 55 



03a 

 56 



7of 



84 J 



* 



Obs. made in holes - 6 to 0*7 m. deep in sides 

 of shaft during sinking. Little circulation of 

 air ; z hour elapsed between boring hole and 

 inserting thermometer. Temp, of air in the 

 wet shafts, 1, 2, and 3 was from 52 to 54° : in 

 the dry shaft, No. 4, 59°. 



149 



150 

 151 



1368 " 



830 



935 



715 

 1358 _ 



1365 

 1514 



10 



60 

 150 

 310 



- 



75 1 

 79 j 



81 "1 



8! 



8z'7 

 84-7 J 



I 



Brit. Assoc. Report of 1877. The actual tempera- 

 tures are not given ; only the rate of increase 

 which averages for the 5 mines 75^ ft. for each 

 1° Fahr. 



Still air in gallery 78£°. Trial holes 10 ft. deep ; 

 left four weeks to cool, temp, falling from 81 to 

 79°. Air travelled 3 miles and nearly stagnant. 



The bore-hole had been 20 months at rest. 

 Water stands to near top of tube. 



152 



855 



62 - 7 





Report of 1878. Hole in coal 4 ft. deep. 



|| The air current down the shaft amounted to between 20,000 to 30,000 cubic 

 feet per minute. Neither the temperature of the air in gallery, nor the distance 

 from the shaft are given. In the other parts of the mine, the air currents showed 

 differences of 2 to 3°, according to the season of the year. 



