On Underground Temperatures. Table I. 77 





Y 



YI 



YII 





Depths 

 below 

 surface. 



Tempera- 

 ture at 

 depths. 



Refekences and Remakks. 



129 



Feet. 

 305 

 500 

 700 

 850 

 1000 

 1100 



Fahr. 



56° 1 

 6o 



62-8 

 ^5 



67-8 

 69 - 9 j 



- 



These are the results* of repeated observations 

 commenced in 1869, by Mr. Gr. J. Synions. 

 Rate of increase down to 910 ft. is 56 ft. for 

 1° F. Below that 49 ft. for each degree. 



130 



340 



390 

 440 



49*3 



Si"* 

 5i "3 J 





Water stands in shaft at 328 ft. No reliance is 

 placed on this determination. 



131 



857f 



65*7 



Water stands at 797 ft. 



132 



660 





Shaft full of water. 



133 



42 

 342 



46-5 " 

 46-6 . 





Water stands 24 ft. down shaft. Unreliable. 



134 



50 

 200 

 350 



47 1 



50 \ 



5 1 J 



No weight attached to this determination. 



135 



350 

 994 



5o | 

 50 J 



Same temperature at all depths. 



136 



1166a 



1466 

 1736 



66 " 

 72 



li\ - 



f 



a. 100 feet deep in bore-hole. 

 Brit. Assoc. Report of 1872. Shaft is 1066 feet deep, 

 ana oore-nole 000 teet. lotal aeptn 1924 reet. 



131 



328 



1312 

 2165 



59 '5 

 69 



76 j 



\ 



Brit Aq<*nr» Rpnnrt of 18*73 Tbp dinmpfpr r>f fliia 



bore-hole is 4 feet. Convection currents inter- 

 fere with these results. 



138 



100 



283 



53 ) 



54 J 



Original depth was 895 feet. Blocked. Uncertain 

 results. 



139 



621 

 1209 

 1652 

 1900 



5° - 7 " 

 58-3 



6l '2 



61 '4 J 



\ 



Brit. Assoc. Report of 1874. Observations made in 

 holes 2 feet deep and far from the workings. 

 Temperature of air not given. 



140 

 141 



761 



1017 

 1656 



" 1 

 78 



87 ^ 



> 



Temperature of air in gallery 77|° F. Obser- 

 vations made in holes 5 metres deep. Thermo- 

 meter left 24 hours. 



X The section of this mine shows fifteen shafts. Herr Grimm attributes 

 the slow increase of heat to the rocks, which are of Silurian age, being very 

 quartzose. 



