On Underground Temperatures. Table I. 



81 





y 



VI 



VII 





Depths 

 below 

 surface. 



Tempera 

 tare at 

 depths. 





References and Remabks. 



153 



Feet. 



226 

 1004 

 1302 



Fahr. 

 52° 



59 . 



\ 



Bore-hole at top 24 in. in diameter. No correc- 

 tion for convection currents. Springs met with . 

 at depths of 318, 800, and 1303 ft. 



154 



3100 

 4101 



79 "9 1 

 8 3 -8 j 





Reports of 1878-9. Swiss end of tunnel. 





4615 

 4965 

 4108 



8^-8 " 

 83-7 

 8 5 * . 





Italian end of tunnel. 



155 

 15G 



441 

 1367 

 1769 



1232 

 1439 

 1769 



54'7 1 



68 -5 



74*7 



66'7 



69 -7 

 74 "7 J 



> 



" Brit. Assoc. Report," 1879. 



Ventilation slight, and care taken to avoid air- 

 currents. Trial holes 2 ft. deep, plugged, and 

 thermometer left twelve hours. 



15S 



465 



555 

 636 

 660 

 1041 



53'4 



5 2 "9 

 58-8 



54 

 60 -8 



Report or 1880. — Obs., distant from shaft 570 ft. 

 Holes 2 feet deep. 



>> )5 j? 321 ,, 

 „ 2522 „ 

 » „ „ 360 „ 

 • » » „ 570 „ 



159 



1987 

 2407 

 2416 

 2700 



74 



80 

 81 



86-5 



Distance from air shaft, 1380 ft. ; air 71^°. 



1890 • 78^ 

 „ 1800 „ ; „ 79. 

 480 „ ; „ 75^. 



16<) 



660 



62 



Report of 1881. 1200 ft. from shaft. Air still. 



161 



2790 



85-3X 



Hole 3| ft. deep. 



162 



1020 

 1050 



62-3 } 



The temperature of air in the galleries in these 

 and preceding pit are not given. 



163 

 164 



560 



810 

 1000 



61 -7 - 



63 



63 J 



> 



In holes 2 ft. deep. Distance from shaft and 

 temp, of galleries not given. A moderate cur- 

 rent of air was passing. 



165 





69 -7 



±>rit. Assoc. Jtveport, ±000. 



165a 



760 



72*5 



Holes 3 ft. deep filled with water. 



166 



495 





De Lapparent's, " Greologie," 1881, p. 372. 



161 



1012 





Ibid. The rate of increase only given. 



holes 4 feet deep, and thermometer left 48 hours. The pit was entirely free from 

 water. 



X The gallery was free from any strong air- current and the ground newly opened. 

 YOL. XLI. G 



