Some Tunnelling Feats 67 



when they entered the heading, and got 

 into the heart of the mountain the heat 

 was extremely trying. What with these 

 alternating spells of intense cold and great 

 heat the death-roll was rather heavy, and 

 sickness made constant vacancies in the 

 gangs. 



As usual, the tunnel was driven from 

 either side, and there came a day when 

 the engineers broke through and clasped 

 hands. 



