Discoveries and inventions of the nineteenth century (1905)
Routledge, Robert · London : G. Routledge and Sons · leaf 423
bytorrents of water gushing from the soil, many of these being of greatvolume and force ; in fact, the work was here carried on for nearly awhole year in the midst of water—for the ground for the first mile con-sisted of glacial and other deposits, which were intersected by subter-ranean… … THE NORTH MOUTH OF THE GREAT TUNNEL, ST. GOTHARD RAILWAY. ROCK BORING. 375 quartz, which had the effectof quickly blunting the pointsof even the best temperedtools. But another kind ofdifficulty had to be overcomewhen the workings got be-neath the vale of Urseren.Here, at several places, layersof…
Inventions
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