Drilling machine with diamond bit powered by compressed air, invented by the French civil engineer Rudolph Leschot (active 1863) being used to bore the Mont Cenis (Rejus Rail) tunnel connecting France and Italy. Drilling began in August 1857 and the tunnel opened for rail traffic in September 1871. From The World of Wonders (London, c1896).
July 24th, 2016
Viewed 32 Times - Last Visitor from Mount Laurel, NJ on 03/19/2019 at 11:42 AM