Diamond-tipped drilling machine. 1866 illustration of a man using a drilling machine with a diamond bit to bore the Mont Cenis (Frejus Rail) tunnel connecting France and Italy. This machine is powered by compressed air and was invented by the French civil engineer Rudolph Leschot (active 1863) being used. Drilling for this tunnel began in August 1857 and the tunnel opened for rail traffic in September 1871.
July 24th, 2016
Viewed 8 Times - Last Visitor from Fairfield, CT on 03/02/2019 at 7:12 PM