Drilling machine with diamond bit

Drilling machine with diamond bit

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Credit: Universal History Archive/UIG/SCIENCE PHOTO LIBRARY

Caption: 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).

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