Section of Thames Tunnel (1825-1843) showing men at work in shield (right) while others take away spoil. Picture also shows construction of arched masonry lining using Roman cement behind shield. Patent for this first tunnelling shield taken out by Marc Isambard Brunel 1818. Isambard Kingdom Brunel was site engineer. Tunnel still used by electric trains between Whitechapel and New Cross, London. Woodcut 1842.
July 1st, 2016
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