Shield used during digging of Thames Tunnel (1825-1843) which allowed 12 men to excavate simultaneously. Patent for this first tunnelling shield taken out by Marc Isambart Brunel in 1818. Woodcut, 1842

- Image ID: D966BR
Shield used during digging of Thames Tunnel (1825-1843) which allowed 12 men to excavate simultaneously. Patent Stock Photo
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Shield used during digging of Thames Tunnel (1825-1843) which allowed 12 men to excavate simultaneously. Patent for this first tunnelling shield taken out by Marc Isambart Brunel in 1818. Woodcut, 1842
World History Archive / Alamy Stock Photo
Image ID: D966BR
Shield used during digging of Thames Tunnel (1825-1843) which allowed 12 men to excavate simultaneously. Patent for this first tunnelling shield taken out by Marc Isambart Brunel in 1818. Woodcut, 1842