Peter William Barlow (1 February 1809 – 19 May 1885) was an English civil engineer particularly associated with railways bridges (he designed the first Lambeth Bridge a crossing of the River Thames in London) the design of tunnels and the development of tunnelling techniques. In 1864 he patented a design for a cylindrical tunnelling shield later developed further by his pupil James Greathead in the construction of a tunnel under the Thames.
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