John Rennie the Elder (1761–1821), engineer (factories, canals, design of London Bridge)
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Sir John Rennie the Younger (1794–1874), engineer (rail lines, completion of London Bridge)
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In the 1920s he campaigned, unsuccessfully, for the preservation of John Rennie's Waterloo Bridge.
In 1791, John Longbotham, Robert Dickinson and Richard Beck resurveyed the proposed line, and a final survey was carried out later the same year by John Rennie.
The principal designers were the architects and engineers Daniel Asher Alexander and John Rennie.
Two reports were produced, one by George Maxwell, and the second by Edward Hare, who had been assisted by William Jessop and John Rennie.
He estimated the cost at £2,000, which had been raised by May 1792, but by this time, the engineer John Rennie had produced proper plans for a ship canal, estimated to cost £3,084, including the construction of a sea lock.
London to Portsmouth Ship Canal – 1825 – took levels for the combined scheme of John Rennie, James Elmes and N W Cundy.
In 1810 the bridge was again declared to be "in decay" and dangerous, and local magistrates commissioned engineer John Rennie, the architect of Waterloo Bridge in London, to design a new bridge.