The Thames Barrier is a huge mechanical Dam which can completely close the River Thames at times of high risk of flooding. It was conceived following the devastating floods of 1953, and although it has been operational since 1982 it is still an impressive sight and popular with tourists.
Wilson examined it closely through the coin-op telescope, and told me that he could see a number of ways in which the Barrier might be improved.
'I shall write to the Chief Engineer as soon as we get home!' he said.
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