Thousands of tourists pass through London’s Soho every day. Few glance at this Broadwick Street water pump. Yet it tells the amazing story of how Dr John Snow solved the mystery of why thousands of Londoners were dying of cholera in Victorian London.
Snow rejected the accepted view that cholera was spread by polluted air. That view was disastrously influencing government policy. In the 1848/49 cholera epidemic, poor law commissioner Edwin Chadwick ordered that sewers be flushed into the Thames to clean the air in poor areas. Yet large areas of London took drinking water from the river – so Chadwick’s policy condemned thousands to death by cholera.