This illustration, titled 'Visit of the devil to the old man', comes from a humorous pamphlet 'A New Discourse of a Stale Subject, called the Metamorphosis of Ajax' written by the writer John Harington, or Harrington, a godson of Queen Elisabeth I. 'Ajax' was code for 'jakes' - Elizabethan slang for privy. Harington was using the water closet as a metaphor in this pamphlet, to attack the elements of hypocrisy that he saw in society. The book contains extensive literary allusions and double meanings. The water closet shown was a wash-down system with a valve in the bottom of the water closet - both still elements of the modern flush toilet.
© Science Museum / Science & Society Picture Library