May 1963, London, England, UK --- Secretary Pauline Edwards demonstrates the use of closed-circuit television for self-assessment, London, 1963. --- Image by © Hulton-Deutsch Collection/CORBIS

May 1963, London, England, UK — Secretary Pauline Edwards demonstrates the use of closed-circuit television for self-assessment, London, 1963. — Image by © Hulton-Deutsch Collection/CORBIS