Geological map of Cornwall and part of Devon, 1869.
© Science Museum / Science & Society Picture Library
Map showing the distribution of rocks such as granite and sandstone which have traditionally been used as building materials, and of copper, iron, lead and tin. Metals such as these were important in Britain's industrial development, and tin mining in Cornwall dates back over 2000 years. Illustration from 'Underground life, or, Mines and miners' by Louis Simonin (1830-1886), published in London in 1869.