Augsburg equinoctial sundial, German, c 1800.
© Science Museum / Science & Society Picture Library
Universal equinoctial sundial of the Augsburg type, signed on the base, Johan Schrettegger in Augsburg. Sundials were accurate enough timekeepers for most people in the 18th century. They varied in size and type, from large dials on the sides of churches to small, intricate dials.