Jordan sunshine recorder

A Jordan sunshine recorder is a type of sunshine recorder invented in the 19th century by T. B. Jordan with later modifications by his son, J. B. Jordan.^[1] The device consists of a cylinder with two small apertures through which sunlight can pass. Two sheets of photosensitive paper are placed inside the cylinder and the recorder is positioned in such a way that the sunlight falling through the apertures leaves a path on the paper as the sun moves through the sky during the day.^[2] The Jordan recorder was criticized as producing less consistent results than the Campbell–Stokes recorder due to difficulty in precisely interpreting the sun paths recorded.^[3]