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Campbell–Stokes recorder used in a tropical region. A Campbell–Stokes recorder adapted for use in polar regions (The right sphere is facing south) The Campbell–Stokes recorder (sometimes called a Stokes sphere) is a type of sunshine recorder. It was invented by John Francis Campbell in 1853 and modified in 1879 by Sir George Gabriel Stokes.
A Campbell–Stokes sunshine recorder. A sunshine recorder is a device that records the amount of sunshine at a given location or region at any time. The results provide information about the weather and climate as well as the temperature of a geographical area.
For the specific purpose of sunshine duration recording, Campbell–Stokes recorders are used, which use a spherical glass lens to focus the sun rays on a specially designed tape. When the intensity exceeds a predetermined threshold, the tape burns.
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A Jordan sunshine recorder (left). The other instrument is a Marvin 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.
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1 The unit is set in a stand facing south to enable the maximum amount of sun to be recorded