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Campbell–Stokes sunshine recorder

£1800
Campbell–Stokes sunshine recorder

Campbell–Stokes sunshine recorder

£1800

Place of Origin England

Date of Manufacture Circa 1925

Dimensions H 21.0cm  |  8.3in

A Campbell–Stokes sunshine recorder by Casella of London.

The Campbell–Stokes recorder (sometimes called a Stokes sphere) is a kind of sunshine recorder. It was invented by John Francis Campbell in 1853 and modified in 1879 by Sir George Gabriel Stokes. The original design by Campbell consisted of a glass sphere set into a wooden bowl with the sun burning a trace on the bowl. Stokes's refinement was to make the housing out of metal and to have a card holder set behind the sphere.

The unit is designed to record the hours of bright sunshine which will burn a hole through the card.

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