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CASELLA SUNSHINE RECORDER

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CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER CASELLA SUNSHINE RECORDER

CASELLA SUNSHINE RECORDER

A Campbell–Stokes sunshine recorder by Casella of London. Circa 1937.

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.

Height: 18 cm

Width: 21 cm.

Depth: 22.5 cm.