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Campbell–Stokes sphere

£2250
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Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere Campbell–Stokes sphere

Campbell–Stokes sphere

£2250
A CAMPBELL–STOKES SUNSHINE RECORDER BY CASELLA OF LONDON. CIRCA 1968.
 
Marked with the Casella logo. Numbered: 8977.
 
The Campbell–Stokes sphere is used to record sunshine.
 
Height: 23 cm.
Width: 19.5 cm.
Depth: 20 cm.
 
On a later hardwood display board. 23 cm x 23 cm.
 
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.