
Jon Baddeley
Specialist Consultant Collectors, Science & Marine
Sold for £828.75 inc. premium
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The sunshine recorder was invented in 1853 by the scholar John Francis Campbell, before undergoing additional improvements in 1879 by the renowned physicist Sir George Stokes. The instrument focuses the sun's rays through the glass sphere to burn through the accompanying cards. By the end of the day, the condition of the card denotes the duration of sunshine. Negretti & Zambra was a London-based optical instruments firm operating from 1850 through to 1985.