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Instruments of Science & Technology / A NEGRETTI & ZAMBRA CAMPBELL STOKES SUNSHINE RECORDER, MK 3, ENGLISH, LATE 19TH CENTURY,

Lot 45
A NEGRETTI & ZAMBRA CAMPBELL STOKES SUNSHINE RECORDER, MK 3,
ENGLISH, LATE 19TH CENTURY,
28 September 2022, 14:00 BST
London, Knightsbridge

Sold for £828.75 inc. premium

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A NEGRETTI & ZAMBRA CAMPBELL STOKES SUNSHINE RECORDER, MK 3, ENGLISH, LATE 19TH CENTURY,

engraved LAT 45' -65', the glass sphere pivoted in brass arc and mounted on tripod base with levelling screws, together with a collection of recording cards,
9 1/2in (24cm) high

Footnotes

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.

Additional information