Polar clock, by W. H. Darker, Lambeth; London, mid

Made:
1845-1855 in Lambeth
maker:
William H Darker

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Polar clock, by W. H. Darker, Lambeth; London, mid 19th century. Wooden frame with glass semicircle inlaid with selenite that polarises sunlight according to time of day when viewed from the north.

Details

Category:
Optics
Object Number:
1918-117
Materials:
brass, copper (alloy), glass, mahogany, selenite and wood
Measurements:
overall (folded): 30 mm x 120 mm x 130 mm, ,
credit:
Court, Thomas Henry