John Flamsteed’s 90ft. focal length Object-glass

Made:
1650-1677 in France
maker:
Pierre Borel

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Science Museum Group
© The Board of Trustees of the Science Museum

Object-glass of 90ft. focal length which belonged to Flamsteed. Presented to the R.S. by James Hodgson, F.R.S., in 1737. R.S. no.25, no case. Diameter varies from about 9 3/4"to 9 7/8". Chipped at edge and badly scratched on one face 5/16" thick. Thought to be the object glass from Flamsteed's well telescope.

Details

Category:
Astronomy
Object Number:
1932-460
type:
objective lenses
credit:
The Royal Society