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Cassegrain reflecting telescope of 6 inch aperture by Jesse Ramsden (~1762-1774).

Science Museum Group, CC BY-SA 4.0 via Cassegrain reflecting telescope, 1762-1774. 1913-281 Science Museum Group Collection Online. https://collection.sciencemuseumgroup.org.uk/objects/co56491/cassegrain-reflecting-telescope-1762-1774-telescope-cassegrain-telescope-reflecting-filar-micrometer

#telescope

Cassegrain reflecting telescope, 1762-1774 | Science Museum Group Collection

Cassegrain reflecting telescope of 6 inch aperture by Jesse Ramsden, London on an adjustable equatorial mounting with 2 spirit levels and 3 levelling screws.
collection.sciencemuseumgroup.org.uk
#telescope

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