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F3378

Newtonian secondary mirror Long Caption: An elliptical plane mirror made as a secondary mirror for a Newtonian reflector telescope. The diameter of the minor axis of this mirror is 29.21mm. Credit line: © National Maritime Museum, Greenwich, London, Herschel Collection Object: AST0818 Artist: Sir William Herschel Date: circa 1800 Medium: speculum metal Size: diameter: 291 mm Click here to buy a bespoke print of this image.

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