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Gregorian secondary mirror
A circular concave mirror made as a secondary mirror for a Gregorian telescope. This secondary mirror has a brass mount. It has a good polish except at the edge and has no cover.
William Herschel made and used Gregorian telescopes before moving on to Newtonian and later Herschelian (to his own design) telescopes.
William Herschel made and used Gregorian telescopes before moving on to Newtonian and later Herschelian (to his own design) telescopes.
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Object Details
| ID: | AST0832 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Gregorian secondary mirror |
| Display location: | Not on display |
| Creator: | Herschel, William |
| Date made: | circa 1773 |
| Credit: | National Maritime Museum, Greenwich, London, Herschel Collection |
| Measurements: | Overall: 14 mm; Diameter: 30.48 mm |