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Newtonian secondary mirror
An elliptical plane mirror made as a secondary mirror for a Newtonian reflector telescope. The diameter of the minor axis of this mirror is 33.02mm. This mirror has no mount but does have a brass backing with three screw holes and a cover marked 'No. 1'.
William Herschel, with help from his brother Alexander and his sister Caroline made a number of these mirrors to go in the telescopes they made to use and to sell.
William Herschel, with help from his brother Alexander and his sister Caroline made a number of these mirrors to go in the telescopes they made to use and to sell.
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Object Details
| ID: | AST0814 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Newtonian secondary mirror |
| Display location: | Not on display |
| Creator: | Herschel, William; Johann Alexander Herschel |
| Date made: | circa 1800 |
| Credit: | National Maritime Museum, Greenwich, London, Herschel Collection |
| Measurements: | Overall: 5 mm x 50 mm x 33 mm |