Newtonian secondary mirror
An elliptical plane mirror made as a secondary mirror for a Newtonian reflector telescope within the diagonal attachment, AST0867 (OL/85). The diameter of the minor axis of this mirror is 1.34 inches (34.036mm). The mirror is badly chipped, with many fine scratches.
In a Newtonian reflector telescope the eyepiece is at the side of the tube. Light comes in at one end, is reflected off the objective (or primary) mirror and onto this mirror which directs the light towards the eyepiece. 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.
In a Newtonian reflector telescope the eyepiece is at the side of the tube. Light comes in at one end, is reflected off the objective (or primary) mirror and onto this mirror which directs the light towards the eyepiece. 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.
Object Details
| ID: | AST0828 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Newtonian secondary mirror |
| Display location: | Not on display |
| Creator: | Herschel, Caroline Lucretia; Herschel, William Johann Alexander Herschel |
| Date made: | circa 1800 |
| Credit: | National Maritime Museum, Greenwich, London, Herschel Collection |
| Measurements: | Diameter: 34.036 mm |
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