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20ft
Mirror, speculum metal, believed to have been originally made for 20ft Herschel telescope but now mounted in wooden frame as a domestic freestanding mirror. Aperture 18.7"
***Need to look at acquisition file to determine if this is one of the 3 that went with JFWH to South Africa - also need to ascertain if this is Newtonian or Herschelian since the 20ft was used in both guises.
***Need to look at acquisition file to determine if this is one of the 3 that went with JFWH to South Africa - also need to ascertain if this is Newtonian or Herschelian since the 20ft was used in both guises.
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Object Details
| ID: | AST0879 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Newtonian primary mirror |
| Display location: | Not on display |
| Creator: | Herschel, William |
| Date made: | Unknown |
| Credit: | National Maritime Museum, Greenwich, London, Herschel Collection |
| Measurements: | Overall: 47.498 cm |