Long focus lens
The lens is labelled 'Ex RTC? [Reversible Transit Circle]/ Grubb Parson number 5438, 7.25 inches aperture, 1110 ft focal length'.
Object Details
| ID: | ZBA0718 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Long focus lens |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | Unknown |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Box: 53 mm x 228 mm x 230 mm |
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