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Polygonal telescope
This non-achromatic telescope has a ten-sided mahogany barrel and a single brass draw tube. There is no mechanical stop for the draw tube. The other brass fittings include sliding eyepiece and objective lens covers.
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Object Details
| ID: | NAV1662 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Polygonal telescope |
| Display location: | Not on display |
| Creator: | Unknown |
| Vessels: | Camperdown (1885); Vanguard (1835) |
| Date made: | circa 1770 |
| People: | Boys, Henry (RN); Boys, William H (RN) |
| Credit: | National Maritime Museum, Greenwich, London, Adams Collection |
| Measurements: | Length: 665 mm (closed), 774 mm (open, approx.); Diameter: 35-43 mm (barrel), 52 mm (max) |