Portable telescope
This is not a complete telescope, it is four draw tubes from a larger example. The surviving tubes are made of vellum, while the brass fittings include a sliding eyepiece cover. Stop lines, mostly rings of dots, on the draw tubes, indicate the optimum working length of the telescope. The barrel and objective lens, and perhaps some other draw tubes, are missing. This would have been a non-achromatic telescope.
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Object Details
ID: | NAV1597 |
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Collection: | Astronomical and navigational instruments |
Type: | Portable telescope |
Display location: | Not on display |
Creator: | Unknown |
Date made: | circa 1750 |
Credit: | National Maritime Museum, Greenwich, London |
Measurements: | Overall: 270 mm; Diameter: 38 mm |
Parts: | Portable telescope |
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