Pocket telescope
This non-achromatic telescope has five draw tubes. The barrel is covered with sharkskin and is intricately decorated with silver pins. The draw tubes are made of hand-coloured vellum with fittings made of horn and silver and the eyepiece lens is set in a horn mount. The objective lens and possibly a lens cap are missing.
The name 'JOHN MA' is stamped on several tubes, suggesting that it was made by John Marshall, one of the leading opticians in London. He was a contemporary of Robert Hooke and worked in Ludgate Street.
The name 'JOHN MA' is stamped on several tubes, suggesting that it was made by John Marshall, one of the leading opticians in London. He was a contemporary of Robert Hooke and worked in Ludgate Street.
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Object Details
ID: | NAV1515 |
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Collection: | Astronomical and navigational instruments |
Type: | Pocket telescope |
Display location: | Not on display |
Creator: | Marshall, John |
Date made: | circa 1700 |
Credit: | National Maritime Museum, Greenwich, London, Caird Collection |
Measurements: | Length: 304 mm (closed); 909 mm (open to stop lines); Diameter: 44 mm (barrel) |