Portable telescope

This barrel and three draw tubes of this telescope are covered in vellum and the barrel is decorated with gold tooling. Stop lines on the draw tubes indicate the optimum working length of the telescope. The lenses are set in horn mounts, although the objective lens (which would have been non-acrhomatic) is now missing. There is a sliding eyepiece cover made of brass.

Object Details

ID: NAV1558
Collection: Astronomical and navigational instruments
Type: Portable telescope
Display location: Not on display
Creator: Unknown
Date made: circa 1740
Credit: National Maritime Museum, Greenwich, London, Caird Collection
Measurements: Overall: 410 mm; Diameter: 51 mm
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