Polygonal telescope

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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)