Night telescope

This is a hand-held terrestrial telescope designed for use at night. It has a large non-achromatic objective lens to allow as much light as possible to enter the telescope. The telescope doesn’t have extra lenses to correct the inversion of the image, since the more lenses a telescope has, the greater the loss of light. The production of inverted images is typical of night telescopes.

The telescope has a leather-covered barrel and a single brass draw tube with a mechanical stop. The maker's name and the type of telescope are engraved on the draw tube: 'Cary, London. / NIGHT'. The eyepiece has a pivoted cover but the objective lens cap is missing.

Object Details

ID: NAV1485
Collection: Astronomical and navigational instruments
Type: Night telescope
Display location: Not on display
Creator: Cary, William
Date made: circa 1810
Credit: National Maritime Museum, Greenwich, London
Measurements: Overall: 710 mm; Diameter: 81 mm
Parts: Night telescope