Day or night telescope

This achromatic telescope has a mahogany barrel and a single brass draw tube. The other brass fittings include a sliding eyepiece cover and an objective lens cap. The maker's name is faintly engraved on the draw tube as 'J. Cox & Son, London'. The words 'Night or Day' are inscribed below, indicating that the telescope was designed for use in all light conditions and, therefore, has a relatively large objective lens to collect the maximum amount of light in poor seeing conditions.

Object Details

ID: NAV1651
Collection: Astronomical and navigational instruments
Type: Day or night telescope
Display location: Not on display
Creator: J. Cox & Son
Date made: circa 1800
Credit: National Maritime Museum, Greenwich, London
Measurements: Overall: 508 mm; Diameter: 62 mm
Parts: Day or night telescope