Pocket telescope
This brass telescope has a single draw tube and a tripod stand that fits inside when the telescope is not in use. The eyepiece has a thumbwheel, which allows the magnification of the telescope to be changed by selecting one of four numbered lenses. Numbered stop lines engraved on the draw tube correspond to each of the lenses and indicate the appropriate working length of the telescope. Inside the eyepiece assembly there is a smoked-glass filter that can be moved in front of the eyepiece lens in very bright conditions.
The maker's name, 'Dollond / London', is inscribed on the draw tube. The company was one of the leading makers of optical instruments in London from the 18th century onwards.
The maker's name, 'Dollond / London', is inscribed on the draw tube. The company was one of the leading makers of optical instruments in London from the 18th century onwards.
For more information about using images from our Collection, please contact RMG Images.
Object Details
ID: | NAV1516 |
---|---|
Collection: | Astronomical and navigational instruments |
Type: | Pocket telescope |
Display location: | Not on display |
Creator: | Dollond & Aitchison |
Date made: | circa 1770 |
Credit: | National Maritime Museum, Greenwich, London, Caird Collection |
Measurements: | Overall: 117 mm; Diameter: 42 mm |
Parts: | Pocket telescope |