Telescope objective lens

Description

Telescope objective lens made by James Buckingham of London, 1862, assisted by William Wray

Museum reference

T.1988.69

Collection

History of Science

Object name

Telescope objective lens

Production information

Wray
London, England, Northern Europe

Materials

Glass

References

The Engineer, 1 January 1869, 5-6: "This glass is 21 3/16" in diameter, the acting aperture being 21 3/6", and the focal length is 28' 5". The glasses of this objective are of foreign manufacture, the finished lens is without optical defect, and the surfaces have what opticians call a 'black polish', that is to say they are devoid of all traces of the grinding marks, so that as little light as possible is lost."