Speculum Metal Mirror, 1850-70

Made:
1850-1870 in Patricroft
maker:
James Hall Nasmyth
Speculum metal mirror, one of four

Creative Commons LicenseThis image is released under a CC BY-NC-SA 4.0 Licence

Buy this image as a print 

Buy

License this image for commercial use at Science and Society Picture Library

License

Speculum metal mirror, one of four
Science Museum Group
© The Board of Trustees of the Science Museum

Speculum metal mirror, one of four, a flat circular tertiary mirror for use at the Nasmyth focus of Nasmyth's 20-inch reflecting telescope (?), Salford, England, 1850-70.

Details

Category:
Astronomy
Object Number:
1897-15/2
Materials:
speculum (bronze alloy with arsenic)
Measurements:
overall: 10 mm x x , 49 mm, .165kg
type:
components, metal mirrors and astronomical instruments
credit:
Lieutenant General A de Gorloff