Speculum Metal Mirror, 1840-60

Made:
1840-1860 in Patricroft
maker:
James Hall Nasmyth

Speculum metal speculum mirror, one of four, circular concave secondary mirror for use at the Gregorian focus of the reflecting telescope, Salford, England, 1840-60.

Details

Category:
Astronomy
Object Number:
1897-15/3
Materials:
pitch, speculum (bronze alloy with arsenic)
type:
metal mirrors
taxonomy:
  • components
credit:
Lieutenant General A de Gorloff
status:
Permanent collection

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