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Science Museum Group
© The Board of Trustees of the Science Museum
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:
- speculum (bronze alloy with arsenic) and pitch
- Measurements:
-
overall: 9 mm x x , 30 mm, .045kg
- type:
- components, metal mirrors and astronomical instruments
- credit:
- Lieutenant General A de Gorloff
