Speculum Metal Mirror, 1860

PART OF:: Four speculum metal secondary mirrors thought to have been made by James Nasmyth

Made:: 1860 in Patricroft

maker:: James Hall Nasmyth

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

Speculum metal mirror, one of four, a concave circular-shaped secondary mirror for use at the Gregorian focus of the telescope, 1860. Mirror mounted on brass circular plate with threaded circular boss in centre.

Details

Category:: Astronomy

Object Number:: 1897-15/4

Materials:: speculum (alloy of copper and tin) and brass (copper, zinc alloy)

Measurements:: overall: 20 mm x x , 46 mm, .225kg

type:: component, mirror, metal mirror and astronomical instrument

credit:: Lieutenant General A de Gorloff

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Speculum Metal Mirror, 1860

Details

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