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What (who) is speculum metal - definition
speculum metal
¦ noun an alloy of copper and tin used to make mirrors, especially formerly for telescopes.
Speculum metal
Speculum metal is a mixture of around two-thirds copper and one-third tin, making a white brittle alloy that can be polished to make a highly reflective surface. It was used historically to make different kinds of mirrors from personal grooming aids to optical devices until it was replaced by more modern materials such as metal-coated glass mirrors.
Speculum feathers
PATCH ON INNER BIRD WINGS
Speculum (biology); Wing speculum; Wing-speculum; Speculum feather
The speculum is a patch, often distinctly coloured, on the secondary wing feathers, or remiges, of some birds.
Wikipedia
Speculum metal
Speculum metal is a mixture of around two-thirds copper and one-third tin, making a white brittle alloy that can be polished to make a highly reflective surface. It was used historically to make different kinds of mirrors from personal grooming aids to optical devices until it was replaced by more modern materials such as metal-coated glass mirrors.
