speculum metal

speculum metal

noun
any of several bronze alloys with a high tin content, often containing other materials, as silver, brass, lead, zinc, or arsenic, used for making mirrors and reflectors.
Also called speculum, speculum alloy.


Origin:
1790–1800

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World English Dictionary
speculum metal
 
n
a white hard brittle corrosion-resistant alloy of copper (55--70 per cent) and tin with smaller amounts of other metals. It takes a high polish and is used for mirrors, lamp reflectors, ornamental ware, etc

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