speculum metal
Concise Oxford English Dictionary © 2008 Oxford University Press:
speculum metal
▶noun an alloy of copper and tin used to make mirrors, especially formerly for telescopes.
'speculum metal' also found in these Oxford entries:
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speculum metalConcise Oxford English Dictionary © 2008 Oxford University Press: speculum metal ▶noun an alloy of copper and tin used to make mirrors, especially formerly for telescopes. 'speculum metal' also found in these Oxford entries:
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