Share this entry
speculum metal Line breaks: specu|lum metal

Definition of speculum metal in English:


[mass noun]
An alloy of copper and tin used to make mirrors, especially formerly for telescopes.
Example sentences
  • They were made of low-reflectivity speculum metal - a copper - tin alloy containing 45 percent tin.
  • The composition is 7 of tin to 22 of copper, melted twice over, as in speculum metal, to secure a perfect alloy.
  • They are now made by ruling, with a diamond-point, a polished surface, such as glass or speculum metal.
Definition of speculum metal in:
Share this entry

What do you find interesting about this word or phrase?

Comments that don't adhere to our Community Guidelines may be moderated or removed.

Subscribe to remove adverts and access premium resources