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speculum metal

Saltos de línea: specu|lum metal

Definición de speculum metal en inglés:

sustantivo

[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.

Definición de speculum metal en:

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Palabra del día tenebrous
Pronunciación: ˈtɛnɪbrəs
adjective
dark; shadowy or obscure