Definition of Speculum metal. Meaning of Speculum metal. Synonyms of Speculum metal

Here you will find one or more explanations in English for the word Speculum metal. Also in the bottom left of the page several parts of wikipedia pages related to the word Speculum metal and, of course, Speculum metal synonyms and on the right images related to the word Speculum metal.

Definition of Speculum metal

Speculum metal
Speculum Spec"u*lum, n.; pl. L. Specula, E. Speculum. [L., fr. specere to look, behold. See Spy.] 1. A mirror, or looking-glass; especially, a metal mirror, as in Greek and Roman arch[ae]ology. 2. A reflector of polished metal, especially one used in reflecting telescopes. See Speculum metal, below. 3. (Surg.) An instrument for dilating certain passages of the body, and throwing light within them, thus facilitating examination or surgical operations. 4. (Zo["o]l.) A bright and lustrous patch of color found on the wings of ducks and some other birds. It is usually situated on the distal portions of the secondary quills, and is much more brilliant in the adult male than in the female. Speculum metal, a hard, brittle alloy used for making the reflectors of telescopes and other instruments, usually consisting of copper and tin in various proportions, one of the best being that in which there are 126.4 parts of copper to 58.9 parts of tin, with sometimes a small proportion of arsenic, antimony, or zinc added to improve the whiteness.

Meaning of Speculum metal from wikipedia

- 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...
- coloured Speculum literature, a medieval genre Speculum metal, an alloy containing copper and tin used for making all-metal mirrors "Speculum", a song...
- A speculum (Latin for 'mirror'; pl.: specula or speculums) is a medical tool for investigating body ****s, with a form dependent on the **** for...
- time of Newton to the 1800s, the mirror itself was made of metal – usually speculum metal. This type included Newton's first designs and the largest telescope...
- During the period 1850–1900, reflectors suffered from problems with speculum metal mirrors, and a considerable number of "Great Refractors" were built...
- telescopes that succeeded it because of the poor performance of its speculum metal mirror. Chronological list of optical telescopes by historical significance...
- exact metals used in the alloy are maintained as family secrets; metallurgists suggest that the alloy is a mix of copper and tin, so a type of speculum metal...
- and phosphorus) Ormolu (zinc) Silicon bronze (tin, ****nic, silicon) Speculum metal (tin) White bronze (tin, zinc) Constantan (nickel) Copper hydride (hydrogen)...
- Isaac Newton built his first reflecting telescope. He chose an alloy (speculum metal) of tin and copper as the most suitable material for his objective mirror...
- on the surface of the metal. Bell metal Brastil Phosphor bronze Nickel bronzes, e.g. nickel silver and cupronickel Speculum metal UNS C69100 Copper is...