网站首页  词典首页

请输入您要查询的英文单词：

　

单词 speculum metal
释义
speculum metal
noun[U]
uk
/ˈspek.jə.ləm ˌmet.əl/us
/ˈspek.jə.ləm ˌmet̬.əl/
amixtureofcopperandtinthat was used in the past to makemirrors:
（旧时制镜用的）铜锡合金，镜青铜
Mirrors made of speculummetalmay have also beenproducedinChinaandIndia.中国和印度可能也生产过用镜青铜做成的镜子。
More examples
  • Mirrors of speculummetalwere hard toproduceand were onlyownedby thewealthy.
  • Speculummetalis analloyof around two-thirdscopperand one-thirdtin.
  • Asmallportionof speculummetal, whenanalysed,yieldediron.
  • Speculummetalandbrasscannot besolderedtogether by theordinarymethods.
SMART Vocabulary: related words and phrases
Chemistry: metals & metalworking
  • alloy
  • anti-tarnish
  • bar magnet
  • base metal
  • beaten
  • bimetallic
  • brazen
  • brazier
  • bullion
  • ferrous
  • galvanized
  • gild
  • gold leaf
  • magnet
  • manganese
  • silver plate
  • steelworker
  • vermeil
  • wrought iron
  • zirconium
See more results »
(Definition ofspeculum metalfrom theCambridge Advanced Learner's Dictionary & Thesaurus© Cambridge University Press)

Examplesofspeculum metal

speculum metal
Speculummetalwas very hard to cast and shape.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
He chose an alloy (speculummetal) of tin and copper as the most suitable material for his objective mirror.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
For nearly 200 yearsspeculummetalwas the only mirror substance that could perform this task.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
After much experiment, he chose an alloy (speculummetal) of tin and copper as the most suitable material for his objective mirror.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
He started building his own reflecting telescopes and would spend up to 16 hours a day grinding and polishing thespeculummetalprimary mirrors.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
Glass was also more thermally stable thanspeculummetal, allowing it to hold its shape better through temperature changes.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
The poor optical quality of the early polishedspeculummetalmirrors meant that telescopic sights were not practical.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
All of these larger reflectors suffered from the poor reflectivity and fast tarnishing nature of theirspeculummetalmirrors.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
This saved on the severe light loss the image would suffer if he had used aspeculummetaldiagonal mirror.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
Mirrors ofspeculummetalor any precious metal were hard to produce and were only owned by the wealthy.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
The material their primary mirror was made of wasspeculummetal, a substance that only reflected up to 66 percent of the light that hit it and tarnished in months.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
Sincespeculummetalmirror secondaries or diagonal mirrors greatly reduced the light that reached the eyepiece, several reflecting telescope designers tried to do away with them.
From
Wikipedia
Creatives commons iconThis example is from Wikipedia and may be reused under a CC BY-SA license.
These examples are from corpora and from sources on the web. Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge University Press or its licensors.
#https://dictionary.cambridge.org//dictionary/english/speculum-metal##
随便看

　

英汉词典包含213609条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。

　

Copyright © 1999-2024 qbania.com All Rights Reserved
更新时间：2025/3/10 11:54:33