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简仪 [jiǎn yí]
[天] abridged armilla
- 还制作了简仪，现存紫金山天文台。
Also, the existing JianYi made ZiJinShan observatory. - 发明了世界最早的大型赤道仪--简仪，比欧洲早300多年；
the invention of the world's first large-scale equatorial mount - simple device, more than 300 years earlier than in Europe; - 采用这两种材料和脱水后再防护的工艺，使带锈防护后的浑仪、简仪的腐蚀低于无污染大气中的速率。
With these materials and the technology of protection after dehydration, the corrosion rate of the instruments protected with patina can reduce to lower than that of them in non-polluted air.
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