眼镜和眼镜蛇(Glasses and cobras).docVIP

  1. 1、有哪些信誉好的足球投注网站(book118)网站文档一经付费(服务费),不意味着购买了该文档的版权,仅供个人/单位学习、研究之用,不得用于商业用途,未经授权,严禁复制、发行、汇编、翻译或者网络传播等,侵权必究。。
  2. 2、本站所有内容均由合作方或网友上传,本站不对文档的完整性、权威性及其观点立场正确性做任何保证或承诺!文档内容仅供研究参考,付费前请自行鉴别。如您付费,意味着您自己接受本站规则且自行承担风险,本站不退款、不进行额外附加服务;查看《如何避免下载的几个坑》。如果您已付费下载过本站文档,您可以点击 这里二次下载
  3. 3、如文档侵犯商业秘密、侵犯著作权、侵犯人身权等,请点击“版权申诉”(推荐),也可以打举报电话:400-050-0827(电话支持时间:9:00-18:30)。
  4. 4、该文档为VIP文档,如果想要下载,成为VIP会员后,下载免费。
  5. 5、成为VIP后,下载本文档将扣除1次下载权益。下载后,不支持退款、换文档。如有疑问请联系我们
  6. 6、成为VIP后,您将拥有八大权益,权益包括:VIP文档下载权益、阅读免打扰、文档格式转换、高级专利检索、专属身份标志、高级客服、多端互通、版权登记。
  7. 7、VIP文档为合作方或网友上传,每下载1次, 网站将根据用户上传文档的质量评分、类型等,对文档贡献者给予高额补贴、流量扶持。如果你也想贡献VIP文档。上传文档
查看更多
眼镜和眼镜蛇(Glasses and cobras)

眼镜和眼镜蛇(Glasses and cobras) In the mid thirteenth Century, Bacon, an English scholar, saw that many people were unable to read the text of the book because of their poor eyesight. They wanted to invent a tool to help people improve their eyesight. To this end, he thought a lot of ways, and did a lot of experiments, but none of them succeeded. One day after the rain, Bacon came to the garden for a walk, see the spider web with a lot of rain, he finds watching the leaves through the rain, a lot of vein amplification, even the leaves thin hair can be seen. He was overjoyed to see the phenomenon. Bacon immediately ran home, found carry off all that one has a glass ball. But through the glass ball, the text on the reading is still obscure. He also found a diamond and hammer, cut a piece of glass, take this piece of glass close to the book to see, the text really enlarged. The experiment succeeded, and Bacon was wild with joy. Then he found a piece of wood, dug a hole, the glass ball is up, then put a handle, convenient to carry, so people reading and writing more convenient. This kind of lens was improved and became the glasses people nowadays wear. Light vision correction have adolescents with myopia and elderly people wearing reading glasses and other glasses for various uses, people work more convenient. Bacon contributed to the progress of human civilization. According to the data, the glasses first appeared in 1289 in Italy Florence, it is said that the worlds most important tool, is a man named Armato opticist and a life in the city of Pisa in Italy invented by Spina. But some people think that the Chinese invented glasses before 2000. Although it is still a mystery who invented the glasses, it is an indisputable fact that our glasses appeared in the middle of Ming dynasty. Ming Tian Yiheng in stay green rizha 2 thick cloud: every article, asthenopia, do not know the details, the head cover, the spirit is not scattered, Ming letter strokes. The damask silk used toge

您可能关注的文档

文档评论(0)

f8r9t5c + 关注
实名认证
文档贡献者

该用户很懒,什么也没介绍

版权声明书
用户编号:8000054077000003

1亿VIP精品文档

相关文档