眼镜和眼镜蛇（Glasses and cobras）.docVIP

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