Otaku Engineer in Great Tang Dynasty Chapter 1295: Arbor Day!

The microscope is not a unique product of advanced industrial society. It was polished entirely by hand in the beginning!

In 1590, two Dutch eyeglass craftsmen and their father started experimenting with lenses. They put some lenses in a circular tube, and an important discovery was born. Objects near the bottom of the tube are magnified, and the magnification is much higher than that of any single magnifying lens.

To a large extent, their first microscope can be regarded as an innovation and cannot yet be used as a scientific instrument because the magnification is only 9 times and the image is a bit blurry.

The first real microscope in the world appeared in the late 17th century. The inventor was Leeuwenhoek, a Dutch cloth merchant and pioneer of microscopes.

He grinds out a simple microscope, with only one lens, which can be held by hand for observation. By grinding fine products in an innovative way, Leeuwenhoek has achieved greater success than his contemporaries. He milled a small glass ball into a lens, and the magnification reached 270 times. You know, the magnification of other microscopes was only fifty times the highest. He used this lens to make the world's first practical microscope.

Currently, there is no shortage of artisans who can polish lenses in Li Zexuan’s workshop. Mo Lingwei also polishes lenses himself, but the most difficult part of a biconvex lens microscope is not the lenses, but a series of fine adjustment devices. Li Zexuan intends to imitate the style of Leeuwenhoek's microscope, connect a convex mirror with a long screw to a metal holder, and use the small displacement caused by the screw to advance the small focus during the microscope observation process!

Now there is no machine tool in the workshop, and the screws used need to be polished and carved by hand. This is relatively time-consuming.

"Shanchang, I understand what you mean! This microscope feels better than an astronomical telescope~!"

A course on the principle and manufacturing process of microscopes has been taught for nearly an hour. The small blackboard is full of light path diagrams and formulas. At this time, Mo Lingwei said excitedly.

Li Zexuan nodded slightly and said: "In general, a microscope is simpler than an astronomical telescope. After all, Miss Mo, you are very experienced in polishing lenses now!"

When Mo Lingwei heard it, she frowned and said: "Zhang Chang, it takes a lot of effort to polish the lenses. Look at my hands. They were smooth before, but now they are a bit rough. How can you marry someone in the future~ How about I call Xiao Ningzi over to help me polish the lens~?"

Looking at Mo Lingwei's slender jade hands, Li Zexuan was quite speechless. Where is it rough? Aren't you talking nonsense with your eyes open?

"Miss Mo, Shaoning has been busy building dams recently. Where does he have time? But what you said...it’s not unreasonable, so let’s let people make some skin-protecting babies in the future. How about giving you some~?"

In other words, cucumber mask can not only apply to the face, but also apply to the hands~?

Li Zexuan thought silently in his heart.

Mo Lingwei's eyes brightened when she heard it. Now everyone has a consensus that it is produced by Li Zexuan, and it must be a boutique. Although she does not know what can protect the skin, it does not prevent her from ordering a copy from Li Zexuan. !

"Okay, okay! The long mountain! That's it!"

.................

Walking out of the workshop rather speechlessly, Li Zexuan slandered in his heart. If Yan Shaoning marries Mo Lingwei home, it is estimated that Yan's family will be lively in the future!

This girl is lively and interesting, but sometimes very noisy~!

"Msang Gong, Daddy has a letter~!"

Back to Yunshan Courtyard, as soon as he entered the courtyard gate, Han Yuxi greeted him and said with a smile on his face.

"Oh~? What does the father-in-law's letter say? How is he doing there~?"

Li Zexuan asked with a smile, holding his wife's slender waist.

Han Yuxi didn’t break free, so she gave up. She turned to look at Li Zexuan and replied: “Daddy said that he bought three Zhuangzi over there and he has dug the sewage treatment pond near the mine. It has been put into use! He asked someone to buy a lot of quyuan ploughs from the workshop, and rent them for free to the people who don’t have ploughs. Now the spring ploughing there has started for several days!

Daddy also asked the people to drink boiled water. He said that if anyone found out who was drinking raw water, his rent would increase by half in the future. Now he has several villagers who like to drink boiled water the most in Yifang County! The magistrate Wang of Yifang County praised it many times! Oh, Dad also asked Xiang Gong in the letter, now that the cesspool is set up and the water quality of the river next to Zhuangzi has also improved, what else should be done~? "

Li Zexuan nodded slightly, and it seemed that Han Tianhu wanted to move Hanjiazhuang's previous development model over there! After pondering for a moment, he said:

"Since there is a cesspool, the next step is to plant trees! Plant trees next to the river. Once there are more trees, not only will the water in the river become clean, but the air you breathe will also become fresh!"

Lanzhou is rich in water resources. Not only does the Yellow River flow through the western part of Lanzhou, but there are also small rivers such as Lanhe, Lanyi River, and Weifen River. The rich water resources mean that food can be grown. The people living in the valley are very happy. It is for this reason that the political and economic centers of the dynasties before the Song Dynasty were all in the north!

However, this land on the Loess Plateau, after the population expansion of the Sui and Tang Dynasties and the wars of the late Tang, will experience very serious soil erosion, resulting in water pollution or even depletion. At that time, this land will not Next is the livable land, China's political and economic center will gradually move south!

The most direct and effective way to control soil erosion and water pollution is to plant trees. Not only does he plant trees in Yifang County, Li Zexuan also wants to advise Li Er to plant trees on a large scale in the waters near Chang'an.

Chang’an is the world’s largest super city today~IndoMTL.com~ has a population of one million, and the population exceeded two million at its peak. Don’t look at the “eight waters around Chang’an”. The serious overdraft of resources and ecological environment is destined to not last long!

Modern Xi’an has always been “warm but not hot” in all the capital cities of the country. A very important reason is the lack of water resources. Yes, modern Xi’an is short of water. "Chang'an", there is no water in modern times. If there is no Heihe water diversion project, Xi'an still does not know what will happen.

If Datang wants to stand on top of the world forever, if Chang'an wants to continue to prosper and "expand", then the tree planting and protection forest project must start now!

Han Tianhu's letter gave Li Zexuan the idea of ​​promoting the Arbor Day in the Tang Dynasty!

If the momentum is good, maybe it's really possible! The main thing is to think about how to convince Li Er!

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