The microscope is not a unique product of advanced industrial society. From the beginning, it was completely polished by hand!
In 1590, two Dutch eyeglass makers and their father began experimenting with lenses. They put some lenses into a circular tube and an important discovery was made. Objects near the bottom of the tube are magnified to a much greater degree than would be possible with any single magnification lens.
To a large extent, their first microscope can be considered an innovation that was not yet usable as a scientific instrument because the magnification was only 9x and the images were somewhat blurry.
The world's first true microscope appeared in the late 17th century. The inventor was Leeuwenhoek, a Dutch cloth merchant and microscope pioneer.
He made a simple microscope by himself, with only one lens that could be held by hand for observation. Leeuwenhoek achieved more than any of his contemporaries by crafting fine products in innovative ways. He ground a small glass ball into a lens, and the magnification reached 270 times. You know, other microscopes at that time had a maximum magnification of only fifty times. He used this lens to create the world's first practical microscope.
At present, Li Zexuan's workshop has no shortage of craftsmen who can polish lenses. Mo Lingwei can also polish lenses herself. However, the most difficult part of making a lenticular microscope is not the lens, but a series of fine adjustment devices. Li Zexuan plans to imitate it. Leeuwenhoek's microscope style uses a convex mirror connected to a metal holder with long screws, and uses the tiny displacement caused by the advancement of the screw to adjust the focus during microscopic observation!
There are no machine tools in the workshop now, so the screws used need to be polished and carved by hand, which is quite time-consuming.
"Chief Shan, I understand what you mean! This microscope should be better than an astronomical telescope~!"
A course on the principles and manufacturing techniques of microscopes lasted for nearly an hour. The small blackboard was full of light path diagrams and formulas. At this time, Mo Lingwei said excitedly.
Li Zexuan nodded slightly and said: "Generally speaking, a microscope is simpler than an astronomical telescope. After all, Miss Mo, you are very experienced in polishing lenses now!"
When Mo Lingwei heard this, she immediately frowned and said: "Chief Shank, polishing lenses is very laborious. Look at my hands. They used to be smooth, but now they are a bit rough. How can I get married in the future~? Otherwise Shall I ask Xiao Ningzi to come over and help me polish the lenses~?"
Looking at Mo Lingwei's flawless white and slender hands, Li Zexuan was speechless. How could they be rough? Aren't you just telling lies with your eyes open?
"Miss Mo, Shaoning has been busy building dams recently. Where does he have time? But what you said... is not unreasonable. Let's do this. I will ask someone to make some skin-protecting treasures in the future, and then I will give you some. How is it~?"
By the way, cucumber mask can not only be applied to the face, but also to the hands, right~?
Li Zexuan thought silently in his heart.
When Mo Lingwei heard this, her eyes lit up. Everyone now agreed that the product produced by Li Zexuan must be a high-quality product. Although she didn't know what could protect the skin, it didn't stop her from booking one with Li Zexuan first!
"Okay, okay! Chief Shan! Then it's settled!"
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Walking out of the workshop quite speechlessly, Li Zexuan cursed in his heart, if Yan Shaoning marries Mo Lingwei home, the Yan family will probably be lively in the future!
This girl is lively and interesting, but sometimes very noisy~!
"Ms. sir, there's a letter from dad~!"
Returning to Yunshan Villa, as soon as he entered the courtyard, Han Yuxi came up to him and said with a happy face.
"Oh~? What did my father-in-law say in his letter? How is he doing there~?"
Li Zexuan put his arms around his wife's slender waist and asked with a smile.
Han Yuxi struggled to free herself, so she gave up. She turned to look at Li Zexuan and replied: "Dad said he bought three villages over there and dug the sewage treatment tank near the mine. It is now in use. ! He asked people to buy a lot of curved shaft plows from the workshop, and rent them for free to the people who don't have plows. The spring plowing there has started for a few days now!
Dad also asked the people to drink boiled water, saying that if anyone found drinking boiled water, their rent would increase by half in the future. Now, several of his villages are the most popular ones in Yifang County for drinking boiled water! Magistrate Wang of Yifang County praised it many times! Oh, dad also asked my husband in the letter, now that the sewage tank has been completed and the water quality of the river next to Zhuangzi has also improved, what else should be done~? "
Li Zexuan nodded slightly. It seemed that Han Tianhu was trying to transfer Hanjiazhuang's previous development model there! After pondering for a moment, he said:
"Now that 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 cleaner, but the air you breathe will also become fresher!"
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 the Lan River, Lanyi River, and Weifen River. The rich water resources mean that food can be grown, so the people in this basin Life is very happy, and it is precisely for this reason that the political and economic centers of the dynasties before the Song Dynasty were all in the north!
However, after the population expansion in the Sui and Tang dynasties and the wars in the late Tang Dynasty, this land on the Loess Plateau will suffer from very serious water and soil erosion, leading to water source pollution and even depletion. At that time, this land will no longer be suitable. As the land grows, China's political and economic center will gradually move southward!
The most direct and effective way to control soil erosion and water pollution is to plant trees. Not only planting trees in Yifang County, Li Zexuan also wanted to suggest that Li Er plant trees on a large scale in the waters near Chang'an.
Chang'an is the largest super city in the world today, with a population of one million. At its peak, the population exceeded two million. Regardless of the current "eight rivers surrounding Chang'an", behind the apparent prosperity of Chang'an City is a serious overdraft of natural resources and the ecological environment. , destined not to last long!
Modern Xi'an has always been "tepid but not popular" among all the provincial capitals in the country. A very important reason is the lack of water resources. Yes, modern Xi'an is very short of water. In the Tang Dynasty, "eight waters surrounded Chang'an". In modern times, there is no water left. Without the Heihe River Diversion Project, Xi'an still doesn't know what would have happened.
If the Tang Dynasty wants to stand on top of the world forever, and if Chang'an City wants to continue to prosper and "expand", then the tree-planting and protective forest project must start now!
Han Tianhu's letter gave Li Zexuan the idea of promoting Arbor Day in the Tang Dynasty!
If the momentum is created well, maybe it really can be done! The main thing is that it’s time to think about how to persuade Li Er!
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