Microscopes were not a unique product of advanced industrial society. In the beginning, microscopes were made by hand!
In 1590, two Dutch opticians and their father began to try to make microscopes with lenses. They put some lenses into a circular tube, and an important discovery was made. Objects near the bottom of the tube were magnified, and the magnification was much higher than that of any single magnifying lens.
To a large extent, their first microscope could be considered an innovation. It could not be used as a scientific instrument because the magnification was only nine times, and the image was somewhat blurry.
The world's first real microscope appeared in the late 17th century. The inventor was Leeuwenhoek, a Dutch cloth merchant and pioneer of microscopes.
He made a simple microscope by himself. It only had one lens that could be held in the hand for observation. Leeuwenhoek made greater achievements than his contemporaries by making lenses in an innovative way. He made a lens out of a small glass ball, and the magnification reached 270 times. At that time, the magnification of other microscopes was only 50 times. He used this lens to make the world's first practical microscope.
Currently, Li Zexuan's workshop had no shortage of opticians who knew how to polish lenses. Mo Lingwei also knew how to polish lenses. However, the most difficult part of a biconvex microscope was not the lens, but a series of fine adjustment devices. Li Zexuan planned to imitate Leeuwenhoek's microscope. He would connect a convex lens with a long screw to a metal holder, and through the small displacement caused by the screw, he would be able to adjust the focus of the microscope!
Currently, there were no lathes in the workshop. The screws needed to be polished and carved by hand, which was more time-consuming.
"Yamachō, I understand what you mean! This microscope should be easier to make than astronomical telescopes! "
The lecture on the principle and manufacturing process of microscopes lasted for almost two hours. The small blackboard was full of light circuit diagrams and formulas. At this time, Mo Lingwei said excitedly.
Li Zexuan nodded slightly and said, "Generally speaking, microscopes are simpler than astronomical telescopes. After all, Ink Girl, you are very experienced in polishing lenses!"
Mo Lingwei immediately frowned and said, "Yamachō, polishing lenses is very troublesome. Look at my hands. They used to be smooth, but now they are a bit rough. How can I get married in the future ~? How about I ask Shao Ning to help me polish lenses ~? "
Looking at Mo Lingwei's white and flawless slender hands, Li Zexuan was speechless. How was it rough? Wasn't she lying through her teeth?
"Ink Girl, Shao Ning has been busy building dams recently. How can he have time? But what you said is not unreasonable. How about this, I will ask someone to make some skin protection treasures in the future. How about I give you some ~? "
Speaking of cucumber masks not only on the face face, but also on the hands?
Li Zexuan thought silently in his heart.
Mo Lingwei's eyes lit up. Now everyone had a consensus that Li Zexuan's products must be the best. Although she didn't know what could protect her skin, it didn't stop her from ordering one from Li Zexuan!
"Okay, okay! Yamachō! Then it's settled! "
… … … … …
Helplessly, Li Zexuan walked out of the workshop. He cursed in his heart. If Yan Shaoning married Mo Lingwei, the Yan Family would be lively in the future!
This girl is lively and interesting, but sometimes she is very noisy ~!
"Husband, Dad wrote a letter ~!"
When he returned to the Yunshan residence, Han Yuxi greeted him as soon as he entered the courtyard.
"Oh ~? What did father-in-law say in the letter? How is he doing over there ~? "
Li Zexuan held his wife's slender waist and asked with a smile.
Han Yuxi struggled but couldn't break free, so she gave up. She turned her head to look at Li Zexuan and replied, "Father said that he bought three farmsteads over there and has already dug the sewage treatment pond near the mine. It's already in use! He asked someone to buy a lot of curved plows from the workshop and rented them for free to the people who don't have plows. The spring plowing over there has already started a few days ago!
Father even let the commoners drink boiled water. He said that if anyone was found to drink unboiled water, their rent would increase by five percent. Now, Father's manors were the manors in Yifang County that loved to drink boiled water the most! County Magistrate Wang of Yifang County has praised them many times! Oh, Dad also asked you in the letter. Now that the sewage treatment pond is done and the water quality of the river beside the villages has also improved, what else should be done ~? "
Li Zexuan nodded slightly. It seemed like Han Tianhu wanted to move the Han Family Village's development model over there! He pondered for a moment and said,
"Since there is a sewage treatment pond, the next step is to plant trees! Plant trees beside the river. Once there are more trees, not only will the water in the river become cleaner, but the air will also become fresher! "
Lan Province was rich in water sources. Not only did the Yellow River flow through the western part of Lan Province, but there were also small rivers like the Lan River, Lan Yi River, and Wei Fen River. Rich water sources meant that there was a variety of crops, so the people in this area lived a very happy life. It was also because of 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 of the Sui and Tang Dynasties, as well as the chaos at the end of the Tang Dynasty, serious soil erosion would occur in the Loess Plateau, causing the water source to be polluted and even dry up. At that time, this land would no longer be a livable land, and China's political and economic center would gradually move southward!
The most direct and effective way to control soil erosion and water pollution was to plant trees. Not only did they plant trees in Yifang County, Li Zexuan also wanted to suggest Li Er to plant trees in the waters near Chang 'an on a large scale.
Chang 'an was currently the largest city in the world, with a population of over a million. At its peak, the population exceeded two million. Even though Chang' an was surrounded by eight rivers now, behind the prosperity of Chang 'an was a serious drain on its natural resources and ecological environment. It was destined to not last long!
The modern Chang 'an had always been' lukewarm 'among all the provincial cities in the country, and one of the most important reasons was the lack of water. Yes, the modern Chang' an lacked water. The Tang Dynasty's' eight rivers around Chang 'an' had no water left in the modern era. If not for the Heihe River Diversion Project, who knew what would happen to Chang 'an?
If Tang Dynasty wanted to stand at the top of the world forever, and if Chang 'an wanted to continue to prosper and' expand ', then the forest protection project had to be started now!
Han Tianhu's letter gave Li Zexuan the idea of promoting Tree Planting Day in Tang Dynasty!
If the momentum was good, it might really work! The main thing was to think of a way to convince Li Er!
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