When Chen Mu put a drawing drawing with the general structure of the microscope in his impression in front of Zhu Zaiyu, he heard King Zheng say that it was a bit difficult.

The so-called is a bit difficult, which means that His Royal Highness the Prince has to make a small calculation.

The big abacus is not good, Zhu Zaiyu's big abacus is every nine into one, and he specializes in calculating the data related to the average rate of twelve.

In this process, Chen Mu discovered a small shortcoming of King Zheng's son, and he lived by himself.

Maybe smart people have this problem, when the emperor was still young in the Forbidden City, Emperor Zhang Juzheng was always angry, obviously something you can know at a glance, you are already five years old, and you can't understand the book of sages?

This is also roughly what the prince of Zheng meant, for example, 'everyone knows that the world is round', and with one sentence, the vast majority of human beings on the earth were expelled from the human race.

But if you really want to talk about calculations, there are no difficulties in the whole process and design, and in the end, the three of them have always believed that the key to success is not in their hands...... In the hands of the craftsman who grinds the lenses.

Who can do this?

Does Changsheng have an optician?

And who can grind lenses to a higher precision than glasses?

There really is.

Changsheng Gang Road Jun Temple diagonally across the shop at No. 17 Ersheng Street, the owner of Mingxin Zhai Yufang crystal glasses, the handsome craftsman of the East, Xu Lu'an.

The apprentice jeweler who came out of Nanjing, the imperial court established the Xuanfu Ordnance Bureau to levy conscription, and went to Xuanfu to work as a stonemason and became a master craftsman, and then he never went back.

Over the years, he has processed a large number of Sulu pearls, Luzon gold, and Lion Country gemstones, and has accumulated a good skill until he followed Chen Mu to the Great Eastern Ocean and was ordered to open the No. 17 shop.

The earliest was to purchase the aborigines' jade jade, and later the jade material was more to process it by itself, for which Chang Sheng also set up a jade factory on the outskirts of the city, and now there are 100 workers doing this; Later, Chang Sheng burned glass, and he had more income from making glasses.

He not only grinds glass eyes, but also jade glasses, not only glasses that can make myopic eyes and presbyopia see clearly, but also glasses that are abnormal, for example...... Mingshinzhai sells glasses that allow you to see the four suns when you wear them.

But Xu Lu'an didn't know the principle that glass and jade could be seen clearly when polished into such shapes, but he knew that it was useful, so he specially recruited twelve people with different degrees of myopia, and they tried them on during the production.

The efficiency of production is not high, even if he has a factory with hundreds of people, it is enough for him to sell and make a profit, and the best thing they sell is a jade flat mirror that can see the four suns.

After all, the glasses business is limited, and how many people can be short-sighted? A glass glasses can be sold for 3,000 Tongbao, even if the jade can only be sold for six or seven thousand, the real money is still made of jade decorations that have no practical use.

The aborigines have a tradition of carrying jade, and in the past, only sacrifices and chieftains could have a lot of jade decorations; Nowadays, jade is in circulation, although it is smaller, but the jade craftsmen of the Ming Dynasty are more skilled, and even the aboriginal jade masons who have undergone their training can polish, carve, and polish extremely exquisite ornaments.

It may be a small jade pendant, it may be a hosta, it may even be a jade necklace or bracelet, even if most people only have one or two thousand tongbao a month, they can buy back a small ornament at a high price of six or seven thousand or even tens of thousands.

Therefore, the business of the seventeenth shop has been very good, even if the large-scale sale of jade has long ended, he can still make the entire factory run in an excellent financial environment by buying low and selling high, and carefully crafting, and even pays 50 to 1 million Tongbao taxes to the Toyo Military Government every month.

But this is a kind of hindrance for Xu Lu'an, although he is only a craftsman, he also hopes to make a big thing - to let future generations know that he Xu Lu'an has come to this big event in the world.

He had been wondering what he could do in this land, and although he had opened Asia's first jade shop for the Toyo Military Administration, had taken orders for forty telescopes from the Toyo Military Bureau, and had carved his name on the wooden-handled brass envelope of the telescope, it was not the kind of big thing he wanted to do.

Until Chen Mu found him again.

"Dashuai wants two convex mirrors and a concave piece?"

This is too simple for Xu Lu'an, they have the raw materials for making lenses, grinding materials, and most importantly, they have molds for making lenses - their process is far more advanced than ordinary people think.

"Yes, these three pieces are a set, make a few more sets, different sizes, different arcs, and when you are done, I will send someone to the wood yard to let them make the shell." Chen Mu thought that this was a very difficult task and asked, "If you hurry up, can you do it in ten days?" This is important. ”

He was already planning to make props, get some oranges, let it grow hair, and form a microscope with the clearest lenses, and let Zhu Zaiyu and Chen Shigong summarize the clear rules of lenses with Xu Lu'an, so that craftsmen can sharpen better lenses.

But he didn't expect his words to make Xu Lu'an stunned: "Ten days? ”

"The concave mirror can be made today, and the next twelve kinds will be about the same in ten days, but the convex mirror needs to be made in a ready-made mold, and it will not be done until tomorrow." Xu Lu'an said that he had already instructed the craftsman, and then said to Chen Mu: "Why don't you go with the villain to see how to make lenses?" ”

Chen Mu nodded, took out his pocket watch and looked at the time, and nodded in response.

Chen Shigong still didn't understand what the use of Chen Mu was doing this, he carried a magnifying glass with him, which could illuminate the veins and muscle textures during the dissection, but it was impossible to achieve what Chen Mu said - what the enemy who fought with him looked like.

It is worth mentioning that the magnifying glass, which is not a foreign product, was called 'Huoqi' in the Han Dynasty and possibly earlier times, and was the first to be used for fire.

The road from No. 17 Ming Xin Zhai to the jade factory is not far, the factories on the outskirts of the city are dense, just in time for the evening delivery of goods, along the road is full of trailers with Spanish donkeys, the drivers are wearing various colors of Jinghai clothes and short robes to raise the whip and shout, the car carries all kinds of goods commonly used by Changsheng.

The most common are wood, charcoal and coal, arrow shafts, arrow clusters, hemp rope, sacks, and iron basins and pots.

On the way, Xu Lu'an introduced to the three people who were out of the daily life of the people that Changsheng would open a big market in two days, and the merchants were busy preparing goods for this.

In the distance, they could see white smoke rising from the large chimney of the jade factory.

The factory building of Ming Xinzhai is very quiet, although dozens of craftsmen have gathered, everyone is doing what they are doing, and the vast majority of people are quietly attacking jade, except for the sound of the iron wheel grinding carefully.

In the kiln where the glass was fired, the two supervisors were scolded by Xu Lu'an for chatting in the factory.

They waited for about a moment before a craftsman, wearing thick gloves and carrying an iron rod, walked out of the kiln with a red-hot glass roll on the other side, softening and dripping down.

Xu Lu'an wiped the sweat from his forehead due to the high temperature of the factory, and said to Chen Mu: "Dashuai, it's started." ”