The boiler has been running for three hours and can continue to operate. As long as coal is added inside, the operation of the boiler will not stop.

Li Zhi sat down with satisfaction as he looked at the boiler. This was something that the big cow had not made.

Only at this moment did Li Zhi feel that he had truly learned something.

Although the operating principle of a boiler is simple, mechanics and thermodynamics are not something that ordinary people can understand.

For several days, Li Zhi stayed at the boiler. After five consecutive days of operation, the boiler finally overheated and broke down. This is the limit of the boiler now.

It can run continuously for five days at a time, but as long as the temperature and air pressure are controlled, it can last for a long time.

Tie Da saw that the thing he had finally made was broken again, and said with heartache: "Why did it break again?"

Li Zhi held the drawing and said, "Just build a few more according to this drawing!"

Tie Da didn't know what Li Zhi did to make such a strange thing, but he still did it.

Li Zhi returned to the academy and wrote down the process of casting boilers.

Daniu said, "Congratulations, the boiler has finally been built."

Li Zhi said: "The boiler is the power source."

Li Zhi has been specializing in mechanics in the past two years, and the source of motivation has always been a headache for him.

It's like a bottleneck. If a boiler cannot be built, then Li Zhi's mechanics will always be limited to the theoretical stage and will make no progress all day long.

The completion of the boiler is a reflection of Li Zhi's theory from theory to practice.

The bottleneck broke, Li Zhi felt as if he had walked out of his inner demon, and his whole body suddenly became enlightened.

What I have persisted in over the years has finally been verified.

Daniu said to Li Zhi: "I heard that you are going to work in the county magistrate's office in Jingyang during this period?"

Li Zhi stretched his muscles and bones and said, "It's true."

The big bull whispered: "This will be good for you, and you can let go of your body and mind. Being too addicted to it is not a good thing."

Li Zhi took a deep breath and said, "It's true. I won't come to the academy these days."

The big bull nodded, "When you adjust, we welcome you when you come back. You have always been a member of us."

Li Zhi grinned.

The moment I walked out of Jingyang Academy, I was doing the questions and learning difficult physics knowledge, as if I were right in front of me.

Looking at the students coming and going in the academy, Li Zhi felt that the world in front of him was much wider.

Li Zheng was sitting at home, looking at the file. The file was brought by Xu Jingzong, which said that there were all kinds of things in Chang'an now. Li Chengqian and Changsun Wuji were getting closer and closer.

The actions of envoys from various countries are also recorded on it.

The Japanese envoy and Goguryeo envoy went back after seeing Li Shimin.

The cold wind in winter blew again. Li Zheng tightened his clothes and drank a sip of hot tea. When he saw Li Zhi return and said, "Congratulations to His Highness King Jin, your boiler is successful."

Li Zhi looked at Li Zheng and said, "No matter what you say, I can build a boiler all depends on your guidance."

Li Zheng said, "Your Highness the King of Jin laughed. I just said it casually, but it was not considered a guide."

Li Zhi whispered: "Anyway, I can't build this boiler without you."

I have to say that Li Zhi is still too honest.

Li Lizhi could see clearly from the side.

When Li Zhi returned to his room, Li Lizhi came to Li Zheng and said, "Li Zhi is really..."

Li Zheng said: "I'm really not very smart, right?"

Li Lizhi said with a sad look: "Actually, what the so-called boiler really wants to make is you. You asked Li Zhixue to make mechanics and the manufacturing of the boiler is also your guide. You used it to make a boiler, and you arranged it from beginning to end, and he still didn't understand it."

Sometimes I think about Li Lizhi's IQ online, and sometimes I think about this woman's courageous and meticulous work.

Li Zheng held the tea and said, "I'm using him, you, the emperor sister, are angry?"

Li Lizhi whispered: "If I say I'm angry, will you apologize?"

The couple looked at each other and smiled.

Li Lizhi said: "Yizi is old and I plan to arrange a room for her at home. She is not young and can't let her stay by my royal sister all the time."

Listening to this, Li Zheng paid attention to Li Lizhi's eyes. Is this woman hinting at something?

Give Xiao Yizi a separate room so that Li Lizhi's bedroom will be vacant.

If it is a hint, it seems that this woman's face is not blushing and her heart is not beating when she says this.

Li Zheng took a sip of tea with a calm expression.

Li Lizhi said again: "I have contacted the woman from the Li family in Zhaojun. Li Xun said that she could run a coal mine business with us, and she also said that she was willing to hand over all the business north of Mangshan, that is, Guanzhong, to us."

Li Zheng frowned and said, "So generous?"

Li Lizhi said: "Of course she can't do such a big deal by herself. She probably doesn't have such great strength at all. She just needs to help her match her so that her business can enter Guanzhong. Besides, it will be beneficial to us, and..."

Speaking of this, Li Lizhi paused and said, "And she also said thank you for helping take care of the Wang siblings."

Li Zheng whispered: "She used us to open up a commercial road for her?"

Li Lizhi smiled, "This woman is quite good at taking advantage of the situation."

The scale of Jingyang's commercial scale is indeed very large, but it is also easy to form a situation where the tail is too big.

The majority of the benefits given to Li Shimin is also for the sake of future considerations.

Now more of Jingyang's focus is on Jingyang Academy and engineering teams, and it will take time for the sea ships in the East China Sea to be built to achieve some results.

Li Zheng said to Li Lizhi: "The blacksmith shop needs more copper and iron."

“Is it to cast the boiler?”

Li Lizhi whispered.

Li Zheng drank tea, "This boiler is of great use to our Jingyang. It can change our current manufacturing difficulties and also increase Jingyang's productivity to a higher level."

Li Lizhi was not confused about Li Zheng's words. Since Li Zheng said this, he could definitely achieve this effect.

After thinking for a while, Li Lizhi said: "The large amount of casting of copper and iron will inevitably attract the attention of the court. I will first write to my mother and then explain this matter."

Now Li Shimin has strict control over salt and iron, let alone copper.

Copper coins are related to the circulation of silver and money in the Tang Dynasty.

Li Lizhi looked at Li Zheng's expression, "Whether the father agrees or not, you will use copper and iron to cast the boiler, right?"

Li Zheng held his temple and looked sideways at the vegetable field in the yard and said, "I never thought of getting his consent."

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