At the front of the crowd of onlookers, Fang Xuanling, Wang Qi and Li Jing looked at each other.

The eyes of all three of them revealed a mixed emotion.

There is not only an affirmation of Li Zhi's super talent, but also a worry about the situation in the court.

So far, the performance of the three princes has been excellent.

Among them, Li Chengqian, as the crown prince, is gentle and intelligent, and has performed well in handling court affairs on behalf of the emperor several times.

The second son, Li Tai, is the only one in terms of knowledge among the princes, and some of his political opinions are quite consistent with the emperor, and he is also deeply favored by the emperor.

Now the king of Jin, Li Zhi, is not only precocious, but also has a demon-like performance in the way of things.

Although such a situation seems to be a good thing for the royal family, in the eyes of the ministers of the court, it seems to increase the uncertainty of the heir to the throne.

Fang Xuanling and the others can imagine that above the court, I am afraid that there will soon be a force supporting King Jin.

The trust storm about Li Zhi came to an end temporarily with the advent of the new carriage.

Li Zhi also spent more time on his own studies.

Li Shimin originally wanted to revoke Li Zhi's appointment as a supervisor so that he could study with peace of mind, but Li Zhi refused.

He said to Li Shimin: "Father, many of the ideas of the sons and daughters still need to be realized with the help of the craftsmen in the prison, and I ask my father to allow the sons and daughters to continue to serve in the prison." ”

Li Shimin thought for a while and felt that Li Zhi's idea was right, so he agreed to his request.

While studying medicine with Sun Huipu, Li Zhi often asked Sun Simiao for medical advice.

During this period, he told Sun Huipu and Sun Simiao what he knew about the medicinal value of lime.

The two of them have seen more patients and have the opportunity to develop more uses for lime.

Li Zhi also learned a lot of health preservation methods from Sun Simiao, and whenever he was free, he would forcibly pull Li Shimin, Empress Changsun and Li Lizhi to exercise.

Li Shimin has experienced a hundred battles, and there are more than a dozen large and small injuries on his body.

He is still young, so the impact of these injuries on him is not obvious.

However, Li Zhi knew that if his body could not be adjusted as soon as possible, then some secret injuries would definitely have a great impact on his body in the future.

Empress Changsun's health is not good, and she has given birth to several children in a row, so it is even more necessary to strengthen physical exercise.

In order to make them more active in exercising, Li Zhi decided to pay for the construction of a large swimming pool in the palace.

Not only did cement be used for this pool, but Li Zhi also prepared to have some tiles specially fired for decoration.

At the same time, Li Zhi also designed a set of water supply system for the swimming pool with Yan Lide and others, and special pipes were used for water intake and drainage.

In order to increase the efficiency of boiling water, Li Zhi showed his talent in metalworking for the first time in front of people.

The boiler, an important product that was widely used in later generations, was launched thousands of years ahead of schedule.

When he put the boiler drawings in front of Yan Lide and the others, this group of top masters of the Tang Dynasty were all shocked and speechless.

They really couldn't imagine what kind of ingenuity it would take to think of such an amazing thing.

After a long silence, Yan Lide said excitedly: "The talent of the teacher is like a celestial being, and the student will have no regrets when he can see this thing die in his lifetime." ”

After listening to his words, Li Zhi waved his hand and said, "How can it be as magical as you say, but it's just a slightly larger copper kettle." ”

Yan Lide opened his mouth and said: "The teacher's words are too modest, the students and others are with the copper kettle all day long, but no one can think of such a far-reaching thing, it is really ashamed." ”

Yan Lide is right, tea culture began to prevail during the Tang Dynasty, and copper kettles as a utensil for boiling water are indeed something that many people often come into contact with.

However, this use has only just been developed, so it is impossible for people to come up with other ideas.

Li Zhi didn't want to entangle with them in this regard, so he changed the subject and said, "This thing is huge, and we need to study it carefully so that we can find the best way to make it." ”

After listening to Li Zhi's words, Yan Lide and the others all nodded.

Because the price of copper was too expensive, Li Zhi chose iron as a raw material for making boilers.

However, neither copper nor iron is capable of producing large profiles under today's conditions.

In addition, after having a profile, it needs to be further processed, and such a process is not available at present.

As a result, they need to tackle these problems from scratch, step by step.

And this also gave Li Zhi the opportunity to get in touch with the Datang ironmaking process.

Since the ironmaking workshop was under the management of the Shaofu Supervisor, Li Zhi took Yan Lide to find Pei Kuanshu together.

When Pei Kuanshu heard that Li Zhi wanted to visit the iron-making workshop, he immediately happily agreed.

Li Zhi's special talent in Gewu has long been widely spread in the court.

If you can take this opportunity to let Li Zhi give some guidance on the ironmaking process, wouldn't it be a profit?

Da'an Fang, where is located the largest ironmaking workshop in Chang'an City.

The proximity to Anhua Gate is convenient for the transportation of ironmaking materials.

At the same time, it is close to the Yongan Canal, which has sufficient water sources.

When Li Zhi and others arrived, they found that the fuel used here had been changed from charcoal to coke.

Several hydraulically powered blowers are blowing air into the kiln.

The head of the workshop was named Bakken, a Turkic man.

He came to Chang'an after the Turks were destroyed, and soon became appreciated by Li Shimin for his excellent iron-making skills, and thus became the head of the workshop.

Li Zhi visited this place under his leadership and found that the hearth is still commonly used now.

This method is too slow to make steel, and because the output of a single furnace is too low, it is not conducive to casting large workpieces.

When Li Zhi saw this situation, he immediately had the idea of building a blast furnace in his heart.

With a blast furnace, large quantities of molten iron can be produced, which makes it possible to cast larger profiles.

It just so happened that the construction of the pool would not begin until spring, which was the right time to renovate the blast furnace.

So Li Zhi immediately opened his mouth and asked Bakken, "Ba Tie Envoy, I wonder if you have ever considered hanging the furnace for iron smelting?" ”

After listening to Li Zhi's words, Bakken asked a little dazedly, "I don't know why His Highness had such an idea?" What are the benefits? ”

Li Zhi said: "This is what the king thinks, the earth furnace is placed on the ground, so when it is heated, it can only gradually melt the minerals from the bottom to the top. ”

Speaking of this, he pointed to one of the open-hearth furnaces and said: "In this way, the charge is not conducive to mixing, so that the composition of the molten iron cannot be uniform." ”

Bakken's eyes lit up when he heard this, and he said excitedly, "Your Highness means to make the furnace swing and stir it?" ”