Listening to Li Zheng's words, Xu Jingzong put his hands in his sleeves and thought, "It's time to come in a few days."

After saying that, Xu Jingzong thought for a while and said, "Don't all the grains in Lingnan are used as feed?"

Li Zheng sighed and said, "According to the current grain consumption of our farms, Lingnan's grain is more than enough to be used as feed. If there is too much grain, it cannot be wasted. Even the grain used as feed is still food."

Xu Jingzong nodded slowly, "Chang'an Order is still as thrifty as before."

As he said this, Xu Jingzong thought to himself that if the Japanese knew that the food sold to them was actually the feed used in Jingyang, they would not know what they would think.

Xu Jingzong bowed and said, "If nothing happens, I will go back to Chang'an and wait for news from Brother Zhu and the others."

Li Zheng nodded slightly.

After staying by the river in Jingyang for a while, Li Zheng thought in his mind that the Tang Dynasty's intelligence organizations had always had them.

From the gossip to the people who specialize in inquiring about the news.

There have been people operating since ancient times.

Even as early as the Warring States Period, some people specialized in intelligence warfare.

The time and time of an information, whether it is true or false, often determines many things.

Li Shimin also has an intelligence organization in his hands.

The intelligence organization he has should be bigger.

Li Zheng returned home with a teacup in his arms. The intelligence organization he needed did not need to be too large. If the intelligence organization was too large, it would easily form free stockings and gangs.

It can easily develop into a fight in the nest.

This can be seen from the Jinyiwei in later generations.

The intelligence team does not need to be too large, but it must be refined.

It is best to have a very experienced person.

The autumn harvest in the village has ended.

I have stored a lot of pumpkins at home.

Looking at the pumpkins built like a hill at the kitchen door, Li was rolling up his sleeves and making them to eat at night.

Stir-fried pumpkin, pumpkin soup, and pumpkin puree.

After cleaning up today's account book, Li Lizhi looked at the table of pumpkin vegetables and said, "It really makes you worry,"

Li Zheng said: "Pumpkin is actually a very nutritious ingredient."

When I was a child, I never ate pumpkin before coming to Jingyang.

But I heard Li Zheng talk about the food like pumpkin.

Li Zhi and Xiao Yizi also returned from the academy.

Seeing that Li Zhi was about to sit down, Li Zheng said, "Have you washed your hands?"

Li Zhi just sat down and stood up to wash his hands.

Xiao Yizi washed her hands sensible and consciously.

Li Lizhi picked up a piece of pumpkin and ate it. The pumpkin was very soft and fragrant.

It is a very mild food.

As soon as Li Zhi sat down, he started to eat it voraciously.

While eating, Li Zhi said, "The cylinder of hot steam is not easy to cast, and the iron is always bad to calcinate."

Li Zheng was eating slowly and said, "Did you encounter any problems?"

Li Zhi put down the bowl and chopsticks and burped, saying, "The main reason is the sealing. The iron lock on the boiler will crack if the temperature is too high."

Li Lizhi and Xiao Yizi also had dinner.

Xu Hui took the maids to clean up the dishes.

According to custom, Li Zheng likes to drink a cup of tea after a meal.

Xu Hui brewed a cup of hot tea and put it in front of Li Zheng and said, "The tea that Bingzhou just sent is said to be better than previous years."

Li Zheng took a sip of tea and saw Li Zhi keep looking at him.

After taking another sip of tea, Li Zheng put down the teacup and said, "Why does Your Highness King Jin look at me like this?"

Li Zhi said with a bright look: "You can definitely have a way."

Li Zheng smiled and said, "What can I do?"

Li Zhi said: "Even the boiler drawings were drawn by you."

Li Zheng sighed and said, "The ductility of iron is really not good. You can use copper to fix it at some key interfaces."

Li Zhi thought and said, "Bronze?

Cast copper is a serious crime.”

Li Zheng shook his fan and said, "We have silver coins in our family, and it's nothing to cast some copper. I think your father will like you to build this boiler, and he shouldn't blame you."

Some looked at Li Zheng skeptically, and Li Zhi said again: "Take it serious?"

Li Zheng frowned and said, "I guess."

After hesitating for a while, Li Zhi said, "Does this really require copper?"

Are copper and iron really different in ductility?”

Li Zheng said: "You'll know just by trying it. Iron University has rich experience in casting. In fact, you can ask him too."

After looking at Li Zheng again, Li Zhi returned to his room silently.

Go back to your room.

There was a little mess in the room.

Li Zhi looked at the drawing in front of him. This was a huge boiler drawing.

After studying thermodynamics for two months, Li Zhi recalled the research process and unexpectedly found that as long as Li Zheng corrected, most of the ideas were corrected.

This boiler uses the principle of thermal pressure.

As long as the boiler is heated, a large amount of hot air pressure will be generated in the pot.

This thermal pressure is sufficient to convert it into kinetic energy.

This can also solve many problems of the source of motivation that have always been confused about themselves.

If the problem of power source can be solved, Li Zhi feels that many of his tests can be verified.

The airtightness of the boiler is very important. Good enough airtightness can generate enough pressure.

The research institute has been conducting research on dynamics for a long time.

Many mechanics research is approaching a bottleneck.

Li Zhi had a feeling that as long as this boiler was built, it might break the bottleneck that the academy had been stuck in the theoretical position.

The big boiler in front of me uses almost all the dynamics knowledge I have learned so far.

With the application of thermodynamics, the source of kinetic energy is here.

Li Zhi felt inexplicably anxious when formulas, theories, experiments, and the boiler in front of him.

Looking at the dark outside the window, Li Zhi really wanted to go to the blacksmith shop to find a large iron boiler to build.

Li Zheng sat in his study and looked at the books in his hand. He had a lot of research on the construction of medieval ships.

The Age of Discovery is also an era where ships and science and technology develop very rapidly.

Now there is only information about the beginning of the Middle Ages.

At that time, it was also the time when the ship was loaded with the boiler.

When a ship encounters windless weather, it can only drive the ship by burning the fuel in the boiler.

Only after leaving the windless zone will the ship Yang Fan set sail.

Of course, the earliest sailing was without boilers. Once you encounter a windless climate or when you reach a windless area, you can only wait.

At that time, the old captain who had experienced and experienced sailed, and the charts became a crucial thing.

Of course, even if the detailed charts and experiences are found in the old captain, he will still be blinded when he arrives in the far sea, and it depends entirely on luck.

In the early days of the Age of Navigation, when there were no boilers and compass, the risk of navigating at sea was extremely great.
Chapter completed!