The waterwheel is a good thing for the benefit of the country and the people, the waterwheel that appeared in the Eastern Han Dynasty is only used for irrigation, but if some devices are installed on the main shaft of the waterwheel, whether it is used for forging or for grinding, it will have a very huge effect, and the only defect of the current waterwheel is that it is difficult to keep running for a long time, and the main shaft must be replaced after a while, even if it is a spindle made of steel, it will not take too long.

Bearings, which can effectively reduce friction, are most useful for waterwheels, as long as lubricating oil is continuously added to the bearings, it can be used for a very long time.

Since his son had already made it, there was no reason why he couldn't make it himself, so Jia returned to the study without saying a word and began to draw the drawings of the waterwheel.

The toy was damaged and could no longer continue to play, Jia Lu took Li Xiang to Jia Yi's room with nothing to do, compared to the little thing in his head, the toy made by Jia Yi should be more durable.

"Dad, you just saw it, the waterwheel I made will be damaged in a short time, do you have any good ways to help me improve it?"

Jia Lu came to Jia Yi and said his request, but when his eyes fell on the drawings drawn by Jia Yi, he was immediately attracted by the more advanced waterwheel shown on the drawings.

"What is this?" Jia Lu pointed to the two rings, one large and one small, on the side of the drawing, and there were many cylinders, and he didn't know what Jia Yi was painting this thing for.

"This is called a bearing, which can be very effective in reducing the wear of the spindle, as long as the lubricating oil is continuously added to it, it can make the spindle use for a long time, and the waterwheel you just made lacks this kind of bearing."

Jia Lu's little head couldn't think of the specific role of this bearing, but he knew that there would always be a lot of strange ideas in his father's head, and he firmly believed that everything that his father made would show their magical effect.

"Then, Daddy, hurry up and make it, I really want to play with Li Xiang."

What is there to play with the waterwheel, except for looking a little interesting, there is no playability at all, if Jia Lu and Li Xiang dare to climb on the waterwheel, without Jia Yi's hand, the eunuch who followed Li Xiang will drag him off the waterwheel, such a big child, I don't know what the danger is.

"Don't think about the waterwheel, I'll make you something more fun in a moment."

As a child, if you don't have a bicycle when you are young, you are embarrassed to tell others about your childhood, anyway, it takes a while to complete the production of this waterwheel, so I simply made two bicycles first.

The overall parts of the bicycle are very easy to make, the only difficulty is the bearings and tires, Jia Yi doesn't want Jia Lu to ride wooden tires all over the world to play, this is not a game, this is a crime.

The rubber cut from the rubber trees in Lingnan has been made into rubber products as early as in Lingnan, and the application on the giant ship is very extensive, and the place where the collision is against the need for rubber buffering, and there are just some warehouses at home, which are just used to make tires, although it will still be a little hard, but it is much lighter than rolling wood directly on the ground.

Before dark, a bicycle with training wheels was presented in front of Jia Lu, looking at these two bicycles made entirely of wood, the little Jia Lu and Li Xiang had already been attracted by this bicycle.

"I'll give you a demonstration first." After Jia finished speaking, he stepped directly on his own, and quickly stepped on the pedal under his feet, and the bicycle slowly started to run.

Seeing the joy of Daddy riding a bicycle, Jia Lu and Li Xiang couldn't stop applauding, but on the other hand, they hoped that Jia Yi would let them ride for a while.

The bicycle has training wheels, Jia Yi is not very afraid that they will be fallen, jumped off the bicycle, put Jia Lu on first, people who have just come into contact with the bicycle still have a bad balance, this requires continuous practice.

Li Xiang rode for a while, Jia Lu rode for a while, the two of them had a lot of fun, and basically mastered the balance of riding a bicycle, I believe that after a period of practice, they will be able to remove the training wheels.

This only one bicycle is obviously not able to meet the needs of the two children, the craftsman in the family under the command of Jia Yi, and quickly made one, but it was not placed in front of the two children, the reason, it is dark, it is time to go back to each house to find their mother, want to play, continue tomorrow.

Just after dinner, the family who had been watching over the instigator came to report to Jia Yi, saying that he had recruited everything.

A day of confinement is already very capable of a person who can endure half a day of grass in his heart, but he didn't expect this guy to endure it all day, but that's it, if he continues to endure it, he will go crazy.

"Someone, talk to me, let me say anything."

As soon as he came to the basement, a burst of almost roaring wails came into Jia Yi's ears, which made the corners of his mouth set off a slight arc, whether the confinement room is in the future or in the Tang Dynasty is a very useful means, allowing people to directly face the loneliness in their hearts, and then fight loneliness on the most unlikely occasions to overcome loneliness, I believe that no matter who it is, they will be defeated in the end.

"Say it."

After the instigator heard Jia Yi's words, he burst into tears, I really don't know what kind of terrible scene he thought of during this day, Jia Yi just said two words, but this person's mouth was gushing all the things he knew, although many words were useless nonsense, but this person didn't care about it, his eyes were fixed on Jia Yi, and he explained his life clearly.

Jia Yi didn't have any interest in those nonsense, but he already knew who the owner behind this matter was, and what made Jia Yi couldn't believe was that the little Hou Shixian had such a scheming.

Now that he knows who the black hand behind it is, Jia Yi directly asked people to let the instigator go and let him leave here, he is not as useful here as if he went back to report the news.

For Hou Junji's grandson, Jia Yi will not surrender his identity to verify or ask for guilt, after all, General Hou is still on the grassland, as for whether he has begun to plan a rebellion, this is only known to him, compared to directly fighting with the Hou family, Jia Yi wants to give them a chance, after all, they are attached to Li Chengqian.

Early the next morning, Jia had breakfast early and came to the school, everything in the school is developing in the direction he expected, and today the people who heard the news led their children to the gate of the school, as long as it is an ordinary people, as long as there are no bad deeds, Jia Yi will order someone to include it in the school.

Early in the morning, the students finished their morning exercises under the leadership of the guards, and took their lunch boxes to the direction of the cafeteria to make breakfast, because the school had just begun, in order to give them a process of adaptation, Jia Yi did not arrange too many learning tasks for them during the initial period, but was ready to let them integrate into this small group first, and adapt to some of the school's regulations.

Seeing that none of the students had happy smiles on their faces, Jia Yi knew that his goal was developing step by step in the direction he envisioned, but this speed would be a little slow, after all, most of the people who came here were illiterate, and it would take at least ten years for them to become talented.

Just when Jia Yi felt that the time was really not enough, a team of people appeared behind him, and the leader turned out to be the crown prince Li Chengqian.

Seeing Li Chengqian coming, especially with a group of people behind him, Jia Yi didn't want people to find fault with him, so he respectfully greeted Li Chengqian, and then stood beside Li Chengqian, who jumped off the horse.

"Jia Yi, today Gu has brought you some people, all of whom want to learn your knowledge, I don't know if you are willing to teach them."

The people who followed behind Li Chengqian were basically middle-aged people, looking at the clothes they were wearing, they knew that they should be the people who were in prison, Li Chengqian's meaning of this arrangement Jia Yi already knew it, it was nothing more than opening a school to recruit new students, first cultivating this group of people who were working for Datang, and Datang would have to wait for ten years.

"No problem, as long as they want to learn, I will teach them everything I know, from today they will be students in the upper grades of the school, enjoy all the benefits of the school, the study period is two years, as for how much they can learn, it depends on their hard work."

After listening to Jia Yi's words, these people bowed directly to Jia Yi, and then walked in the direction of the school, but the two people standing behind Li Chengqian attracted Jia Yi's attention, one was Hou Shixian he had seen, and the other knew who he was without guessing.

"Jia Yi, let me introduce you, this is Hou Yong, this is Hou Yong's son Hou Shixian, I think you should have seen it."

"Yes, of course I have seen it, if I hadn't seen it, I wouldn't have been stabbed in the arm by him." Jia looked at Hou Shixian with a smile, and Hou Shixian's cold gaze finally made Hou Shixian know that he was scared and hid behind Hou Yong.

"Jia Hou, this kid is not sensible, he has done such a rebellious thing, I brought him today to be at your disposal, as long as Jia Hou can be happy, even if you beat him to death, I will not help him say a word."