"This is not necessary, the so-called twisted melon is not sweet, let's see the situation!"

This time there was still plenty of time, so Yang Yun asked Tie Feng to take him to see the ironware workshop. Iron Mountain has been running this blacksmith shop for decades, and it has a good reputation in the neighborhood, and there are many ironware that will be sent out throughout the workshop.

Yang Yun took a big knife from the shelf, looked at it carefully, and then took out the sword given to him by Emperor Fu from his waist, and slashed it at the blade of the big sword. After a crisp sound, Yang Yun raised the sword and looked at it, a big hole appeared on the big knife, if it was like this a few times, this knife would have to be broken, and then look at his long sword, it was actually intact.

Seeing this scene, Tie Feng's face flushed slightly, because this big knife was made by himself.

"How can we improve the quality of this iron craft?" Yang Yun asked while checking the two weapons.

"To make good iron, flame temperature, forging and quenching are very important, forging and quenching are okay, you can make up for it with experience, but the increase in flame temperature, and maintaining a stable temperature, is a difficult problem to solve." Before Tie Feng could answer, Tie Shan, who had just walked in, replied.

"Take me to see the stove! Maybe I can give you some advice. "A prince who has been in the palace for a long time understands this, although everyone is suspicious, but the young master is interested, and everyone has to cooperate.

Tie Shan took Yang Yun to the stove, Yang Yun looked around, thought for a while and said, "If a blower device is added here, it will be of great help to the temperature and stability of the flame." ”

Looking at the dazed look of the Tie family's father and son, Yang Yun told the two the principle of the bellows, and drew a sketch of the bellows for the two. The father and son of the Tie family have rich experience in making iron tools, and after listening to the principle and looking at the drawings, they immediately found that this thing can indeed play a great role, and they can't help but be very surprised that this prince, who almost never leaves the palace, actually knows these things.

Although Yan Feifei didn't know how to build iron tools, from the eyes of the Tie family's father and son, she could see that the advice of the thirteen princes was indeed of great help to them. Unexpectedly, this young man also knew how to forge iron, which aroused her curiosity.

"The young master is a little eccentric! With such a good idea for Tie Feng, why don't you give the Flying Eagle Department some benefits! Yan Feifei said with a smile.

Yang Yun has been thinking about the development of the Shadowless Guard these days, and he already has some ideas in his heart, even if Yan Feifei doesn't ask, he will give the Flying Eagle Department a little advice.

"How do you Flying Eagle usually use to deliver emergency messages or send letters from a distance?" Yang Yun turned around and asked Yan Feifei.

"Generally, the transmission of news relies on fast horses, and the military will use beacons in emergency wars, is there any other way?" Yan Feifei was a little puzzled.

"Didn't you use the flying pigeons to pass the book?" Yang Yun asked.

"What? Flying Pigeon Biography? "I haven't heard of it, Yan Feifeidao.

Yang Yun only knew that in ancient times, flying pigeons were a common method used by people to transmit messages, but he didn't expect that people here had not used this method. So he told Yan Feifei about this knowledge he had mastered, although Yang Yun didn't know much about the flying pigeon biography, but with this direction, I believe that Yan Feifei's talent should be able to figure it out.

Talking with the Tie family father and son and Yan Feifei, I learned about the current situation of the two parts. Yang Yun also talked to a few people about his thoughts and put forward his own hopes for the development of Wuyingwei. After Yang Yun finished speaking, Tie Feng and Yan Feifei were very happy, although this young master was not very old, he could see that he was a very thoughtful person, and with such a master, he would have the opportunity to do something big.

At this time, the sound of "Bang Bang" suddenly came from outside the small courtyard. When Yang Yun heard it, it turned out to be the voice of the husband, and everyone was very engaged in talking, forgetting the time, but I didn't expect that it would be five watches now.

Although it has been clearly required that the eunuchs and palace maids in Ningyu Palace are not allowed to enter their rooms without permission, there is no guarantee that there will be no accidents. Therefore, Yang Yun immediately left Tie Shan and the others, hurriedly drilled into the tunnel, and rushed to Ning Yu Palace.

In a hurry, the pace of his feet was much faster than usual. Who knows, it is easy to make mistakes when he is busy, and without looking at the road carefully, Yang Yun stepped into a small pit and fell into the tunnel.

Due to the relatively fast speed, Yang Yun was choked enough this time, his head hit the stone wall of the tunnel hard, and the fire fold also fell to the side, so painful that he didn't get up for a long time.

After a long time, Yang Yun regained his strength and got up from the ground to pick up the fire fold on the ground. At this time, I saw the small pit that caused me to fall, there was a small stone slab next to the small pit, which should have been covered on the small pit, but it may have been in disrepair for a long time, and the stone slab slipped away, revealing this small pit.

And in the small pit, there is a small stone ball that is exactly the same as entering and exiting the tunnel. The first few times I came in, I only paid attention to the top and sides of my head, but I didn't expect that there was a small stone ball here.

I knocked on the stone wall of the tunnel next to me with my hand, and found that the sound coming from the stone wall on my left was a little abnormal, and the back of the stone wall should be empty. Coupled with the small round ball of the control mechanism, Yang Yun thought that this secret passage still had a fork here, and he didn't know where it led.

It was too late now, and if he didn't go out of the tunnel at this time, it would easily arouse the suspicion of the people in Ning Yu Palace, so he gave up the idea of checking it.

Putting the small stone slab back in its original position, when Yang Yun hurried back to his room, it was already a little bright, and he hurriedly climbed onto the wooden couch and fell asleep. But it wasn't long before a shout woke him up.

"Your Highness, it's time to get up, it's time for morning class!" Xiao Jingzi didn't dare to approach, so he had to stand at the door and shout anxiously.

There was no way, Yang Yun had no choice but to open his hazy sleepy eyes, dress neatly under the service of the eunuchs and palace maids, and hurriedly rushed to the Guozijian.

The old lady Zhao Qian looked at Yang Yun who was yawning constantly and shook his head. Zhao Qian is over 70 years old this year, and although he is a prince, he does not have much real power.

Because Yang Yuan, the emperor of Taizu of this dynasty, was the Duke of Fu Guo of the Jin State back then, and at the same time he was the Taifu of the Jin State, with a high and powerful position, after he ascended the throne, he learned from the past. Although it did not reduce the rank of the Taifu, it greatly reduced the actual power of the position.

Therefore, Zhao Gan's main task now is to teach the prince and the children of the royal family. But now he has no desires and no desires, and only thinks about teaching these children well.

The thirteenth prince, Yang Yun, is his most proud disciple, but he doesn't know what happened during this time, he was always listless, and he didn't wake up at any time, Zhao Gan was very heartbroken when he thought about it.

It took Yang Yun several days to catch up on sleep, and the next day he didn't need to go to morning class, so he prepared to go to the secret passage at night to figure out where the fork in the road leads.

Finally waiting for Ning Yu Palace to regain its tranquility, Yang Yun quietly burrowed into the tunnel. Not knowing where the fork in the road leads, and whether he will meet other people, Yang Yun changed into the night clothes that Tie Feng had prepared in advance, and covered his face.