Zhang Nan had long thought about what kind of steam engine he wanted to replace from the system. What Zhang Nan wanted to replace was the reward given by the system, which was a model of a small steam engine. Although it was a model, it had complete functions.

Zhang Nan believes that as long as the Momen thoroughly studies this thing, the Tang Dynasty's steel output will reach a higher level, and it is not impossible for the Tang Dynasty to enter the steam era.

The rise of the Industrial Revolution was just beginning in the 1760s. A series of important inventions appeared in the emerging British industry, the cotton textile industry, and machine production gradually replaced manual labor.

Later, it expanded to other industries, and this has undergone major changes in industry, science, technology, etc.

The invention and application of a new power machine - steam engine, brought mankind into the steam era.

What Zhang Nan has to do is just to replicate the starting point of this industrial revolution. As for whether he can successfully enter the industrial revolution, Zhang Nan doesn't know, and he can only leave it to fate. After all, Rome was not built in one day. Zhang Nan's attempt to make a big move can only be said to be a try. If he fails to succeed and accidentally gets too big, it is not an unexpected thing.

If it fails, Zhang Nan would suggest that Li Er complete the first university of the Tang Dynasty, and the teaching model is completely based on modern times. In this way, Zhang Nan believes that after a hundred years, the Tang Dynasty will continue to promote its own scientific research, and no longer need his own time travelers to help the Tang Dynasty move forward.

Zhang Nan exchanged the model of the small steam engine and then handed it to Mo Zu, who was guarding the door. Mo Zu took over the well-made steam engine model and looked carefully.

"Qingquan, is this the trick you said that you can do it yourself without manpower or livestock?" Mo Zu shook the steam engine in his hand and found that there was no response. He couldn't help but ask strangely.

"Yes, that's right, it's this thing." Zhang Nan nodded and said.

"But old man, why didn't I find it moving? Besides, although this trick is very exquisite, it's just that, what can I do?" Mo Zu said with a frown.

"This thing is just a concept. As for what you make, use the principle of this thing to make it, and then enlarge it, you can drive larger things. Mo Zu, you can study it yourself. If you have any unknown place, you can go to my mansion to find me." Zhang Nan said.

"Since that's the case, then old man, I will thank you Qingquan first. When the Tiangong Department is established, old man, I will take these disciples from our Mo Sect to join you." Mo Zu said with a smile.

"No problem. Since that's the case, I'm leaving, and I've given this thing. I'm going home, otherwise I'll have to worry about it at home." Zhang Nan said with a smile.

"Wait, I'll ask Ada to send you out of the village." Mo Zu heard Zhang Nan's rush to leave, and immediately put down the steam engine model in his hand and said.

"No, no, I'll leave by myself, so there's no trouble." When Zhang Nan heard that Mo Zu wanted to let A Da come to see him, he immediately shook his hand and refused. Just kidding, Zhang Nan's head was still groggy because of the tripping rope.

"Haha, Qingquan, I'm not an old man, I praise myself. The mechanisms in front of this village were designed by the old man. Except for the people from our Momen who can enter and exit freely, no one can touch the location of our Momen." Mo Zu stroked his beard on his chest, with a look of pride.

"No wonder Li Er has been searching for so long but hasn't found me. I guess he is a trick or something." Zhang Nan thought to himself that although Zhang Nan was a good socialist young man born under the red flag and grew up in the spring breeze, there were some things in ancient times that Zhang Nan could not say that he could see thoroughly. So what Mo Zu said was so sure, and Zhang Nan still believed it very much.

"That, you can send me out. Don't let Ada send me out. If you change someone, I don't like Ada." Zhang Nan touched the big bag on his head and said.

Mo Zu looked at Zhang Nan strangely, pinched his chin and thought for a while, then said, "Okay, I'll let Qing'er take you out." After that, Mo Zu called out twice, and Qing'er came to the front of the two.

"Qing'er, just send Qingquan out of the mountain on my behalf." Mo Zu ordered.

"Yes, ancestor." Qing'er replied.

Finally, under Qing'er's escort, Zhang Nan successfully walked out of this small village that had been imprisoned for several days. Although Zhang Nan deliberately remembered the route when he walked out of the village, Zhang Nan discovered a fact that his memory seemed to have been a little worse. Zhang Nan could not remember it after looking at it.

Of course, this is just Zhang Nan's own feeling. If Zhang Nan could see the road he had walked thirty seconds ago, Zhang Nan would find that the road he had just walked would change, whether it was trees or grass, they would move. However, Zhang Nan did not see it, and thought it was a bit inappropriate for his head to be thrown.

Qing'er sent Zhang Nan to the foot of the mountain and stopped seeing him off. According to Qing'er, no one could leave the Qinling Mountains easily without Mo Zu's permission. However, Zhang Nan had already reached the foot of the mountain and followed the official road to return to Chang'an City, so Zhang Nan did not ask Qing'er to send herself home.

After saying goodbye to Qing'er, Zhang Nan finally embarked on a journey home. After walking a few steps, Zhang Nan realized a problem.

"Damn, that old man Mo Zu didn't return my horse to me. I'll leave for a long time." After Zhang Nan finished shouting in his heart, he looked at his legs that were not sure about his appearance. In the end, Zhang Nan changed a speed-changing car from the system. No matter what, Zhang Nan was not someone who made him tired.

Although the road construction level of the Tang Dynasty was limited, the official roads of the Tang Dynasty were still very flat, and it was not very difficult for Zhang Nan to ride a speed-changing car. Not long after, Zhang Nan saw the Chang'an City that he had longed for.

"Ah, I, Hu Hansan, no, I, Zhang Hansan, are back." Zhang Nan supported himself on the ground with one foot, and said as he looked at the thick walls of Chang'an City.

Without much hesitation, Zhang Nan rode his bicycle into the city and rushed to his mansion. He disappeared for so many days, and he didn't know how the greedy wife at home was like.

When Zhang Nan thought of this, he accelerated his speed again and wanted to add two wings to the bicycle to fly back.

Finally, Zhang Nan finally saw his house and the two familiar words "Zhang Mansion" on the house.
Chapter completed!