Zhang Nan has also already thought about what kind of steam engine he wants to replace from the system, and what Zhang Nan wants to change is the reward given by the system, that is, the model of a small steam engine, although it is a model, but it is fully functional.

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

The rise of the Industrial Revolution was only in the 60s of the 18th century, when a series of important inventions appeared in the new industry of Britain, the cotton textile industry, and machine production gradually replaced manual labor.

Later, it expanded to other industries, and this major change in industry, science, and technology was different.

And with the invention and application of a new power machine, the steam engine, mankind was brought into the age of steam.

What Zhang Nan has to do is just to copy the starting point of this industrial revolution, as for whether he can successfully enter the industrial revolution, Zhang Nan doesn't know, he can only resign himself to fate, after all, Rome was not built in a day, Zhang Nan's attempt to make a big stride, can only be said to be an attempt, if it is not successful, accidentally the step is too big and pulls the egg, it is not an accident.

If it is not successful, Zhang Nan will suggest that Li Er complete the first Datang university, and the teaching mode is completely in accordance with the modern one, so that Zhang Nan thinks that after a hundred years, Datang can still continue to promote its own scientific research, and no longer needs his own Celestial Empire to help Datang move forward.

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

"Qingquan, is this what you said about the Karakura that you can move on your own without manpower or livestock?" Mo Zu shook the steam engine in his hand and found that there was no response. I couldn't help but ask strangely.

"yes, that's right, that's it." Zhang Nan nodded and said.

"But old man, why didn't I find that it could move, besides, although this ingenuity is very exquisite, but it's just like that, what can it do." Mo Zu said with a frown.

"This thing is just a concept, as for what to make, use the principle of this thing to make it, and then enlarge it, you can pull bigger things, Mozu, you can study and study it yourself, if there is anything you don't understand, you can go directly to my house to find me." Zhang Nan said.

"In that case, then old man, I will thank you Qingquan first, and when the Tiangong Department is established, I will take these disciples of our Momen to join you, old man." Mo Zu said with a smile.

"No problem, in that case, I'm leaving, that kid, I'm also giving this thing, kid is going home, otherwise the family will have to worry about death." Zhang Nan said with a smile.

"Wait, I'll let Ah Da take you out of the village." Mo Zu heard that Zhang Nan was in a hurry to leave, and immediately put down the steam engine model in his hand and said.

"No, no, I'll just go by myself, and it won't be troublesome." As soon as Zhang Nan heard that Mo Zu wanted to let that Ah Da come to send him, he immediately shook his hand to refuse, just kidding, now Zhang Nan's head is still groggy because of that stumbling rope.

"Haha, Qingquan, it's not the old man who boasts about himself, the organs in front of this village are all designed by the old man himself, except for our Momen people who can enter and exit freely, no one else can touch the location of our Momen at all." Mo Zu stroked the beard on his chest, with a proud face.

"No wonder Li Er hasn't found me after looking for so long, I guess it's some kind of trick or something." Zhang Nan thought in his heart that although Zhang Nan was born under the red flag and grew up in the spring breeze, there were some things in ancient times that Zhang Nan really couldn't say that he could completely see through, so what Mozu said was so sure, Zhang Nan still believed it very much.

"That, it's okay to send me out, don't send me to Ah Da, change someone, I don't like Ah Da." Zhang Nan touched the big bag on his head and said.

Mo Zu glanced at Zhang Nan strangely, pinched his chin and thought about it, and then said, "Okay, I'll let Qing'er send you out." After speaking, Mo Zu shouted twice, and Qing'er came to the front of the two.

"Qing'er, you can send Qingquan out of the mountain on my behalf." Mo Zu commanded.

"Yes, Ancestor." Qing'er responded.

In the end, Zhang Nan was escorted by Qing'er and successfully walked out of this small village where he had been imprisoned for several days, although Zhang Nan deliberately memorized the route when he walked out of the village, but Zhang Nan found a fact, that is, his memory seemed to have been dropped a little worse, and he could remember what he could remember when he looked at it, but now Zhang Nan can't remember it.

Of course, this is just Zhang Nan's own feeling, if Zhang Nan can see the road he walked thirty seconds ago, Zhang Nan will find that the road he just walked will change, whether it is trees or grass, it will move, but Zhang Nan didn't see it, and thought that his head was a little inappropriate.

Qing'er sent Zhang Nan to the foot of the mountain, and then he was no longer in the same place, according to Qing'er, without the permission of Mozu, no one was allowed to leave Qinling easily. However, Zhang Nan had already arrived at the foot of the mountain, and Zhang Nan could return to Chang'an City by following the official road, so Zhang Nan did not ask Qing'er to send him home.

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

"Damn, that old man Mozu didn't give me back my horse, this is going to make my legs go back, I have to walk for a long time." After Zhang Nan finished shouting in his heart, he looked at his legs that were not in the same situation, and finally Zhang Nan changed a gearcar from the system, no matter what, Zhang Nan is not a person who makes himself tired.

Although the level of road repair in Datang is limited, the official road in Datang is still very smooth, and Zhang Nan is not very difficult to ride a gearbox, and it didn't take long for Zhang Nan to see Chang'an City, which he had missed for a long time.

"Ah, I'm Hu Hansan, no, I'm Zhang Hansan again." Zhang Nan propped up one foot on the ground and looked at the thick walls of Chang'an City and said.

Without too much hesitation, Zhang Nan rode a bicycle into the city, and rushed all the way to his house, he disappeared for so many days, and he didn't know what happened to the greedy wife at home.

When Zhang Nan thought of this, he sped up the speed of his feet again, and he couldn't wait to add two wings to the bicycle and fly back.

In the end, Zhang Nan finally saw his house and the familiar two words "Zhang Mansion" on the upper house.