When Li Yuanjia returned to Chang'an, it was not early.

But even if he felt a feeling of exhaustion, Li Yuanjia didn't dare to rest after arriving home, so he went directly to the study, and after flipping through it for a long time, he turned out a booklet.

Sit down at the desk and write non-stop.

Because of the strict order not to disturb any important matters, Li Yuanjia sat for a long time, until a bright light fell in front of his eyes, and at the same time he felt the breath of a person, he suddenly realized that the sky had already darkened.

Seeing the person who came to carefully put down the candlestick, Li Yuanjia's heart warmed, and he said softly: "Fengzhu, haven't rested yet?" ”

"How can I sleep when the king is not there?"

Smiling slightly, Fang Fengzhu didn't look at what was written in front of Li Yuanjia, but just blinked his eyes and said in a low voice: "Your Majesty, Your Majesty announced that you will enter the palace tomorrow......"

"Don't worry, it's just a little thing."

Seeing the princess's worried look, Li Yuanjia didn't let her finish her words, but just comforted her with a smile.

Although the messenger did not elaborate, Li Shimin still asked people to bring a sentence, announcing that he entered the palace because of the overturning...... It was such a sentence that made Li Yuanjia roughly guess the reason why the second child was looking for him.

The goal of 300 overturned cars a month has been achieved.

Therefore, in the next period of time, Li Yuanjia will withdraw the manpower sent by Chen Mu and others, and then return the hundred carpenters and one hundred miscellaneous servants to the emperor, and at the same time there is a workshop that has been built.

However, Li Yuanjia also knows that for an empire, these are definitely far from enough!

In the land of one state, maybe hundreds or even thousands of overturned cars are needed, how many are needed in hundreds of states in Datang? In particular, the great drought in dozens of states the year before last can be said to have made Li Shimin and the ministers of the DPRK and China feel uneasy, and the more objects such as overturned cars, the better.

So at this time, writing and drawing in the booklet, Li Yuanjia is making detailed calculations.

However, seeing that Fang Fengzhu was still a little worried, his heart moved, and he suddenly reached out and grabbed the princess's arm, and then with a little force, he fell into Li Yuanjia's arms with a sigh.

"The King's ......"

With a low groan, Li Yuanjia's heart fluttered, and Fang Fengzhu's slightly weak struggle made him even more restless.

But obviously the time and place are not quite right, so Li Yuanjia just teased his princess a little, and then chuckled: "Okay, Fengzhu, you go back to the room first, I will go to you after I finish writing this thing......"

……

The next morning, Li Yuanjia did not rush into the palace at the point of the previous court, but calculated the time and came to the gate of the palace before retreating.

After waiting for about a little more than a stick of incense, he got the emperor's order to announce his entry.

Entering the palace, Li Yuanjia was slightly surprised, because in addition to the emperor Li Shimin, there were several bigwigs left in the hall at this time, namely Fang Xuanling, Wei Zheng and the eldest grandson Wuji.

All acquaintances.

After stepping forward and saluting each other, Li Shimin waved his hand and smiled: "Sit down...... Knowing that you were coming, I specially asked someone to make you a pot of tea, how it tasted for you. ”

“…… Thank you, Your Majesty! ”

After a pause, Li Yuanjia immediately made a moved look, picked up the tea that the palace maid had just offered and took a sip.

This Tang Dynasty in the Zhenguan period is really likable!

If it is placed in the pigtail dynasty thousands of years later, even if he is a prince, when he sees the emperor, he may only have two shapes to pose, kneeling and standing, let alone drinking tea in front of the emperor or something......

Don't say it, this cup of tea doesn't taste bad.

Seeing Li Yuanjia's slightly surprised expression, except for Li Shimin's slightly indignant eyes, the other three bigwigs looked at the same time, and each had different thoughts in his heart.

Anyway, the corners of Fang Xuanling's mouth curved, and a flash of joy flashed in his eyes.

Although the emperor treated his brothers very well after the Xuanwumen Incident, like King Han, after entering the palace, he specially asked people to prepare tea, which was an extraordinary favor in the eyes of Fang Xuanling and others!

Then under the gaze of the three important ministers, Li Shimin spoke: "King Han, announcing your entry into the palace today is mainly for the overturn!" ”

"Hmm."

Nodding slightly, Li Yuanjia immediately straightened up and made a look of listening carefully.

After a slight pause, Li Shimin then smiled and said: "A hundred carpenters can build three hundred overturned cars in a month, which is two or three times faster than the masters in the palace...... To be honest, when King Han said this number, I really didn't believe it, haha. ”

"King Han's talent, the minister is also very impressed!"

After listening to the emperor's words, the eldest grandson Wuji also nodded with a smile and looked at Li Yuanjia: "But the minister has never understood very much, what method did the king use to make the craftsmen make so many overturns?" ”

"Hehe, it's actually very simple."

With a slight smile, Li Yuanjia explained the principle of assembly line and standardization in detail.

The assembly line is actually very easy to understand, it is nothing more than to divide the things that one person wants to do to more than a dozen people to do, and everyone will greatly increase the speed because of their proficiency; As for standardization, it is simpler, which means that the parts made by everyone can be universal, anyway, as far as the rollover they do is concerned, the accuracy is poor, and it is completely enough.

Li Yuanjia said it simply, and it is not difficult for everyone to understand.

They are all human spirits, and none of them have stupid brains, so there is no pressure to understand Li Yuanjia's most crude explanation. The only difficulty was how to distribute the carpenters and handymen to the maximum efficiency of their cooperation, which involved a little more complex calculations and a bit more difficult for a few old guys.

Fortunately, Li Yuanjia doesn't need to be too clear, as long as they understand this meaning, it is enough.

When Li Yuanjia said Wan, picked up the cup and drank who moistened his throat, Wei Zheng spoke on the side: "King, it doesn't sound difficult, why did it take more than half a year before?" It would be easy to teach craftsmen how to make one or two parts. ”

"Yes, it's easy to learn, but the workshop doesn't just teach them that."

Shrugging his shoulders, Li Yuanjia smiled: "They also have to find the optimal number of people to make each part, and the number of people who are responsible for the assembly at the end, and at the same time, they also have to improve the tools used by the carpenters, so that they can learn to make accessories strictly according to the specified length...... Truth be told, it's not an easy thing to do! ”

When he said this, Li Yuanjia also had a real headache.

If the matter is more than a thousand years from now, let alone find a hundred professional carpenters, or find a group of junior high school students, two months will be enough at most, half of which will be used to make them understand the principles, and the rest of the time will be spent learning carpentry work.

But in this day and age, you want to teach a bunch of rough people who can't read a single word to relearn the unit of length, and then let a guy with only simple training coordinate a hundred ...... No, it should be said that it is two hundred people to form a complete assembly line, and the difficulty is simply unimaginable!

The more people there are, the harder it becomes.

So after listening to his words, Fang Xuanling suddenly frowned, and said in a deep voice: "King, in this way, if you want more people to make more overturns, won't it still take a long time?" ”

"No, it's different."

After thinking for a while, Li Yuanjia shook his head and smiled: "If you give me another hundred carpenters and a hundred servants, it will only take two or three months at most to make them reach the same level......