Reliving a lifetime, Li Yuanjia lived very carefully.

For example, when it comes to weights and measures, he would never dare to build a system in the palace and then use it in a grand manner. If it weren't for the fact that what he had learned had already been deeply imprinted, Li Yuanjia wouldn't even want to take the initiative to touch these things, after all, trying to do something with weights and measures is not as simple as improving a zigzag plow or overturning.

In simple terms, that's power!

How long a foot is, how many feet is a zhang, only the imperial court or the emperor is qualified to decide, just like Qin Shi Huang unified the weights and measures when he ruled the world. Therefore, even if it is just to add some on the original basis for personal use in the palace, Li Yuanjia must first say hello to the emperor.

And the most basic standard must also be used by the imperial court.

Therefore, when he heard his younger brother say that he wanted to draw up another length unit, Li Shimin's face suddenly sank. It's just that when I heard his next explanation that it was not a change, but a few additional uses, and the scope of application was limited to King Han's mansion, it was considered to be eased.

If you don't leave the palace, it will naturally have no impact.

It's just that the emperor was still quite puzzled by Li Yuanjia's plan, and frowned: "Eleven Lang, is it necessary for you to do these things?" ”

"Second brother, of course it's necessary!"

Blinking, Li Yuanjia hurriedly smiled: "If you add a few, it will be more convenient to use, especially some very fine things, which are very needed when manufacturing." ”

In fact, if you have to use the old one, Li Yuanjia also has ready-made things.

For example, in his collection of a book of "Sun Tzu's Sutra", there is a saying that "silkworms spin silk for suddenly, ten for a thread, ten silk for a millimeter, ten millimeters for a yak, ten yak for a minute, ten inches for an inch, ten inches for a foot, ten feet for a zhang, ten zhang for a lead, fifty for one end, forty feet for a horse, six feet for a step, two hundred and forty steps for an acre, three hundred steps for a mile", but it is too impractical, at least the current technical level is not very practical.

That's why Li Yuanjia wants to build a new set according to his own habits.

For this reason, he thought of coming to Li Shimin to ask for a standard ruler, and then further expand it according to the standard ruler, and uniformly manufacture rulers, angle rulers and vernier calipers for craftsmen...... Speaking of vernier calipers, until now Li Yuanjia still remembers the feeling when he saw a copper vernier caliper in the eighth year of Zhenguan, and he panicked, thinking that there were already predecessors in the Han Dynasty......

Although he didn't understand it too much, the emperor also knew something about his younger brother now, and knew that he must have some strange ideas, so he shook his head and didn't care about him anymore. And rewarding a ruler and allowing Han Wangfu to use some length for his own use is naturally a wave of his hand for Li Yuanjia to let go and do it.

However, Li Yuanjia was satisfied, but Li Shimin then asked: "Eleven Lang, when will your overturning workshop start?" It won't wait until a year from now, will it? ”

"No, of course not!"

Blinking his eyes, Li Yuanjia said categorically: "I will let them start production first next month, and it must not be delayed!" Merely...... In the beginning, I must give them some tools to use earlier, and then teach them how to make a dump, so I can only let them learn from the carpenter in my house first. ”

Li Yuanjia believed that the emperor could understand these words.

It's really not that Li Yuanjia looks down on carpenters in this year, there are really very few people at the level of Chen Mu, most people can make some simple farm tools, utensils or something, if they can make complex tools like overturning, this thing has not been popularized for a long time?

But in fact, it was very difficult for Li Yuanjia to find a carpenter who could build a rollover car in Luzhou.

This is like the vernier caliper he once saw, obviously there were already people in the Han Dynasty who could make this kind of fine measuring tool, but two thousand years later, the invention right of that thing went to the Europeans!

So after seeing more, Li Yuanjia also figured it out.

Just like Chinese medicine more than a thousand years later, the level of the top hospitals and doctors can indeed catch up with or approach the world-class level, but if the national level is average, it will be miserable, and it is not in the same world as other developed countries!

The carpenter of the royal family, that is also the carpenter of the twelfth year of Zhenguan!

Just by virtue of their ability to barely read a single word, what will the teacher do, what will they do, and if they want to come up, they will make a rollover?

Don't be funny!

"Hmm...... Just do it. ”

After listening to his younger brother's words, Li Shimin nodded clearly.

If a rollover could be as simple as a zigzag plough that an ordinary carpenter could make, why would he give this boy fifty carpenters and make him hand over two hundred and fifty planes a month? Wouldn't it be better to just send the drawings down?

Thinking of the overturn, Li Shimin thought of the piece just now, and suddenly his mood became a little irritable.

So after a while, the emperor simply changed the topic: "By the way, Eleven Lang, just leave these trivial matters to the subordinates to do, your wedding is imminent, and other things can be put aside for the time being." ”

"Yes, second brother."

Seeing that the emperor was involved in his marriage again, Li Yuanjia's eyelids jumped, and he nodded hurriedly.

He knew that the marriage between the Han Wangfu and the Liang Guogong Mansion was not only a lifelong event, but also very important to Li Shimin. After all, although the man Li Yuanjia is a prince, the woman's father is Fang Xuanling, one of the most important ministers in the Zhenguan period, and one of Li Shimin's most trusted prime ministers.

Therefore, this marriage is also a manifestation of the intimate relationship between the royal family and the Fang family.

Coupled with the marriage of Li Shimin's daughter Gao Yang and Fang Yiai, it can be said that the emperor really put a lot of thought into it for the sake of this Fang Xianggong. In this case, the wedding is naturally particularly important.

So thinking of his wedding in May, Li Yuanjia also had mixed feelings in his heart.

The Fang family is very good, and considering that Li Yuanjia will become the son-in-law of the Fang family, it is impossible to say that Fang Xuanling can live for a few more years or even more than ten years, at least Zhenguan will definitely not decline; Fang Fengzhu is no problem, the person is very beautiful, and the personality seems to be good, no matter how you look at it, it is a good match.

But......

After seeing him at least once, Li Yuanjia didn't feel much.

But think about it, a sixteen or seventeen-year-old girl, and a girl from the Tang Dynasty, how can she make Li Yuanjia's heart move? Just by virtue of her figure, appearance and family background?

At least here in Li Yuanjia, there is no possibility of love at first sight.

"The only hope is to cultivate a relationship after marriage."

After coming out of the palace and returning to his study, Li Yuanjia couldn't think of another way, so he could only think of a long sigh and a wry smile.

In addition, he looked around and looked at the rows of bookshelves in his study, and he exhaled helplessly: "Before the wedding, these books must also be sorted out, and some books that can't be seen by her must be dealt with quickly......"