There are ice cubes, there is ice cream.

Although this summer is hot, it is more comfortable than usual.

After swimming in the swimming pool of Guanshishan Academy for half an hour, Li Kuan was comfortably lying on the recliner next to him.

originally wanted to bring Cheng Jingwen over, but she refused to live or die.

There was no way, Li Kuan's idea of trying something new in the water died in the bud before he could act.

"Lord Wang, according to the method you said, Gewu Academy has sorted out and produced a new set of measuring instruments, and it is now placed in the Gewu Building."

Li Kuan came to Guanshishan Academy, and Xu Jingzong would be waiting in front of him no matter what he was busy with.

"Oh, is it alright? Let's take a look. ”

Datang's unit of measurement, whether it is length or weight, is a bit messy, and it lacks a set of standards recognized by the world, which makes Li Kuan very unaccustomed.

In the past, if you don't get used to it, you won't get used to it, and the impact is not very big.

However, with the continuous development of various workshops, especially after the promotion of assembly line operations in various workshops, there are more parts scrapped because of substandard quality.

One of the root causes is the irrationality of the measurement system.

Therefore, Li Kuan directly took out the set of measurement units in later generations.

As for the standards of each unit, such as how long a meter is and how much a kilogram weighs, he handed it over to the students of Gewu Academy.

"His Royal Highness the King of Chu, this is the standard of one meter."

When Li Kuan came to the Gewu Building, Li Yan was already waiting there.

It seems that Xu Jingzong arranged it in advance before looking for Li Kuan.

"It looks okay, but it's a good choice to make a meter ruler out of gold."

When Li Kuan first explained the length of the meter, he roughly described it and said that he would die about 1.75 meters.

Although Xu Jingzong and Li Yan didn't understand why Li Kuan defined rice so much at the time, they basically made a meter ruler according to this standard.

Without a spectrum and without lasers, it would be impossible to define a meter as accurately as it did in later generations.

Rather than this, it is better to artificially create a standard of meters, and in the future, everyone will make various meters and other length measuring instruments according to this standard.

"Lord Wang, according to this meter standard, the academy has made various one-meter rulers, which can be distributed to various workshops at any time and promoted to the outside world."

Xu Jingzong is still very reliable, and he has already done everything Li Kuan wants to do in advance.

"His Royal Highness the King of Chu, the meter ruler has been made, but we still have a problem, such as decimeters, centimeters, and even millimeters, we can show it more accurately, but the microns ...... We haven't discussed how to measure it yet. ”

Li Yan has one thing to say, two to say two, and he has also said what he didn't do well.

"It's okay to do this later, but Ben Wang has an idea, one micron is too small to measure, but we can think about how to measure a hundred microns first. This ruler cannot be measured directly, so we can consider whether to add a movable ruler to the ruler to assist, and improve the measurement accuracy through the combination of the two. ”

Although Li Kuan has used vernier calipers, he has almost forgotten its measurement principle, so he can only simply give Li Yan some reminders to see when they can get the vernier calipers out.

In that case, the measurement accuracy can be improved by at least one unit level, which means that it is very significant.

Immediately afterwards, Li Kuan looked at the actual weight, capacity and other measurement tools, and put forward some suggestions for improvement.

Then he took this set of things and went to Daming Palace.

"Kuan'er, you came to me today, just for these things?"

Li Shimin was a little surprised when he heard Li Kuan's intention.

Li Kuan has always belonged to the kind of person who does not go to the Three Treasures Hall for nothing, and the number of times he took the initiative to find Li Shimin was very rare.

And once you find it, it is often not a trivial matter.

"The book is the same text, the car is the same track, and the line is the same. Although Qin Shi Huang unified the unit of measurement, writing, and etiquette very early, the standards of length and weight in various dynasties were still very vague. For example, one foot, whether it is the Qin and Han dynasties or the Three Kingdoms Wei and Jin, or the former Sui and my Tang Dynasty, they are not completely consistent, which will lead to a lot of problems. ”

Seeing that Li Shimin obviously did not fully realize the significance of this thing he made, Li Kuan had no choice but to explain.

"What's the problem? Aren't these handfuls all good for a hundred years? ”

Li Shimin's point of view basically represents everyone's point of view.

Of course, don't think that the ninth-rate craftsmen agree with this point of view, no one cares.

Craftsmen are the group of people who have the deepest understanding of the importance of a unified unit of measurement.

"Your Majesty, my Tang Dynasty is far superior to the Qin Emperor and Han Wu, there was no problem before, it doesn't mean that there is no problem now."

Li Kuan slapped a sycophant lightly, and Li Shimin couldn't help but secretly rejoice in his heart when he heard it.

"I've not done enough, Kuan'er, you're a bit too much."

Li Kuan: ......

Lao Li? Your smile has betrayed your true thoughts.

"Your Majesty, it is not an exaggeration at all. For example, which dynasty can compare to the cement road from Chang'an City to Liangzhou, and from Chang'an City to Luoyang? For another example, Chang'an City alone has a population of more than one million, which is also a height that has not been reached in the Qin and Han dynasties. ”

"That being said, but what does all this have to do with your unit of measurement? Everyone is accustomed to various units of measurement such as inches, rulers, and zhangs, and it always feels strange that you change it to meters, decimeters, and millimeters. ”

Li Shimin was in a very good mood and took the initiative to ask Li Kuan about the specific details.

"The biggest problem is that the current units of measurement are too arbitrary, not rigorous enough, and the standards are not completely consistent across the country. Weichen gave an example, take the four-wheeled carriage in Chang'an City as an example, His Majesty must also know something, it was produced by the workshop in the Erchen Mansion. ”

"This four-wheeled carriage, the various components involved, there will be about one or two hundred when disassembled. In the past, craftsmen were basically responsible for making their own carriages, and when they were finished, if one of the components of the carriage was broken, it had to be made separately according to the dimensions of the two carriages before it could be repaired. ”

"Isn't that normal? If you don't make components separately, how can you repair them? ”

Although Li Shimin knew that the carriage workshop in the Chu Wangfu was producing quickly, he had not seen the assembly line production method.

"Your Majesty, the carriage workshop in the Weichen Mansion is now arranging a number of special craftsmen to make each component, and it is extremely sure that the size of the components produced is exactly the same. And when assembling, it is also assembled by specialized people, and the speed is very fast. Once a component is broken, you can pick up the same one directly from the warehouse and replace it, saving time and effort. ”

As long as the carriage is broken, pull it back to the Mercedes-Benz carriage dealership, and it will not take half an hour to repair it, and the price is very cheap. That's the benefit of unifying the size. ”

"And to unify the size, the most important thing is to unify the measurement tools, otherwise, the same one-foot-long component, different people will make different things, then there is no substitution."

Li Shimin listened very carefully to Li Kuan's explanation, "I understand what you said, but do you need to mobilize the people so much to let the imperial court issue a formal decree?" ”

"Totally useful! Your Majesty, as more and more workshops were built inside and outside Chang'an City, the standardization of this unit of measurement became more and more important. If the unit of measurement is not uniform, it will be difficult for the same kind of things produced by each workshop to be exactly the same; If the unit of measurement is not unified, it is difficult to avoid the phenomenon of missing two catties; If the unit of measurement is not unified, then the development of Datang's various technology will be severely limited and inherited obstacles; If ......"

"Alright, I'm okay with what you're doing!"

Seeing that Li Kuan turned on the speaking mode, Li Shimin wisely chose to compromise.

Of course, this Li Kuan's achievements over the years are also inseparable.

The shadow of the name tree of man.

Until Li Kuan has brought Li Shimin the frustration of failure, this trust will become stronger and stronger.

"Thank you, Your Majesty! Wechen suggested that the Ministry of Household and the Ministry of Industry should first start to promote this unit of measurement. ”

"You can communicate with Xuan Ling yourself."

Li Shimin obviously didn't want to discuss this topic with Li Kuan.

"I heard that the envoys of the Tubo Kingdom have quietly left Beijing, do you know about this?"

"Huh? Is Lu Dongzan gone? ”

Li Kuan showed a harmless expression of humans and animals, and he looked very surprised.

However, who is Li Shimin?

When it comes to playing conspiracy, ten Li Kuan is not his opponent.

"I heard that Lu Dongzan was wandering around Chang'an City before leaving Beijing, and he was accidentally hit by a carriage."

When Li Shimin said the word "accidentally", his pronunciation obviously became a lot heavier, which made Li Kuan think that he had some evidence.

"Your Majesty, there are many carriages in this Chang'an City, and car accidents are inevitable. Although the situation is much better with the introduction of traffic rules, there is no way to avoid it completely. ”

Li Kuan avoided the heavy and light, pretending to be confused there.

This kind of thing, unless you come up with ironclad evidence, you can't admit it even if you are killed.

Especially in the matter of the Intelligence Investigation Bureau of the Chu Palace, it is better to keep a low profile as much as possible.

"Left and right are just a bunch of brutes, let's go."

Li Shimin saw that Li Kuan looked like a dead pig who was not afraid of boiling water, and he was a little unsure whether he had done it.

However, at this time, Li Shimin did not pay much attention to the Tubo State.

In his opinion, with this energy, it is better to care more about Xue Yantuo and Goguryeo.

"What Your Majesty said is, let's go."

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