There are ice cubes and ice cream.

Although this summer is hot, it is more comfortable than in previous years.

After swimming in the swimming pool of Guanshishan Academy for half an hour, Li Kuan lay down comfortably on the lounge chair next to him.

I originally wanted to drag Cheng Jingwen over, but she refused to do so.

No way, Li Kuan's idea of ​​trying something new in the water died in the bud before he took action.

"Your Majesty, according to the method you mentioned, Gewu Academy has compiled and produced a new set of measuring instruments, which are now placed in Gewu Building."

When Li Kuan arrived at Guanshishan Academy, Xu Jingzong would always wait on the car in front of him no matter what he was busy with.

"Oh, is it alright? Then let's go over and take a look."

The units of measurement in the Tang Dynasty, whether it was length or weight, were a bit confusing, and lacked a universally recognized standard, which made Li Kuan very uncomfortable.

In the past, if you were not used to it, you would not get used to it, and the impact was not very big.

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

One of the root causes is the unreasonable measurement system.

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

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

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

When Li Kuan arrived at Gewu Building, Li Yan was already waiting there.

It seems that Xu Jingzong made arrangements in advance before looking for Li Kuan.

"It looks okay. Making a meter stick out of gold would also be a good choice."

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

Although Xu Jingzong and Li Yan did not understand why Li Kuan defined rice in this way at the time, they still basically made meter rulers according to this standard.

Without spectrum or laser, it is simply impossible to define one meter as accurately as it will be in later generations.

Instead of doing this, it is better to artificially create a meter standard, and in the future everyone will use this standard to make various meter sticks and other length measuring instruments.

"Your Majesty, the academy has already produced various one-meter rulers based on this meter ruler standard, which can be distributed to various workshops at any time and promoted to the outside world."

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

"Your Highness King Chu, the meter ruler has been made, but we still have a problem. We can express decimeters, centimeters, and even millimeters more accurately, but the micrometers... we haven't discussed it yet.

How to measure.”

Li Yan actually said one thing and two things, and also pointed out the things he didn't do well.

"We can do this later, but I have an idea. One micron is too small to be measured, but we can first consider how to measure a hundred microns. This ruler cannot be directly measured, so we can consider

Instead of adding a movable ruler to the ruler for assistance, the measurement accuracy can be improved by combining the two."

Although Li Kuan had used a vernier caliper, he had almost forgotten its measurement principles. He could only give Li Yan and the others some reminders to see when they could come up with a vernier caliper.

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

Immediately afterwards, Li Kuan took a look at the actual weight, capacity and other measuring tools and put forward some suggestions for improvement.

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

"Kuan'er, why did you come to me today just for these things?"

Li Shimin felt a little surprised when he heard Li Kuan's purpose.

Li Kuan has always been the kind of person who never goes to the Three Treasures Hall for anything, and the number of times he takes the initiative to find Li Shimin is very rare.

And once you find it, it's usually not a trivial matter.

"Books have the same text, carriages have the same track, and travels have the same spirit. Although Qin Shihuang unified the units of measurement, writing, and etiquette very early, the standards for length and weight in various dynasties are still very vague. For example, one foot, whether it is Qin, Han or the Three Kingdoms

The Wei and Jin Dynasties, or the former Sui Dynasty and the Tang Dynasty, are not completely consistent, which will lead to many problems."

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

"What's the problem? Aren't these handfuls good for hundreds of years?"

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

Of course, don't think that no one cares whether low-level craftsmen agree with this point of view.

But craftsmen are the group of people who have the deepest understanding of the importance of unified units of measurement.

"Your Majesty, the national power of the Tang Dynasty is far greater than that of Emperor Qin and Han Dynasty. There were no problems before, but that doesn't mean there are no problems now."

Li Kuan flattered him gently, and Li Shimin couldn't help but feel secretly happy after hearing this.

"I still haven't done enough, Kuan'er, what you said is a bit too much."

Li Kuan:……

Lao Li? Your smile has betrayed your true thoughts.

"Your Majesty, that's not an exaggeration at all. Just give me a random example, the cement road from Chang'an City to Liangzhou, and the cement road from Chang'an City to Luoyang. Which dynasty can compare with it? For another example, Chang'an City alone has a population of more than one hundred.

Ten thousand, this is a height never reached during the Qin and Han Dynasties."

"That's what I said, but what does this have to do with your measurement unit? Everyone is used to using various measurement units such as inches, feet, feet, etc. Now you change it to meters, decimeters, millimeters, it always feels weird

weird."

Li Shimin was in a good mood and proactively asked Li Kuan for specific details.

"The current units of measurement are too arbitrary and not rigorous enough, and the standards in different places are not completely consistent. This is the biggest problem. Wei Chen gave me an example, take the four-wheeled carriage in Chang'an City. His Majesty must also be aware of it.

Yes, it was produced in the workshop of Erchen's house."

"This four-wheel carriage involves about one or two hundred components when disassembled. In the past, craftsmen were basically responsible for making their own carriages. After completion, once a certain part of the carriage

If the components are broken, they can only be repaired by making them separately according to the dimensions of the two carriages."

"Isn't this normal? How can you repair it if you don't make the components separately?"

Although Li Shimin knew that the horse-drawn carriage workshop in the Chu Palace produced very quickly, he had not seen the assembly line production method.

"Your Majesty, the carriage workshop in Weichen Mansion now arranges several specialized craftsmen to make each component to ensure that the dimensions of the components produced are exactly the same. And when assembled, they are also done by specialized people.

It's very fast to assemble. Once a component breaks, you can just get an identical one from the warehouse and replace it, saving time and effort."

"The coachmen who have bought four-wheeled carriages in Chang'an City should have the deepest experience of this. Once the carriage breaks down, take it back to the Mercedes-Benz carriage shop and it will be repaired in less than half an hour, and the price is very cheap. This is the unification of sizes.

the benefits of."

"To unify the sizes, the most important thing is to unify the measurement tools. Otherwise, the same one-foot-long component will be made differently by different people, and there will be no replaceability."

Li Shimin listened to Li Kuan's explanation attentively, "I understand what you said, but is it necessary to mobilize troops and mobilize people like this and ask the court to issue a formal decree?"

"It's completely useful! Your Majesty, as more and more workshops are built inside and outside Chang'an City, the standardization of measurement units becomes more and more important. If the measurement units are not unified, the same type of products produced by each workshop will

It is difficult to make things exactly the same; if the units of measurement are not unified, it is difficult to avoid the phenomenon of missing a few pounds; if the units of measurement are not unified, then the development of various crafts and technologies in Datang will be severely restricted and

Obstacles to inheritance; if..."

"Okay, I agree with your approach!"

Seeing Li Kuan start speaking mode, Li Shimin wisely chose to compromise.

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

The shadow of the famous tree.

This trust will become stronger and stronger before Li Kuan brings the frustration of failure to Li Shimin.

"Thank you, Your Majesty! Wei Chen suggested that the Ministry of Household Affairs and the Ministry of Industry should start promoting this unit of measurement."

"You should talk to Xuan Ling yourself about this."

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

"I heard that the Tubo envoy left Beijing quietly. Do you know about this?"

"Ah? Has Lu Dongzan left?"

Li Kuan showed a harmless expression, as if I was surprised.

But who is Li Shimin?

When it comes to intrigues, ten Li Kuans are no match for him.

"I heard that before Lu Dongzan left the capital, he wandered around Chang'an City and was accidentally hit by a carriage."

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

"Your Majesty, there are too many carriages in Chang'an, so car accidents are inevitable. Although the situation has improved a lot after the introduction of traffic regulations, there is no way to completely avoid it."

Li Kuan avoided the important and took the easy, pretending to be confused.

Unless you come up with irrefutable proof of something like this, you won't be able to admit it even to death.

Especially with regard to the Intelligence and Investigation Bureau of Prince Chu's Mansion, it is best to keep a low profile as much as possible.

"The left and right are just a bunch of barbarians, let's just leave."

Li Shimin saw that Li Kuan looked like a dead pig and 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 Kingdom.

In his opinion, if he had this energy, he might as well pay more attention to the affairs of Xue Yantuo and Goguryeo.
Chapter completed!