The news that the saint personally welcomed Persian envoys into the city was the biggest topic of talk in the streets and alleys of Luoyang in September.

Give enough face and courtesy, so that everyone in the world knows the saints attach importance to new learning.

At this moment, the business bookstore under the Ministry of Internal Affairs was booming, and all kinds of math books were almost shorted. Some scholars who consciously could not compete with others in the way of articles also shook their persistence in their hearts, thinking about trying to get into agricultural science and technology

It may be considered a subject, but there is only one and a half years left, so I don’t know if it’s time to do it.

There are also some builders in Beijing who are paying attention to the arrival of Persian scholars.

The last time was the arrival of Master Mani thirty years ago. Later, he compiled a book called "Geometry" and won the Xia Wang Award. After several revisions, it was finally finalized and became a compulsory textbook for mathematics students, and most of the test questions came from it.

The construction engineer should also learn this book, and it is the key point among the key points.

After learning, combined with the knowledge of "Mechanics" - to be honest, the content of this book is still relatively crude - the constructionists have completely entered a new realm.

On September 30, at the request of the saint, Persian Bardia gave a lecture at the Imperial College in Dongdu and mentioned the theory of "arc triangle potential" (spherical triangle).

In addition to mathematics students, there are also a large number of bachelors in the field of construction.

The effect was very sensational.

Mathematics students are intoxicated by updating and more systematic knowledge.

Construction students have seen the possibility of application in architecture.

The biggest problem facing the arch and dome structure is the problem of side thrust.

If you just build a small arch or small tomb, you can completely rely on thick walls or earth to offset the side thrust. For example, in the arched structure of the Zhaozhou Dashi Bridge, it relies on the riverbank land to offset the side thrust and prevent it from collapsing.

But this is too costly. Is there a way to subtly reduce or even offset the lateral thrust through mathematical and mechanical design?

Of course there are, which involves advanced mathematical principles such as spherical triangles.

Overall, the lecture was very successful, but there were some small episodes.

Some of the Ministry of Works that built Luoyang Palace City will serve as supervisors, and the old craftsmen of the Shaofu Supervisor will come to listen. This Valdia is also very rude. He believes that the small house designed and built through mathematics and mechanics knowledge, in essence,

None of them are greater than the magnificent building built with a large amount of manpower and material resources regardless of cost. He believes that the latter is exquisite and spectacular, but it is an existence without a brain or thought.

This is naturally a big offensive to people.

Since the Tang Dynasty, all parties have been suppressed and failed to follow the expedition. How powerful is the power of the Central Plains? Chang'an and Luoyang are huge in scale and magnificent, how could they be inferior to others?

Therefore, some people refuted the various design styles, materials and construction details stipulated in the "Enterprise and Repair Order" since the Tang Dynasty.

With the help of the translation, Baldia browsed it roughly.

Of course, it is impossible for him to finish it carefully in such a short time, so he can only take a quick look at it and get a rough idea.

Suddenly, he stopped translating, pointed to one of the pages, and asked, "Why must you use such a standard wood?"

That was the appendix to the "Enterprise and Repair Order" commonly used by the Tang and Xia dynasties. It generally talks about the specifications of the preparation materials. For example, a certain section stipulates that the bracket section is "fifteen minutes high and ten minutes wide" and that wood of this specification must be used.

After hearing this, the craftsmen found it difficult to answer. Because the ancestors passed down and stipulated that they should do this, how could they change it?

"The trees vary in size and thickness. If they all use this specification—" said Baldia.

"Material division." The translator said in Chinese.

Valdia roughly understands that "material division" means specifications, so she continued: "Everyone uses this kind of wood, the range of materials you choose is much smaller. Maybe you need to go to the forest far away to choose. Isn't this a waste?

?”

"I have a lot of land and resources in Daxia. I can just go to a few places and choose more. In the worst case, I will recruit soldiers and spend more money. Even if I log in from Guizhou and Jiangxi, I can transport it to you." A craftsman proudly said that he was a little proud.

He said: "The floating bridge in Heyang three cities is to log and make boats in Hongzhou, Jiangxi Province, and even if you are shipped on dry land, you have never seen it before?"

"Now Hongzhou can't build this ship anymore, so we have to go south to log wood." Someone whispered.

No one paid attention to him, everyone looked at Valdia.

"Waste does not require strict material division. We can use different specifications of materials through mathematical calculations during construction, which can reduce a lot of waste." Valdia repeated.

"All house structures are based on materials. It is clearly stated in the "Entermination of the Imperial Repair Order" and there is it on the first page." The craftsman shook his head and said, "You dare not use it in accordance with the provisions of the "Entermination Order"

What should I do if something happens to me?"

"I can't do anything if I do mathematical calculations." Valdia said confidently.

This is the difference in concepts.

Chinese craftsmen believe that the speed of using specific specifications of materials can be assembled and stacked buildings through regulations such as French. Because not only are various materials "materials", but even the regulations on houses are certain, which is equivalent to

Later generations of prefabricated materials and modular house construction have high efficiency and fast speed.

Bardia believes that this will cause huge waste.

Some materials may still be searched nearby, what if they are thick pillars? According to their wishes, they have to search in the southern forest thousands of miles away, and then transport them back after cutting them down.

What kind of transportation cost is this? Valdia dare not imagine it.

What’s worse is that the growth of trees is cycled. The wood is easily damaged and more susceptible to fire. At this consumption rate, sooner or later generations will not find enough wood to build the palace. To be more precise, the

People cannot find wood that meets the "material division" regulations of the palace.

What should I do?

He believes that it is possible to build a house through changes in designs, on-site mathematical calculations, and what materials are used.

As a column that supports weight, it is really not enough to not meet a certain specification, and there may be safety risks. But I can reduce the weight it needs to bear through design.

In Constantinople, Baghdad, Bukhara and other places, nobility never stipulates what length, width, and thickness materials must be used to build manors and castles. In fact, if you look at it, you can often find materials of different lengths.

Mixed use.

In order to ensure safety, the nobles hired mathematicians to perform a lot of mathematical calculations on site, creating and designing them at the same time - the general design was determined in advance, but the detailed design may not be necessary.

In short, it is similar to a house shape and structure that stipulates in advance and then modularly splicing with equally strictly specified materials.

Another is to use materials locally. If the materials do not meet the requirements, the designer analyzes the stress on the spot and performs mathematical calculations, which may change the design again.

The former is very fast, with sufficient materials and transported in place, and can be built for you in a short time.

The latter is slower, so it is normal for you to delay the construction period for decades. Some castles even require three generations of grandparents and grandchildren to build before they can be completed.

"And here, why is it required that the pillars have one, half a side foot?" Baldia asked after turning a page.

The side foot means inclination. A side foot, which looks about 1%, is specified in the construction method, but the reason is not explained.

"Laws are laws." Someone said.

This answer is obviously a bit perfunctory.

"If this is not the case, a house built with mortise and tenon is prone to collapse." This answer is a bit sincere.

"Why did it collapse?" asked Valdia.

Unable to answer.

"I've never been exposed to this design, but I looked at it and understood the reason." Baldia said: "This is actually using the roof to generate a thrust to stabilize the structure of the house. People who write this book may understand it.

, because he proposed this design, which is very effective, but why don’t you understand?”

The craftsman was speechless.

Will my ancestor really understand these things? Maybe.

He actually knew the use of side feet. After all, he was an old craftsman who had been working for half his life and had rich experience. But he didn't compete for this face just now because he suddenly remembered a question that had been bothering for a long time: the ancestors stipulated that one side feet were tilted, why was it a one?

?Half of one is OK? What about two?

This question has been lingering in my mind.

He had never done such a "rebellious" thing, creating a French rule that he leaned one side of his foot, and he did it strictly and never surpassed it in his life.

When I was young, I was curious enough and asked the master, but the master couldn't answer it, and the master never looked at this question in detail. Generations of people have passed on the experience of their ancestors and have come through this.

Sometimes, there will be a few amazing people who will appear, and then by chance, or be appreciated by big people and have a high status, they dare to explore these details and then modify and create the French style. However, such people seem to just give it a try.

"Finally, I'll ask another question." Valdia closed the French style and said, "If I change the roof to an arch, how do you choose the material?"

Everyone was silent.

This problem is obviously beyond the outline. Because the creation method is not written, the appearance of the houses in the book is stipulated, and even dozens or hundreds of buildings with different functions are listed, such as pavilions, towers, bridges, towers, etc.

One type has corresponding construction methods and selects the specifications of materials. But if the shape of the building is not within these hundreds of types, they will not be sure.

Perhaps, only the few people who are in prison have some confidence. They have been immersed in this way for their whole lives and have a very profound understanding of creating the style. They may break through the rut and be unique, but they are just

"Possible". At least when designing and building the Hehuan Hall, they retreated.

"On the way to Luoyang, I heard a saying, "Everything changes will never leave the sect." Baldia finally said: "Did you master the sect? If you don't master the sect, you won't change."

I have never been exposed to your architectural styles, nor have I designed them, but I have given me a few months to learn about it. I can design your traditional palace, but you can't design our palace because I

If you master the 'sect', I will change'."

*******

If the construction of Hehuan Hall had already made the construction team of building experts who used mathematical knowledge to design buildings faintly overwhelm traditional masters and craftsmen in their status, and they would not be very comfortable, then this time the Imperial College lecture was completely a kick.

The museum is of no way to give face at all.

After hearing this in the palace, Shao Shude laughed out loud.
To be continued...