Su Bai took a sip of tea and continued to draw patterns with a pencil. The construction of the city wall must be very rigorous.

Therefore, the design drawings and analysis drawings must be particularly clear, so that those who build them can understand them.

He first ran out of a general area of ​​the Yanlong tribe, and then drew a deep ravine around it.

This deep ravine is the same depth and width.

After I finished drawing the ravine picture, I took out another picture and continued painting, because what the primitive tribesmen wanted was simplicity and clarity.

If you express everything you want to express in one picture, they won't understand it.

You must draw one step on one piece of paper, and then draw the overall steps on several pieces of paper.

In this way, when you show them the design drawings, they will see it more clearly, and they will not be at a loss when the time comes and may even come over to ask.

"The depth of this ravine must be deep so that the city wall built will be stable."Su Bai murmured to himself.

He still knew a little about these things. He had read a lot of books and videos about history on the earth.

So this time he traveled through time so that he wouldn't know anything, and he didn't have to sit down. Eat and wait to die, you can all rely on yourself

"The next step is to choose the stone. It must be a harder stone, so that it will not be easily broken."Su Bai thought as he shook his quill.

There is a difference between stones. Some stones are very hard, but some are brittle.

Brittle means that it will break into several pieces after being dropped a few times. This kind of stone It is very unstable when used to build city walls.

As long as a stronger beast can knock a gap into the city wall in a few blows, it is too dangerous.

"Xiao Yu, please ask Shan Shan to come over. I have something to ask him."Su Bai immediately raised his head.

Instead of thinking hard here, it would be faster to call a professional to ask.

Shan Shan is a famous stonemason in the tribe, so he must know something about this matter.

"yes."Yu Ying nodded immediately.

"Tap tap tap......"

Half an hour later, Shan Shan arrived at the second floor of Yong'an Building with the help of his apprentice, and was arranged to sit down on a stool.

This was his first time coming to Yong'an Building. He glanced around with surprised eyes, and the expression on his face was full of surprise.

Shan Shan quickly brushed away the dust on his body and deposited it all on his clothes, for fear of staining the place.

He retracted his thoughts, his face still covered with dust and asked:"Wu, is there anything you want me to do?"

He knew that Wu would not let anyone call him if it was no big deal, and he still came to Yong'an Building.

"Take a look at this first, and then I’ll tell you about it."Su Bai handed over the pieces of paper.

"good." Shan Shan's calloused hands took the pieces of paper and began to browse.

Su Bai was quietly drinking tea on the side, observing what kind of expression the other party would make.

Ten minutes later, Shan Shan's His expression became more and more serious, and he almost put the paper in front of his eyes.

He put down the pieces of paper and asked in surprise:"Is Wu planning to replace the wooden wall with a stone wall?"

As he is experienced, he naturally knows what is drawn on the paper. The reason why he has been looking at it for so long is that he is not sure what the gullies are for.

Could it be a trap drawn by others who will have to avoid it if they want to get close to the Yanlong tribe in the future? These traps?

But this doesn’t make sense. If it’s a trap, what will the people of the Yanlong tribe do? They also have to go out.

"Well, I want to replace all the wooden walls with stone walls, this wall is called a city wall."Su Bai said word by word.

He knew that Shan Shan, a stonemason, would be able to understand it. As expected, the result did not disappoint him.

"Wu, I wonder how high you want to build this city wall?"The hill asked, suppressing the question just now.

"It is twenty feet high and nine feet wide, which means the height must be seven meters and the width must be three meters, enough for four people to walk side by side."Su Bai explained.

It was originally about feet, but after thinking about it, they didn't quite understand. Anyway, we developed measuring tools for them during the rainy season and taught them the units of measurement. At this time, just tell them meters. , but I don’t understand what it means to say a ruler.

Shanshan suddenly understood after hearing this, and looked at the drawing in his hand, and said excitedly:"Wu, if you build the city wall according to these values, you will have to dig a deep trench to stabilize it. The upper part of the city wall, so......"

He excitedly pointed at the ravine on the drawing. Only then did he understand the meaning of the ravine.

"Um."Su Bai smiled and nodded. As expected, professional people can understand everything without saying anything.

"This trench needs to be wider. I think this can better stabilize such a high stone wall."

Shanshan frowned and thought, and continued:"Wu, in this case, it will take a while just to dig this trench, and it will also require a lot of manpower."

"I will definitely dig such a deep trench before the next eternal night."The hill continued before waiting for an answer.

"But this trench cannot stop the attack of the vicious beast."Su Bai put down the tea cup in his hand.

"Because of this, if the city walls are all built with stone, it will take longer. I think if it is only used to resist those ferocious beasts, there is no need to build it so high. Shan

Shan thought seriously and continued:"The height and width can be reduced, and then give me more hands. I can guarantee that all this will be completed before the arrival of eternal night.""

His expression became extremely serious. After all, this is an issue related to the safety of the Yanlong tribe.

"No, Wu, we have forgotten one of the biggest problems, and that is the problem of the rainy season. If we cannot build it when the rainy season comes, then digging this trench will be in vain. Shan

Shan paused and said with a serious expression:"After a long period of soaking in the rainy season, this trench is basically useless. I suggest waiting until after the rainy season to carry out this work.""

Su Bai shook his head, feeling that this was not a very good suggestion, and asked:"If you reduce both the height and width as you said, how long will it take?"

"If this is the case, it will only take more than thirty days to dig the trench."The hill said immediately

"Just do what you said. The trench must be dug before the rainy season. The wall must also be built at the same time. No matter what, the trench must be filled up."Su Bai ordered

"clear."The hill nodded..........................................

"Second update, please support and customize."

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