Sun Ce clenched his fists tightly, as if he was going to go immediately and Xu Chu was beaten to death.

Lu Bu turned his head and looked at him: "What is Bo Fu doing?"

"Cao Cao is abominable, trying to harm our family." Sun Ce said: "It's a pity that he is in Xudu and will not be able to do anything to him for a while. Xu Chu came to the rule of the Chu Marquis and took him to vent his anger. We have to let Cao Cao see if he dares to send someone to intercept our family, so we dare to kill his people."

"But I have ordered Zilong and Ziyi to let Xu Chu go and not to fight with him." Lu Bu smiled calmly.

Sun Ce asked in surprise: "Half Chu let Xu Chu go?"

"Xu Chu is not an incompetent person, and it is not easy to kill him." Lu Bu said: "Either Zilong or Ziyi can deal with him, but if he wants to leave, even if the two of them work together to chase him, he will still let him escape. No matter what, it is impossible to keep him. It is better to do personal favors and let him go."

"That's right, but I still feel that I shouldn't let it go. At least I have to try it. If I really capture it, I can give Cao Cao a warning." Sun Ce said with a bad face: "Horse Chu should have asked me to go too."

"I have sent two powerful generals to protect my family, so why send you more?" Lu Bu replied: "I also need to hire people around me. When they arrive in Jianye, they have to return immediately. There is no need to let you go."

"But I was a little unwilling to let Xu Chu go." Sun Ce clenched his fists with a bad look.

"It is not easy to capture him. Instead of trying hard to find a way to capture him, it is better to let him go." Lu Bu said: "Xu Chu is a person around Cao Cao. If we kill him, we will give Cao Cao an excuse to send troops. But if we don't kill him and let him go back without any obstacles, Cao Cao gave us a verbal statement, but it is not easy to openly repay the grudge with kindness, so we can only endure it for the time being."

Continuing to move forward, Lu Bu continued: "Although we have long received the news that Cao Cao will join forces with Yuan Shao to send troops to Xuzhou, we are not ready yet. For us, having more time to prepare is far more important than capturing a Xu Chu."

Following Lu Bu, Sun Ce didn't say much.

Although he was unwilling to accept it, he also felt that what Lu Bu said was indeed correct.

If Xu Chu is captured, Cao Cao will definitely launch a large number of troops, and the battle in Xuzhou will begin before sufficient preparations are made.

When he was about to reach the door of the room where Lu Bu lived, Sun Ce asked: "While Chu said that he had to be well prepared, why did he still have to come to the coal mine and spend time here?"

"It took time?" Lu Bu, who was about to enter the door, turned around: "Bo Fu thinks it took time for me to be here?"

Sun Ce nodded: "In my opinion, the most important thing now is to rectify the troops and prepare to fight Cao Cao and Yuan Shao. Not only did the Chu Hou not do that, but he also came to the coal mine in person to do things that were useless for war. Although the lives of the craftsmen in the mine are important, they are also important in the entire Xuzhou and Yangzhou."

"I don't have to do it for the preparations for war," Lu Bu said: "Before the war, what we have to do is nothing more than military rations, armies and soldiers' training. People are doing these things. Do I have to stay there in person? If I prepare these every day, how could Cao Cao and Yuan Shao not know that I was preparing for war? Let others do it and do something for the craftsmen, which can numb them and give us enough preparations to win time."

Turning around and walking into the room, he instructed Sun Ce: "When I finish talking to the blacksmith, I will find two soldiers to come and burn water for me."

Since following Lu Bu, Sun Ce has increasingly believed that his work must be justified. He agreed and personally took several guards to guard the door.

Walking into the room, Lu Bu picked up a picture on the table.

The picture shows several cylinders, the longest one is obviously fully assembled, and the one that is disassembled into several pieces is the splicing structure of the entire large cylinder.

When the craftsmen were still making fans, Lu Bu had already started designing this drawing.

The so-called hydraulic support means that the support itself is not solid and has relatively light weight.

When you need to use it to support the top plate, pour water into the hollow cylinder and push up the bracket with the pressure of water to achieve a support effect.

The hydraulic support is indeed convenient to use, but the problem Lu Bu wants to solve is not just making it.

After building the bracket, he still needs to consider how to inject water into it.

After two thousand years, there is a high-pressure water pipe, and the bracket can be pushed up by the water pressure.

It is not that convenient in this era.

It is impossible to develop a tap water system for several hydraulic brackets.

When using a water bucket to pour water into the hydraulic support, what Lu Bu wants to solve is to push the support up when the water pressure is not strong enough.

So his design opened a hole on the edge of the main bracket.

Through this port, water can be poured into the cylinder.

When not in use, just unscrew the water drain valve and the bracket will return to the form of no water injected.

After carefully checking the design drawings of the hydraulic support, Lu Bu felt that there should be no problem.

Sun Ce's voice came from outside the door: "Horse Chu, the coal mine manager brought the craftsmen over."

He had already checked the pattern over and over again and thought there was no problem, Lu Bu ordered outside the door: "Please come in."

Sun Ce led the manager and two craftsmen in.

The craftsman stood behind the manager with his head down, and the manager bowed to Lu Bu and gave a big gift: "I have brought the person that the Chu Hou wants."

Looking at the two craftsmen, Lu Bu asked, "Are they all blacksmiths?"

"Reply to the words of Chu Hou, he is the blacksmith with the best skills in the mining industry." The manager replied.

"Look at this picture, can you create the above thing?" Lu Bu picked up the picture.

The manager stepped forward, took it with both hands, retreated to the two blacksmiths, and handed them the picture.

After taking the drawings, the two blacksmiths looked at them for a while.

One of them asked in surprise: "Dare you ask the Lord Chu, is there one of the pillars on the picture that is not hollow?"

"Did you understand?" Lu Bu smiled slightly and said to the two of them: "Not one, but everything is hollow."

"It's not easy to deal with if you are hollow." said the blacksmith: "Using our ability to create a hollow iron pillar..."

"It's not an iron pillar, but a steel pillar." Lu Bu interrupted him: "What I want is not only solid, but also not easy to rust. But it must be filled with water and placed under the mine. If it is rusted, how can it support the roof?"

Both blacksmiths have inherited their skills since childhood and have been scrambling irons for many years. They have never heard that iron tools will not rust.

He looked at each other with a surprised look on his face, and another blacksmith asked, "Half Chu heard of any iron tools that will not rust?"

"Of course there is." Lu Bu said: "As long as you add some other things, you can always create them."

He only knew that there was a kind of steel in the world called stainless steel, but Lu Bu didn't know the ingredients. He simply stole the problem and handed over the task of not rusting the iron tool to the blacksmith.

Although the iron smelting process in the late Eastern Han Dynasty had matured, it was impossible for the blacksmith to know what method to prevent the steel from rusting.

The two blacksmiths were in a dilemma. They both thought it was an impossible task, but they did not dare to directly deny Lu Bu's statement.

"Leave the hydraulic support to you to create. As for the materials you use, you can think about it yourself." Lu Bu waved his hand: "Go down first."

With the existing iron-smashing technology, it is no longer easy to build the brackets required by Lu Bu.

In addition, we have to figure out how to prevent the iron from rusting easily. The two blacksmiths were full of bitterness and didn't know where to pour it.

However, Lu Bu's order had been issued, and they did not dare to disobey, so they had to respond.

*********************************************

The manager left with the blacksmith, and Lu Bu ordered Sun Ce to find two guards responsible for boiling water for him.

Sun Ce greeted two guards into the house.

The guard was burning water in the room, while Lu Bu took out some animal fat from the box.

In addition to grease and some things like vanilla, Lu Bu took out a small jar of white powder.

"What is Chu Hou doing?" Seeing him take out these things, Sun Ce asked in confusion.

"The craftsmen came up from the well and used to take a bath are all green salt." Lu Bu said: "Although green salt can remove filth, it will make people feel very unhappy when applied to them. I plan to create something for them that can be used to remove filth and will not make people feel uncomfortable when applied to them."

He has long been used to Lu Bu creating novel things, and Sun Ce has no doubts about his success.

But he didn't understand how to remove filth with animal fat.

Lu Bu poured some white powder into larger jars.

He was doing this, and Sun Ce finally couldn't help but ask in confusion: "Does Chu Hou plan to use oil to make something that can remove filth?"

"Or what?" Lu Bu looked up and grinned at him.

"I only know that it will be even more dirty when applied to the body. I really can't figure out how to use them to remove the filth." Sun Ce shook his head: "Or how about Chu Hou using other things to try..."

"I haven't tried the grease yet, how can I easily change other things?" Lu Bu didn't explain much to him and continued to fiddle with the things in his hand.

Without asking anything from Lu Bu, Sun Ce could only look at him with a confused look on his face.

Two guards lit the carbon stove, and the carbon fire in the stove burned red.

Since the coal mines were found, coal has been used in fireworks everywhere in Xuzhou.

Lu Bu also designed a stove specially used for burning charcoal.

This kind of furnace is not only convenient to improve, but also can control the size of the furnace by blocking the air outlet below the furnace, which is much more convenient than the stove used to burn wood in the past.

The guard carried the stove into the room, and Lu Bu had already prepared the materials in the clay pot according to the proportion.

He handed the pot to the guard, and Lu Bu ordered: "Put the water and melt everything inside."

One of the guards took the pot and placed it on the stove.

Lu Bu turned his head and looked at Sun Ce standing next to him. Seeing that he was still confused, he asked with a smile: "Did Bo Fu not understand why I want to use grease to make decontamination things?"

There was always this doubt in my heart, and Sun Ce nodded quickly.

"The reason is actually very simple." Lu Bu wanted to explain to Sun Ce, saying that the oil is weakly acidic. He used alkali powder as a neutralizer to remove the weak acidicity and convert it into another substance. However, this explanation not only did not make Sun Ce understand, but it would make him even more confused. So he changed the statement: "If it was just oil, even if it melted and solidified again, it would still be oil. When heating the oil, I mixed alkali in it. After burning it with alkali, the oil would not be so greasy anymore, and it might be used to clean the dirt."

Lu Bu tried his best to describe it in words that Sun Ce could understand, but Sun Ce was still confused and couldn't understand why grease and alkali were heated together, so the things made could be used to clean dirt.

"Do you still don't understand?" Seeing that Sun Ce was still confused, Lu Bu asked him,

"Marquis Chu understood what he said, but I still heard the clouds and mountains and mists." Sun Ce grinned awkwardly: "It's nothing if I can't understand. If I can understand it, wouldn't I be able to create some strange things at any time like Mr. Chu?"

"Let's see after I've made it later." Although Lu Bu knew the general production process, he could not guarantee that he would succeed.

Two guards were guarding the stove, heating the pot full of ingredients.
To be continued...