Zhu Biao walked inside, only to see the officials and slaves coming and going, carrying coal and brass, or striking iron and pulling bellows under the guidance of blacksmiths.

Zhu Biao saw a few familiar faces in the official slaves, and it seemed that he had also been from the official tooth bureau, but he was not easy to ask.

Zhu Bai caught a glimpse of the surprise on Zhu Biao's face, but did not explain.

Among these official slaves, there are indeed people from the official tooth bureau, who are the group of tooth chiefs who Hu Guangcheng announced that the political secretary had arrested before, such as Chang Quan.

Originally, Zhu Bai wanted to send them back to the Tianwei Institute, but after thinking about it, these people knew too much.

If they talk nonsense to others, a lot of things will happen.

Anyway, it was going to take coolies here, and it was safe to close a wall, so I got them all here.

Now they are not afraid of any more knowledge, because no one here can get out.

Those who can come in are safe enough people.

They can't ask for it, although they work hard here, but the food and accommodation are very good. Compared to going to the guard station to do conscription, this place is already much better.

No matter how good the health is, it won't last more than a year.

Zhu Biao picked up a Yanling knife and looked at it carefully.

At this moment, he realized that there were fine patterns like small daisies on the surface of the knife, which looked as bright as a mirror.

Zhu Bai told Zhu Biao about the process of the Yanling knife.

All in all, it is a low-carbon steel with low hardness but good toughness on both sides, and a high-carbon steel with high hardness in the middle.

This Yanling knife looks simple, but it is actually very knowledgeable.

He is not good at talking to Zhu Biao in such detail.

After all, it's his trade secret.

The high-carbon steel in the middle is not simple, it is Uzi steel, using the forging method of "Damascus steel", wrought iron and carbon steel are mixed together and folded and forged, so it forms layers of finely defined dark lines. This particular pattern has a name called the Mohammed pattern.

The fine, dandelion-like pattern above is basically due to the mixing of two materials with different properties.

The bright area is hard steel, and the dark place is tough steel.

Not only is it beautiful, but it is also able to make the blade microscopicly invisible, and the serration is sharper than that of a flat blade.

There is an even more poisonous method, which is to feed poison to the blade, so that the blade will be as dark as the night sky, and the patterns all over it will be as beautiful as the stars.

Ancient craftsmen knew how to extract trace elements and add them to steel, and could judge empirically which region of iron ore could be used to make good steel and forge good weapons.

They traveled all over the world to find high-quality iron ore, and they smelted it in the mine, trying it piece by piece. It often takes several years or even more than ten years to produce a magic weapon.

He knew that silicon, manganese, sulfur, phosphorus, chromium, nickel, molybdenum and copper were added to it, and a certain amount of manganese ore powder and iron ore was added to a closed graphite clay crucible, melted into high-carbon molten steel, and then sprinkled with several other trace element ore powders after rolling fine sieves for forging.

And his official bureaus are all over the country, and as long as he can name the specific location of various minerals, someone can help him get them.

His sword was not only beautiful, but light and thin, and sharpened like clay, and his hair could be broken by blowing.

Moreover, there is no communication between the various crafts in the arsenal, and the craftsmen of each craft only have to do their own craft.

In this way, only Zhu Bai alone has mastered the essentials of weapon processing, and whoever wants to win the world in the future must rely on him.

There are also craftsmen in the market who are not convinced, and imitate the knife with the same length, thickness, width and narrowness, and it is impossible to see the difference just by looking at it, but as long as it touches the Yanling knife made by Zhu Bai, it will be broken immediately.

Therefore, the guard also gave up his own imitation thoughts, and obediently waited for his turn.

Zhu Biao was amazed and asked Zhu Bai: "Twelfth brother, how do you know about such a thing as fighting weapons?" ”

Zhu Bai smiled: "I don't know. I just hired a craftsman to play while pondering. Hit it out and let Hu Dafa try it. Hu Dafa took it in his hand and knew it. After the finished product is made, I will take it to the generals for trial and ask for their opinions. In fact, from the beginning to the final molding, we made dozens of versions. ”

Zhu Biao nodded slightly.

He pointed to the groove on Yanling's knife and said, "In the past, people thought that this was a blood groove, which was used to pierce and bleed. Not really. Because when you really go to the battlefield, no one will wait for bloodletting after stabbing in, but immediately pull it out and continue to fight. ”

It was the first time Zhu Biao had heard this talk about this, so he was very interested and asked, "Then what is this slot for?" ”

Zhu Bai smiled: "I didn't know before, but someone told me later that this is used to reduce weight." It's easy to bend if it's too thin, it's too thick and too heavy, so make it thick and then make this groove. ”

In this big house, the backyard makes goose feather knives, and the front yard makes handcuffs. There was originally a wall separating it from a small door. Now lock the door, and there are guards guarding it.

On weekdays, the front yard and the back yard are each in and out, and each enters and exits from their own doors.

At this time, seeing Zhu Bai and Zhu Biao coming, the guards hurriedly opened the door.

Compared with the clanging and blazing fire in the backyard, the front yard is very quiet.

Because the craftsmen are making very small parts.

In the past, when Zhu Bai made that "bicycle", the chain and marbles were very troublesome.

Now the parts made by these craftsmen are also very fine, and each person is given a cast iron mold, and the parts are ready to be put into the grooves. If there is a slight deviation, it will not be put in, and it must be polished or restarted.

These tasks require a lot of vision and patience, so the craftsmen in the front yard are mainly quiet and stable young and middle-aged people.

Too old and shaking hands and unable to see clearly, can only be responsible for assembly and guidance.

As in the front yard, there are several craftsmen in a group, and each group is only responsible for the processing or assembly of one part.

Zhu Bai picked up an assembled handcuff and asked Zhu Biao: "Big brother, do you want to try it?" ”

Zhu Biaoxin jumped twice.

Zhu Bai used this "artifact" to catch Deng Zhen who wanted to coerce him before.

In the Maoshan Station, Zhu Biao saw the power of this thing.

He wanted to give it a try for a long time, but Zhu Bai always said: "The safety of this has not been guaranteed, and I will talk about it after I improve it." ”

Unexpectedly, it took so long for him to really touch the handcuffs.

Zhu Biao took the handcuff.

It was heavy, heavier than he had imagined.

Zhu Bai pointed to the crosshair on the handcuff and the target on the tree: "In order to prevent the hand from shaking, it is best to hold the right hand with the left hand for the first time." If you feel that your eyes, crosshairs, and targets are three points and one line, you can shoot. ”

Zhu Biao aimed for a long time, fired a shot, and was shocked by the recoil.

Zhu Bai said: "The tiger's mouth hurts a little. This is already an improvement, and it was very hot before. ”

Zhu Biao walked over and looked at the target, which hit the side, a little off.

The marbles pass through the target and sink into the trunk of the tree.