The ghost well was damaged, and Sun Guan recalled Bai Changjue, only three months. In the past three months, Bai Changjue's footprints have spread all over the world, collecting clues, combing the context, not letting go of any suspicious places, and finally creating a slight possibility in the impossible, from not knowing anything about the Mingwu Heavenly Palace, to finding the activity track of the Mingwu Heavenly Palace, and being the first outsider to notice that they are about to do something to Wu County.

This extraordinary talent is no longer enough to describe it as smart!

However, Bai Changjue's purpose was to retrieve the stolen Three or Five Evil Female Sword, in order not to startle the snake, so that the turtle head that Mingwu Heavenly Palace had finally exposed was retracted again, and no one was informed of the information about Wu County.

What does it matter to him whether they live or die?

Danyu struggled to sit up, stiffly raised his right hand, and took out the poison from his mouth like a puppet puppet, his eyes showed a frightened and inexplicable look, as if his brain, hands and feet were no longer under his control, everything was so weird and bizarre.

"For ...... Why...... It's me? Danyu desperately wanted to escape from this terrifying atmosphere, sweat beads and raindrops on his forehead were intertwined, and his hoarse voice barely asked the words that had been in his heart for many days.

Four teams of people, why did you choose me?

Bai Changjue smiled, maybe it was just Danyu who felt him laughing, and the bewitching voice penetrated into his ears, and then exploded in the depths of his heart: "Because among so many people, you are the only one who is the most afraid of death!" ”

The ghosts of the Six Heavens have always been fearless of death, which is inevitable after religious brainwashing, but Danyu this person, although he is a ruthless person in the Mingwu Heavenly Palace, usually always admonishes others to rather die than be captured, and when it comes to the end, only he understands in his own heart that the word death is easier said than done, and it is more important than a thousand jun!

All the disguises fell like water, and in the face of completely suppressive absolute power, those who were greedy for life and afraid of death no longer had the faith and courage to fight against them. Danyu raised his head to the sky and wailed, completely collapsed, and bent down on the ground, like an ant crawling at the feet of an elephant, begging: "Don't kill me!" I say, I'll say everything! ”

"Lan Liuxiang, where is it now?"

Mingyu Mountain is full of lush forests, strange flowers are gorgeous, the turn of summer and autumn is the most beautiful season. Xu You hugged the ugly slave, and during the walk with He Weizuo Qingming and others, he talked and laughed, and then listened to the jokes made by the ugly slave's clear children's voice, which was very pleasant. At this moment, someone from Tiangongfang came to report, and Zu Yu asked Xu You to come over, saying that there was a major discovery.

"Oh?" Xu Youxiao said to He Wei: "Didn't you make spring steel?" Let's go, let's see! ”

It turns out that Xu You thinks too much. Although there are many lost black technologies in ancient times, the furnace temperature of the steelmaking furnace cannot reach more than 1600 degrees, and the liquid steel cannot be refined, which is a hard condition and is not negotiable.

Tiangongfang is on the north side of Mingyu Mountain, covers an area of dozens of acres, only nine shaft furnaces, 12 feet high, six feet in diameter, into a circle, the furnace wall is made of white sand stone and granite, and then mixed with refractory mud containing coarse sand particles, the blast wood fan is five feet high, four feet wide, and can be operated by four people. In addition, there were seventeen or eighteen houses for the piling and artisans to live in, and at the beginning of the construction, it was not necessary to be too large, so it was enough to cope with it.

"Lang Jun, look, what is this?" Zu Yu couldn't hide the excitement between his eyebrows, took Xu You's hand and came to the house, pointing to a knife on the knife shelf.

"Huh?" Xu You only felt that his eyes lit up, the cold air on the blade was coming, the knife body was exquisitely textured, and he couldn't help but praise: "The weeding flowers, the flowing cui, the iron knife...... Did you really build it? ”

"Yes, this is what Lang Jun said about the Su Iron Knife!"

Zu Xiaoxiao's eyes narrowed into a slit, and said: "Last time, Meng Langjun gave him the secret method of smelting, and finally obtained the magic technique of filling steel, and after repeated verification in the past few months, it has been completed!" ”

He took the knife in his hand, and asked people to bring in a dummy made of wood, the dummy was covered with layers of thin iron armor, and with a slight wave, neat cracks appeared visible to the naked eye, and finally counted, and the armor was broken thirty.

Xu You had a bottom in his heart, and he was not very surprised. Qingming had the candle dragon sword in his hand, and he didn't pay attention to all the weapons in the world, but He Wei and Zuo Yan were stunned.

In ancient times, the strength, hardness and sharpness of weapons increased exponentially, such as Cao Cao's Baipi knife, breaking gold and jade, and sharpening iron like mud, which can be compared with this iron knife, I am afraid that it will not be able to penetrate the thirty iron armor.

In the past, Pu Yuan made a knife for Zhuge Liang in the sloping valley, after the knife was completed, the bamboo tube was filled with iron beads, the knife was broken, the bamboo was broken and the beads were cracked, and the crown was at that time, and people called the divine knife. I look at Mr. Zu's knife, which is still above the divine knife! He Wei took the Su Tie knife from Zu Hu's hand, stroked it with his hand, and faintly felt that the edge was piercing and his skin was painful. One can imagine how lethal it would be if it was wielded by a small grandmaster like Zuo Yan...... This knife has to be a fetish!

Zu Xiao said with a smile: "Although Pu Yuan has real talent and learning, he still uses water as the raw material to quench and forge knives, he thinks that the water of the Han River is dull and weak, and it is not available, while the water of the Shu River is refreshing and strong, and it is best to use." In fact, there are better raw materials besides water...... This is what Lang Jun told me, quenching with horse puck and guine oil, both hard and tough, the best of both worlds! These two liquid quenching methods are really miraculous! ”

He looked at Xu You as he spoke, and the admiration and admiration in it were simply overflowing. At first, Xu You explained to him the cause of the steel filling method, and there were still many doubts and distrust in his heart, after all, the steel frying method is now popular, from the Western Han Dynasty to the present, it has lasted for hundreds of years, and the skill has been very mature and reliable. Although Xu You is a genius, after all, he has no background in related industries, can he really create something out of nothing, surpass countless skilled craftsmen, and push smelting technology to a higher level?

After months of hard work, none of them were obtained, and the blacksmiths under his command complained a lot, but Zu Hu caught some unspeakable mystery with a keen sense of smell in this failure, as if in the dark, he was really moving forward according to the path guided by Xu You, and what was waiting for him at the end would be the secret of the earth-shattering.

Sure enough, the advent of the iron knife proves that the steel filling method is much higher than the technical content of the steel frying method, and its significance is no less than the engraving printing technology of Tianqingfang, which is a qualitative progress in the industry, but also a leap forward in the overall civilization.

Xu You actually didn't know much about metallurgy, but only roughly understood the technological development process starting from the block refining method. For example, Qi Wuhuaiwen, the inventor of the steel filling method, selected high-quality iron ore, first smelted high-quality pig iron, and then poured liquid pig iron on wrought iron, which was smelted several times to make the wrought iron infiltrate carbon to form steel. Because pig iron and wrought iron are so-called "su" together, the steel that is smelted is called suku, and the sword that is smelted is also called sukutetsu knife.

This process is very simple, but to bathe in the drowning of the five animals, quenching in the fat of the five animals, the proportion of their respective quantities, the grasp of the fire time, these have no ready-made data, and there is no temperature control and temperature measurement instrument, all rely on the operator's subjective feelings and smelting skills, it is really complex and difficult to the extreme.

Xu You just provided ideas and opened a door, if it weren't for Zu Xiao's mastery of mathematics, astronomy, water conservancy, smelting and mechanical manufacturing, he could be called the top all-round talent in this era, and regardless of hard work, crazy experiments and countless record adjustments were carried out day and night, plus Ming Yushan provided a lot of financial support regardless of the results and use, and wanted to master the double-liquid quenching method in a short period of time and create the Su Iron Knife, which is undoubtedly a fool's dream.

Zuo Yan also bowed and said, "Lang Jun is really born to know!" ”

"It's not that I came up with the steel filling method, I have read the * family classics before, which records the prototype of the steel filling method, the so-called "steel is a hybrid refining and producing steel". Sheng, which is pig iron, is wrought iron, and miscellaneous refining is what Mr. Zu said. Since ancient times, except for saints, who can be born to know? ”

Xu You didn't want to continue this topic, he was concerned about the cost, and asked, "How much does it cost to stay with an iron knife like this?" How long does it take? ”

Zu Xiao thought for a while and said: "It will be very expensive at the beginning, but when the technique is proficient and the craftsman also practices it, and then forges a large number of it, the cost can be reduced to about 3,000 Wen, and you can get more than 1,000 knives in a month." ”

The problem of making weapons from 100 steels is that the cost is too high, Cao Cao's 100 sword took three years, and Sun Quan's sword only had to be used by seven people for two years and nine months. It wasn't until Qi Wuhuaiwen invented the steel filling method with Tianzhongzhi and used it to refine the Su Iron Knife, which found the perfect balance between quality and cost, and made a breakthrough in the ancient military industry.

"Good!" He Wei was overjoyed, even more excited than when he saw Su Tiedao just now, and said: "But this matter is listed as top secret for the time being, Mr. Zu knows it, and it must not be leaked out!" ”

Zu Xiao was still immersed in the excitement of creating history, and did not notice the deep meaning implied in He Wei's words, and nodded: "I understand, He Langjun rest assured!" ”

Since Xu You is the inventor of the steel filling method and the identity of the lord of the bar, it is natural that he will wear the first iron knife that opened the world. Xu You didn't shirk it, he really liked this knife, handed it to Qingming to hold, and went to visit the steelmaking furnace with Zu Qi.

"Heaven and earth have shapes, yin and yang have softness, and only the combination of yin and yang can make the best steel when smelting. Therefore I built these three furnaces in the shade to smelt iron. He also built three yang furnaces in sunny places to smelt pig iron. Then build three unified furnaces at the junction of yin and yang, and pour the molten pig iron into the unwrought iron. ”

Zu Xiao was proud at first, and then said proudly: "It's just that I didn't control the heat well at the beginning, and I wasted several stoves, and wasted a lot of money......

Xu You waved his hand and said, "The problems that money can solve are all nothing." You don't have to worry about this aspect, how much money is needed, just ask Ji Qinghe to get it, and go back to find his wings to sign the pledge. ”

Joke, science and technology are the primary productive forces, if you can make earth-shattering inventions without spending money or time, how can there be so many beautiful things in the world?

Next, Xu You asked in detail about the limit of the furnace temperature, the different construction structures of the Yin and Yang furnaces, as well as the air supply capacity and slag removal capacity, etc., until it was about to get dark, and then he returned to the house with Zu Xiao. He picked up a pen and wrote and drew on the paper, and everyone stood beside him, staring at each other with big eyes and little eyes.

After a full hour, Xu You raised his head, rubbed his temples, and said tiredly: "The fire of the furnace is pure green, and the warmth in the furnace should be about 1,200 degrees." ”

The original meaning of the idiom "pure green" means that the furnace has turned pure blue, and the temperature has reached its peak, which is 1200 degrees in later generations.

The measure word of degree, and Zu Xiao, who has learned the heavenly jade calculation, probably understands, his understanding of furnace temperature is far above Xu You, and he said ashamedly: "Yes, I have tried all the methods, and I can only turn cyan......"

"But that's not enough, the furnace can't be blue, and I can't make the kind of steel I want. Mr. Zu, you have to build another furnace, the height of which is two zhang above, as high as possible, but also pay attention to the sturdiness. The diameter of the inner wall is reduced to less than four feet, which is mentioned in the Heavenly Scripture Jade Calculation...... In addition, if the blower wooden fan is changed to a larger one, if it is driven by manpower, the air supply is insufficient, and the cylinder car must be used here. The cylinder car needs hydraulic power, how to build it, I will give you drawings in a few days, but there is nothing unusual, it is to improve the overturned car in the Eastern Han Dynasty, with the help of water power flowing down from a high place instead of manpower, so that the blower wooden fan rotates faster...... In addition, an additional regenerator chamber had to be built to increase the furnace temperature by preheating the air......"

Xu You found that it was too difficult and cumbersome to make something in the industrial age in the agricultural era, and he just wanted to add a shock absorber to the four-wheeled carriage, but this kind of spring steel required too many preconditions, and it was likely that after a lot of effort, it still couldn't be built.

But the progress of technology, that is, the failure to pile up into a mountain before later generations can climb up, this is not meaningless death, and in this process, there will be a lot of added value of unexpected joy, such as the iron knife, such as the upcoming waterwheel, these inventions will bring great impact to the world.

That's a good thing!

With the current technical conditions, if you want to increase the furnace temperature, you can only start from the structure of the furnace, reduce the size of the cross-section, and can effectively store heat. Improved blast technology can bring in more air in the same amount of time, and hydraulics have a huge advantage over manpower. This was considered when the site was selected for the Tiangongfang, so adjacent to Cuiyu Lake, it is very simple to open up a waterway to come, and use the height difference of the terrain to create a cylinder car to supply air.

As for the regenerator, Xu You really didn't know the specific structure, but he knew that there was such a thing. But there is Zu Xiao here, only put forward ideas, there is nothing he can't make, you can do it while making changes, anyway, it's not a matter of urgency, it's really invented, but it's a benefit.

Finally got these things done, Xu You led everyone out of the heavenly workshop, the bright moon was hanging high, the autumn breeze was cool, Xu You suddenly became poetic, and chanted: "The white arboreal crow in the atrium, the cold dew is silent and wet osmanthus." Tonight, the moon is bright, and I don't know whose house the autumn thoughts are. ”

Tonight, the moon is bright, and I don't know who will fall in autumn!

Jinling, thousands of miles away, but there are also people looking at the bright moon in the sky and missing the beloved in their hearts?