In the hearth, smoke began to appear.

Cao Ji didn't dare to stop, continued to drill the drill pipe, and sang loudly.

"Pun, push hard!"

As Cao Ji shouted, Cao Peng pulled out the pole hard, and then struggled to send it away. In the hearth, a flame rose suddenly, instantly igniting the drill plate. Cao Ji hurriedly let go, pushed Cao Peng to the side, and shouted loudly: "Peng'er, add charcoal, add charcoal!" ”

Wang Meng and his son brought in two buckets of charcoal from outside the shed.

Under Cao Ji's guidance, Cao Peng put it into the hearth very rhythmically.

Fill the furnace and keep the temperature of the furnace at bay. When the charcoal fire appeared, Cao Ji let go of the pole and motioned for Cao Peng to retreat.

Only this moment's work made Cao Peng tired and sweaty.

Not only physical tiredness, but also psychological fatigue...... This ritual of welcoming the arrival of the god of fire creates a very solemn environment. Working in this kind of environment, making one part of the force is equivalent to using three points or four parts of the force in normal times...... How can Cao Peng not be tired?

"Vulcan is here!"

The charcoal fire reflected Cao Ji's face red, and a bright smile appeared on his thick face.

"Dad, is this the end? When can I hammer it? ”

"Where's the end of this?"

Cao Ji smiled: "This is just the beginning. We'll have to keep an eye on the fire here, when the flame will change color, and when we'll be able to hit the first hammer. Peng'er, I told you a long time ago that striking iron is a very hard thing. Just by opening the furnace, from now on, we can't leave a step. When the first hammer falls, it is really over. Take a break and refresh yourself!

Whether the first hammer is good or not, but it has a lot to matter. ”

Cao Peng couldn't help but swallow his saliva!

Oh my God, it's been a long day, is it the beginning?

"Ah Fu, do a good job, I'm waiting for the treasure knife you will make with your own hands."

Wang Mai laughed heartlessly, and Cao Peng was so angry that he shouted: "Get out!" ”

In the blink of an eye, Wang Mai was gone......

Wang Meng was on the side, helping while chatting with Cao Ji.

The temperature in the shed gradually increased, Cao Peng wiped the sweat from his head and sat down on the side. Three hundred and sixty lines, the line is the champion...... It seems that this iron striking is really a technical job. An ordinary craftsman like Dad has to pay so much attention. I guess those masters, masters, will work harder. I really don't know, where did those legendary swordsmiths come from?

Cao Peng thought as he watched Cao Ji busy.

In this way, before you know it, the time of the day gradually passes.

As the sky began to darken, it suddenly began to snow heavily.

Deng Ji also came back and helped outside the shed.

"Let's start melting iron."

Cao Ji commanded, and Wang Meng immediately picked up a wooden barrel full of broken iron and poured it into it. These broken iron tools were all collected before. In fact, it is not very useful, mainly to pave the way for this first hammer. When the furnace is opened, it can't be rested. When the ironware in the furnace began to melt together, Cao Ji beckoned to Cao Peng and asked him to prepare for the hammer.

Using pliers to cut out a workpiece, Cao Peng stepped forward with a special hammer.

This hammer, weighing eighteen catties, was specially prepared by Cao Ji for Cao Peng. I saw Cao Peng take a deep breath, clamp the workpiece, and pull off the stance.

With one arm exerted, I only heard him roar, and he walked away from the dantian angrily, and the wheel hammer smashed down.

Clang......

There was a crunch, and sparks flew everywhere.

"The golden flower blooms, and the god of fire returns to the palace!"

Cao Ji was overjoyed, rushed over, grabbed the pliers, and smashed the wheel hammer.

The hammer he used weighed sixty-eight pounds, which was fifty pounds heavier than Cao Peng's hammer. The force of the smash is naturally different, and the clanging sound is endless. In the firelight, Cao Ji had an excited smile on his face, and his eyes were focused and charming......

With a single blow, it almost used the strength of the whole body.

After Cao Peng retreated, he let out a long breath of turbidity.

"Are you alright?"

"Hehe, I didn't mess it up."

"That's good, that's good!"

Deng Ji was in the shed, and it was thrilling to watch.

How could he have thought that with a hammer, he could also make such a momentum.

As Cao Ji rotated the sledgehammer, the muscles on the arms of ** beat rhythmically. Not only the arm force, but in fact, Cao Ji's whole body was moving, including his mind.

"Ah Fu, does the method you said really work?"

Wang Meng asked softly, Cao Peng smiled and said, "Is it useful, don't you know if you try it?" ”

As early as the Warring States Period, the ancestors invented and created quenching technology. But for a long time, from the Warring States period to the end of the Eastern Han Dynasty, no matter how people quenched, they could not get rid of using water as the cooling medium for quenching. During the Eastern Han Dynasty, people realized that by quenching with different waters, they could get knives with different surnames. As a result, water identification became a compulsory course for artisans.

It's just that this ability to distinguish water requires talent.

There may not be one out of a hundred, so that master craftsmen have become extremely scarce.

Pu Yuan, a knife-making expert in the late Three Kingdoms period, has such a technique. It's a pity that there are very few people who can master this technique.

Cao Ji doesn't know how to distinguish water, so naturally he can't become a master.

However, Cao Peng gave him an idea: quenching with animal urine first, and then quenching with animal fat, may have a miraculous effect.

Ask him how he knows this?

Cao Peng said: "It was the old alchemist who told me. ”

In my heart, I don't know how grateful I am to the mysterious old alchemist. If it weren't for him, Cao Peng really didn't know how to explain it.

In people's hearts, Fang Shi is a person with great magical powers, maybe he is still a god.

Since it was said by the gods, it must have a special effect. Cao Ji was naturally convinced and expressed his willingness to try without hesitation.

If Cao Peng's method can really solve the water problem, then Cao Ji can break through a threshold and take a big step.

In the shed, a pool of horse urine was prepared, as well as a pool of lard. Horse urine doesn't cost money, and the three horses of the Cao family are almost enough.

It's just this lard...... It really cost a lot of money.

If he fails, Cao Peng is afraid that he will inevitably suffer some blame.

"Dad, I'm tired, let's go rest first......"

"Okay, you go and rest first."

Cao Peng was naturally full of confidence, because the two-liquid quenching method he told Cao Ji had been confirmed in later generations. During the Northern and Southern Dynasties, Qi Wuhuaiwen, a soldier caster, invented this double-liquid quenching method and created the famous Su Iron Knife. It is precisely because of the emergence of this double-liquid quenching method that there is a later horizontal knife, a Mo knife...... Cao Peng believes that Cao Ji solves the problem of quenching and will definitely be able to take a big step. However, he did not tell Cao Jisu how to make the iron knife, because he felt that it was too early.

Back in his room, Cao Peng seemed to have collapsed, and as soon as he sat down, he didn't want to move again.

Finally solved a problem!

If Dad can use the double-liquid quenching method to make a good knife, no matter who he works for in the future, he can stand firm.

That's a great achievement......

The problem of quenching is solved, and all that remains is to increase the furnace temperature and solve the problem of bellows.

Cao Peng took a breath, stood up and walked to the bookcase.

Hey?

What about my drawings?

He was surprised to find that the bellows drawings he had drawn earlier were gone......

Cao Peng shuddered and rummaged through the cabinets in the room, but he didn't find those few drawings. Don't let anyone take it away!

He didn't care about the fatigue, and rushed out of the room like the wind.

"Mother, who entered my room today?"

Zhang and Cao Nan were preparing dinner, and they were stunned when they heard Cao Peng's roar.

"I didn't go in...... Anan, you're in? ”

Cao Nan shook his head, "I haven't entered Ah Fu's room?" Ah Fu, what's wrong? Why is your face so ugly...... Eh, where are you going? ”

Without waiting for her to finish, Cao Peng turned his head and left.

His room, usually no one would enter at all......

Except for Zhang and Cao Nan to help him clean up the room, neither Cao Ji nor Deng Ji, including Wang Meng, would go in.

Wang Mai often comes and goes, but he accompanies him all day today.

Calm down, be sure to be calm!

Cao Peng kept reminding himself and tried hard to recall.

Last night, I also studied the drawings...... Then I felt tired and went to sleep! But before going to bed, I ...... By the way, I stuffed the drawings in my leather pocket.

Where's my leather pocket?

Cao Peng was really anxious......

"Brother Tiger Head, have you seen my black leather pocket?"

Wang Mai said, "Is that the leather bag you took away this morning?" ”

"yes!"

"Didn't you bring it back?"

Come to think of it!

When you are resting from your own practice, you take off your leather pocket and put it under the peach tree on the river beach. I was in a hurry and forgot about it.

If it's broken, don't let anyone take it......

The leather bag was not worth much, at best because his mother had sewn it for him, and it was memorable. But the drawings in there ......

On Cao Peng's head, a layer of fine beads of sweat appeared in an instant.

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Thanks to book friends: Death of Twilight Rain, XFLJT, White Pterodactyl, Yunfeng, Son of Master Zhuoer, Ren Yue, Broken Time and Space, Seraph's Tears, Sword Rain Light Dust, Wu Yi, Sighing Death, Hailinhai generously rewarded!!!