Salt and iron have always been a national monopoly, and even Zhou Zhengqi can't get too much iron.

"That's going to be hard!" Lu Yishuang sighed.

"This coal can actually be burned with an iron stove!" Lu Yishuang casually drew a stick figure of an iron stove for him.

"Here the carbon is in, here the ash is removed, and here is a tin pipe to exhaust the smoke out of the house. So if you are careful, you won't get smoked! ”。

"Also, you can use an iron pot and an iron kettle to boil water on the stove for cooking, killing two birds with one stone!" Lu Yishuang dropped the wooden stick and said with a smile.

Zhou Zhengqi carefully memorized the picture in his heart and gently erased it with his feet.

"Well, that's good! It's just some scrap metal! Zhou Zhengqi said.

"Now the ironmaking process is not good, is it not enough firepower, or is it something else?" Lu Yishuang asked casually.

Zhou Zhengqi was shocked in her heart, and it was difficult for her to understand this.

"Firepower is not enough! Nowadays, with charcoal, it is difficult to fossilize large quantities of iron ore! ”。

"If that's all it takes, then this coal can come in handy!" Lu Yishuang said with a smile: "Processing coal into coking coal is far more powerful than charcoal, and there is no smoke. ”

"The county lord has a way to make this coking coal!" Zhou Zhengqi only felt his heart beating.

"I have!" Lu Yishuang replied with a smile.

"That?" Zhou Zhengqi licked his lips, thinking about what to say.

Lu Yishuang knew what he wanted to do, and stretched out three fingers with a grin. "Sancheng!".

"What?" Zhou Zhengqi was taken aback.

"The profits from selling coking coal will be divided into 30% for me, and I will teach you how to make it!" Lu Yishuang said with a smile.

"Oh, niece Xian, this, the old man didn't plan to ......," Zhou Zhengqi said with a bitter face.

"Hee-hee, don't fool me!" Lu Yishuang said with a smile: "I don't believe you are really as simple as water!" Once the use of this coking coal spreads, the silver will pour in like flowing water. If you want to tell me that this is not profitable, then let's stop it! ”。

"This method of making coking coal, I will bring it into the coffin."

Lu Yishuang used to grow up in a petrified town in the north. Before the local method of coking was banned, it was not uncommon to see others coking.

She even knows how to make steel.

Zhou Zhengqi smiled, and the wrinkles on his face were stretched. "Sure enough, it's a tiger father and no dog girl, you are so energetic, your father is not as good as you!".

"Old General Zhou, it's not that I love silver! You have also seen it, once this school opens, where is the money? Lu Yishuang stretched out her hands and sighed.

"That's less than a hundred students! When they come to their senses, there will be at least three or five hundred in this city! ”。

Zhou Zhengqi said: "There are a thousand!" ”。

"Yes! You see, if I don't get in, aren't these kids delayed? Lu Yishuang sighed.

"Do you think that if you don't give me this money, you can use it all if you hand it over?" Lu Yishuang raised her eyebrows and asked.

"You, you girl!" Zhou Zhengqi sighed: "Okay, it's thirty percent!" ”。

"Okay, I'll write down the coking method when I go back, and I'll send it to the house tomorrow." Lu Yishuang said with a smile.

"Hopefully, in the winter, we'll have a stove!" Lu Yishuang squinted her eyes, imagining snuggling by the fire in winter, eating roasted sweet potatoes.

Oh, and there are no sweet potatoes in this world!

If you turn around, let the sea boat that went to sea at home look around, and get back the potatoes, sweet potatoes, corn, and peppers!

Back in the city, Lu Yishuang began to write about the method of coking coal by the local method. She couldn't fake this to others, and after writing for a while, she was tortured by the brush and went crazy.

"Hibiscus, find me some goose feathers, and ask for the kind of long feathers." Lu Yishuang shouted.

Mu Hibiscus wondered in her heart, what does Miss Xindao want goose feathers for!

But doubts are doubts, she still asked the little girl to go out next door to ask for goose feathers.

At the sister-in-law's house next door, I fed two big white geese.

After a while, Hibiscus came back with a dozen goose feathers. Watch Lu Yishuang light the candle and prune it.

I dipped it in the polished ink, wrote it a few times, and smiled with satisfaction.

This is much faster to write, and it didn't take long to finish it in thousands of words.

As soon as Lu Yishuang went out, she saw the guards pestle outside the courtyard gate.

"Hey, you come and bring this to General Zhou!" Lu Yishuang handed over the sealed bamboo tube.

The guard saluted and went away with the bamboo tube!

Lu Yishuang stretched her waist and prepared to go back to catch up on sleep.

Zhou Zhengqi had been waiting for a long time, and when he saw the guards please see him, he suddenly smiled.

As a result, the bamboo tube was opened, and before I could take a closer look, I was shocked by Lu Yishuang's thin handwriting.

"What pen is this written in? Strange! Zhou Zhengqi only exclaimed, and immediately began to look at the method of coking.

Lu Yishuang wrote all vernacular texts, which are very detailed, and if you follow the steps above, there will be basically no problems.

"Hahahaha!" Zhou Zhengqi laughed happily.

Immediately sent someone to find his son to settle the matter of coking coal.

Lu Yishuang doesn't have to worry about the coking coal workshop and iron furnace workshop that are being built. Anyway, as long as Dad doesn't collapse, Zhou Zhengqi shouldn't cheat himself.

Of course, if Daddy really collapses, then no matter how much agreement is written, isn't it just a piece of waste paper?

These days, she is basically hanging around in the school. Lin Haobo didn't know what to say to his family, so he actually stayed.

"You're not going to participate in next year's Spring Festival?" Lu Yishuang asked.

"Participate! However, I wrote to my father that I should take a closer look at the operation of the border city here, broaden my horizons more, and look back to make a detailed and well-founded statement, so that I am more likely to get a good ranking in the exam! Lin Haobo followed her and walked to the head of the surrendered city.

Look out at the wilderness ahead, up and down to the sky. Behind it is the towering Fulong Mountain, a clear stream splits the valley, flows into the hinterland of the grassland from outside the surrendered city, and joins the Qingcao Lake forty miles away.

Defending the surrendered city means guarding the entrance to the Fulong Valley, and it is also the foundation of controlling the grassland in front of the mountain.

In the lush green grass, you can see snow-white sheep from time to time, and you can also hear the high-pitched and loud singing of herdsmen.

"In the capital, where can you see such a magnificent scene!" Lu Yishuang stood against the wind, opening her arms to face downward. The wind of the prairie blew and stirred her skirt.

The guards defending the city couldn't help but look sideways. However, looking at Lu Yishuang's eyes, there was only respect, but there was no obscenity.

These days, many more children are entering the schools in the city.

"One-two-one, one-two-one!" A large group of jagged teenagers came back from a distance, panting. The leading team saw the red figure on the head of the city and shouted loudly: "Lizheng, salute Mr. Lu!" ”。

Two hundred and twelve people immediately lined up and shouted at Lu Yishuang at the head of the city: "Hello Mr. Lu! ”。

Lu Yishuang waved her hand and said with a smile: "Hello! Are you tired? ”。

"Not tired!" The teenagers shouted in unison.