It probably took Qin Tian another day to finally finish the swimming pool on the Nine Princesses' Mansion.

Once the pool is done, all you need to do is add water to it, and as the charcoal burns outside, the water here will be kept at a certain temperature, like a hot spring.

After Qin Tian finished his work in the princess's mansion, he was already tired and a little tired.

This job is not easy to do, and the key is that there is no pay, which is really unexciting.

However, thinking that after the Ninth Princess was done, he could finally rest, Qin Tian was still somewhat relieved.

But just when Qin Tian thought so, many powerful people in Chang'an City came up one after another.

The fire kang is no longer a secret in Chang'an City, especially after even Cheng bites gold, it is even more impossible to become a secret.

Cheng Yanjin is a person who likes to show off very much, he has something like a fire kang in his house, how can he not show off?

As soon as Cheng Biting Jin showed off, the magnates of the entire Chang'an City knew about it.

Yes, whether it was good or not, it all poured in at once.

"Lord Qin, please also ask the craftsman who bothered you to go to my house, as long as the kang is ready, the price is not a problem."

"Lord Qin, go to my house first, I'll come first."

"I'm bidding ......"

"I'm not low ...... either"

Everyone was fighting in the Qin Mansion, and Qin Tian saw that it was profitable, so he liked it, and immediately organized the two groups of craftsmen who made the kang in the mansion, so that they were ready to do a big job.

The people who came registered in the Qin Mansion in order, and they all called for a deposit, and after that, the two groups of people began to make a fire kang in order.

Although the kang is simple, many programs cannot be sloppy, so a group of people can do up to three in a day, and two people can do six in a day, which is very slow.

Qin Tian took a look at the people who came to register, there were more than 100 families, this was done, but it was almost a month, and at that time, winter was almost over.

And if nothing else, more and more people will come to register.

If it is winter, these people's kang has not been ready, it will be a bad thing.

This is a good opportunity to make money, Qin Tian wondered if he could train a few more batches of craftsmen by himself, so that the efficiency was high, the speed was fast, and he could make more money.

Thinking like this, Qin Tian felt that it was too necessary.

That's why we are prepared.

And just when Qin Tian was making this kind of preparation, the early dynasty was in the middle of the day, and a group of officials talked to each other.

"Let's go, let's go find a restaurant to drink."

"Don't go, those restaurants are very cold, if you want to drink, let's go to my house, sit on the kang, the thief is warm, and then there is a drunken beauty, it will be perfect."

"Oh, Lord Zhang's kang is ready, then I have to go to Lord Zhang's house to drink, my house is lined up until the day after tomorrow, it's really urgent."

"Haha, take your time, the day after tomorrow will be soon, and when you really sleep on the ondol, you will know that the kang is good."

"That's, that's, and I'll never freeze again......"

When the officials said this, the crown prince Li Jiancheng and a few of his subordinates walked over, Li Jiancheng heard the conversation of these people, his expression was pale, and he couldn't help but roll his eyes.

When he returned to the East Palace, he was furious.

"Damn, this kid Qin Tian is in the limelight again, the self-rain house in the summer, the fire kang in the winter, now everyone is almost unable to lack him, damn, damn......"

Li Jiancheng took a sip of a glass of wine angrily, and after drinking this sip of wine, he found that it was Qin Tian's drunken beauty, he originally liked this wine very much, but at this time, he was angry, and he opened his mouth and spit out the wine again.

"Disgusting, disgusting......"

Li Jiancheng scolded, suddenly feeling chills all over his body, thinking of what those officials said about the good ondol, he felt more and more that his room was cold, and the cold was uncomfortable.

"It would be nice if I could use the kang myself, I heard that there are other swimming pools and hot springs......" Li Jiancheng thought in his heart, but when he thought about it, he made it difficult.

Others can go to Qin Tian to build a self-rain house, can he be the prince?

If he went to Qin Tian, it would be too embarrassing, which he would definitely not be able to accept.

If you don't go to him, how can you build a fire kang?

It sounds like it's quite simple, but many places are also very exquisite, send people to other officials' homes to study, even if the research is thorough, this technology is also skilled, I'm afraid it's next year, right?

Thinking about it, Li Jiancheng called Song Gongqing and told Song Gongqing his thoughts.

After Song Gongqing heard about the fire kang, he was also very yearning, but the prince didn't speak, and he didn't dare to say that he wanted it, but now he was overjoyed to see that the prince coincided with him.

"If the prince really wants to use a fire kang, it's not difficult, he just needs to find someone from the Ministry of Works."

"Ministry of Works?"

Song Gongqing nodded: "Huokang, the benefit is for the people, this technology should still be shared." ”

When Song Gongqing said this, Li Jiancheng immediately understood, so he didn't hesitate, and hurriedly sent someone to call Lu Feng, the secretary of the Ministry of Industry.

The Ministry of Industry is the least existential of the six departments, although the official positions of the six books are about the same, but the Ministry of Industry books meet other books, all of them are inferior.

Yes, he was summoned by the prince, and Lu Feng, the secretary of the Ministry of Works, was a little flattered.

"Minister Lu Feng visited His Royal Highness the Prince, I don't know why His Royal Highness the Crown Prince announced that His Royal Highness was coming?"

Li Jiancheng told Lu Feng about the situation, and after listening to it, Lu Feng didn't think there was any problem, so he immediately responded.

After Lu Feng got down, he went directly into the palace.

In the imperial study, Li Yuan had just finished lunch and was about to take a nap, when the eunuch ran over: "Holy Lord, Lord Lu Feng Lu, the secretary of the Ministry of Works, asks to see you?" ”

"What is he doing at this time?" Li Yuan was puzzled, but still let Lu Feng in.

After Lu Feng came in, Li Yuan asked, "Lu Aiqing is here at this time, but what's the matter?" ”

Because he had just come to the early dynasty, it was indeed strange for Lu Feng to come at this time, if there was anything, he should say it in the early dynasty.

Lu Feng said: "Holy Lord, the minister came to ask the Holy Lord for approval of one thing. ”

"What?"

"Recently, Lord Qin invented the fire kang fire, the minister thinks that the fire kang is beneficial to the people, and it should not be only a few people who can enjoy it, so the minister wants to ask the saint to approve Lord Qin to hand over the technology of the fire kang to the craftsmen of the Ministry of Industry, which is conducive to the inheritance of technology, and is also conducive to the spread of the fire kang in my Tang Dynasty."

Many techniques will be passed down in different forms, some are taught to apprentices, so that they are passed on from generation to generation, and some are directly recorded and passed on to future generations.

These are some of the means that will be very helpful to future generations, if it were not for these, many civilizations and technologies in China would only be afraid of a more powerful fault.

All dynasties and dynasties have also supported the inheritance and dissemination of culture and technology, if the fire kang can be transmitted to all parts of the Tang Dynasty, then the life of the people of the Tang Dynasty will be much better, right?

It's just that after listening to Lu Feng's words, Li Yuan frowned slightly, and his face was embarrassed.

(End of chapter)