"The boy is good, the old man knows that he didn't see you."

For Fang Yiai, Cheng Yanjin didn't have anything to be polite, patted him on the shoulder, praised him, picked up the wine glass again, and couldn't help Fang Yiai to say, and touched him, "Come, drink!" ”

Fang Yiai took this cup hard, and began to think about how to escape from the wine, he didn't dare to fight with Lao Cheng, otherwise he would have a headache to death when he got up tomorrow morning.

Just then, there was the sound of footsteps outside the door.

Li Shimin no longer listened to the root of the wall, laughed heartily, and walked into the house while joking Cheng Biting Jin, "Zhijie, you are well informed, I only learned about this cold thing today, so you came to ask for advice." ”

Cheng Yanjin and Fang Yiai hurriedly got up and were about to salute.

"No need to be polite."

Li Shimin waved his hand casually to prevent the two from wearing red tape, and took their seats as a matter of course. Fang Yiai personally ran down and put dishes and chopsticks on him.

Cheng Yanjin smiled and said quite smugly: "There are farmers in the village who help in Fangjiazhuang, so they are well-informed." ”

"The minister is thinking, if Zhuang Shang wants to repair this fire kang, how can he have a prophet."

Saying that, he poured a glass of wine for Li Er, Li Junxian was just about to step forward, and it seemed that he was going to test the poison, but Li Er stopped him with his eyes.

He picked up his glass and said, "When did you become so particular about Zhijie?" ”

Li Er still understands Lao Cheng, and if he doesn't care about it, he has to fight for three points, when will he say hello to someone in advance.

Cheng Biting Jin was very thick-skinned, and he didn't quibble about Li Shiming's sarcasm, but took it for granted, and replied confidently, "It's not the boy Fang who made it, we can't bully the juniors." ”

Raising his head and drinking it all, exhaling a breath of hot air, Li Er glanced at Lao Cheng, shook his head helplessly and smiled bitterly.

He took two bites of food, and his eyes lit up and said, "The palace also learned from Fangfu, why does your food here taste better?" ”

"Perhaps, Your Majesty's mood is different." Fang Yiai said.

Li Shimin smiled when he heard this, didn't say anything more, and talked about the business of this trip, his expression became serious, "Can the 'fire kang' really keep out the cold?" ”

"Yes!"

Fang Yiai replied in the affirmative.

Li Shimin smiled, since Fang Yiai was so sure, he no longer doubted it, but became curious, and couldn't help asking: "Is it repaired?" Can I take a look? ”

"It's in the bedroom, please move with your majesty."

In the bedroom.

The kang occupies half of the room, the mud is still wet to the touch, the stove connected to the kang head is still burning at this time, the kang is really steaming with visible heat, enough to see the temperature above, the mud is mixed with wheat straw, there is no need to worry about cracking.

"Is this kang easy to make?"

Seeing the scene in front of him, Li Shimin looked happy and couldn't wait to ask.

"As Your Majesty can see, the fire kang is completely made of earth and stone, and the material is very convenient, and the temperature is provided by the heat in the smoke of the firewood.

Listening to Fang Yiai's narration, Li Shimin's eyes became brighter and brighter, as if he had seen a rare treasure.

When the words fell, Li Shimin was full of praise for it, "Wonderful ideas, really wonderful ideas!" You kid has been surprising me, and this is something for the benefit of the world. ”

Cheng Yanjin watched from the side, happy and a little envious at the same time, looking at His Majesty's tone and attitude, he completely treated Fang Yiai as a nephew!

"Congratulations, Your Majesty, with this fire kang, many people will freeze to death this winter! God bless me Datang! Hahaha......"

In ancient times, people would freeze to death every winter, and this number was not a small number, and it has always been a big trouble for the imperial court that the population attaches great importance to.

"The minister doesn't dare to take credit."

Fang Yiai gave up his hand politely, and seeing Li Shimin's happy appearance, he couldn't help but feel a move in his heart, "Your Majesty, the minister also has two inventions, things used to keep out the cold......

"Uh......"

Li Shimin and Cheng Biting Jin were stunned for a moment, and the two of them stared at Fang Yiai with the eyes of a monster. In the end, joy overcame surprise, and Li Shimin couldn't help urging: "Come quickly!" ”

"One of them, the minister has already drawn before, and plans to install it in the house this year. Qiao'er, you go to the study, bring the drawing, and bring the pencil and paper. ”

Fang Yiai said, instructing Qiao'er to get the drawings, he continued: "In fact, when it comes to heating, it is not firewood, charcoal has a higher heat content, and the reserves are more than firewood. ”

"Burnable charcoal is toxic and not suitable for use at home, so people choose charcoal." Cheng Yanjin questioned.

Carbon monoxide poisoning, Fang Yiai naturally knew, he smiled lightly and said: "But charcoal is very expensive, ordinary people can't afford to burn it!" In fact, the solution to tobacco poison is very simple, as long as people do not come into contact with it, they do not have to worry about poisoning. ”

"For example, if you can fix the stove outside the house, you can use it with confidence."

Li Shimin also looked puzzled, said he couldn't figure it out, and asked: "But, in this way, how to give people heating." ”

At this time, Qiao'er took a drawing, which was the style diagram of the radiator.

Fang Yiai stretched out his hand to take it, spread out the drawing, and said: "For example, this one, I call it 'heating', use these copper pipes to lead to the house, fill the pipe with water, and connect one end to the pot on the stove, after the water in the pot is hot, the heat is transferred through the water." ”

Li Shimin and Cheng Biting Jin looked at the drawings with big eyes and small eyes, always feeling that their brains were not enough, and they felt that Fang Yiai was reasonable, but they still expressed doubts: "This is ...... Does it really work? ”

"The village is building heating, and it will be clear in the near future."

Fang Yiai said this, and the two of them were not entangled, and it didn't take long to see the results.

Immediately afterwards, Li Shimin's brows furrowed again, and he questioned, "But the cost of this thing is quite high, and it is not something that ordinary people can afford." ”

"So, the minister also designed one, which is relatively cheap."

As he spoke, Fang Yiai drew with his hands, "This thing is called a coal stove, and the charcoal is thrown into it to burn, and the smoke is discharged along the chimney, which can solve the problem of tobacco poison." ”

"Coal stoves only require a stove and a chimney, which is relatively much cheaper, and can be made into honeycomb coal, which is conducive to combustion, and the pulverized coal is not wasted."

Seeing the inventions of Fang Yi's love, thinking about the excitement when he first saw the fire kang, Li Shimin and the two felt like a hillbilly who had never seen the world.

I was a little dumbfounded for a while, what a whimsical idea!

"Ahem!"

Cheng Yanjin coughed lightly to hide his embarrassment, and then praised in a different way: "Okay! Fang Boy is really talented, inventing three things in a row! ”

Li Shimin was high-spirited, "Immediately issue an edict, distribute the drawings to the whole country, and order local governments to help the people build fire kang before winter to resist the severe cold of winter, and ensure that no one freezes to death in winter." ”