Soon, potter Gao He, stonemason Liu Da'an, carpenter Liu Erwa, blacksmith Ma Gan, salt merchant Gu Dabiao, linen shop owner, bamboo craftsman, several wealthy families in the town, as well as three old men who were already teaching in school, Niu Quan, four pavilion chiefs and You Jiao Liu Po, etc., all of them were well-known in Qinghe Town.

Class was interrupted in the middle of the journey, and a group of little kids rushed out of the classroom to play. Then more than a dozen people sat respectfully in front of the desk like a group of elementary school students, looking at Chen Xu standing on the podium together.

"I called everyone here today because it was about to start winter. And based on the situation in previous years, it will be very cold this winter. In order to help everyone in Qinghe Town to survive this cold winter safely, I specially designed a warm kang. I have already drawn the style. Let's see..." Chen Xu turned around and pointed at the two pictures he had already drawn on the stone slab in advance.

One is a sectional view of the entire earthen kang, and the other is a top view of the internal structure of the earthen kang, and the drawings are all very simple.

"The earth kang is actually an enlarged earth stove, but the stove top with the pot and pot pot on it must be closed and made into a bed. Because the area is relatively large and in order to be evenly heated, the inside must be made into a forked and curved gullies so that the hot smoke generated after the earth stove burns through these surrounding gullies can pass through the kang to achieve the purpose of heating. This is the entrance to burn firewood, and the curved flue inside is the flue. If it is two kangs, the two kangs can be connected together through the ground holes, so the two kangs can be as close as possible to facilitate the circulation of hot air... This is the outlet of smoke. In order to allow the fireworks inside to burn and exhaust smoke smoothly, a chimney must be built. The chimney must be kept away from the thatch on the roof, otherwise you will be afraid that Mars will fall on the roof and ignite and bring disasters..."

As Chen Xu explained, the group of people in the classroom were moved, especially the three old men and several older craftsmen, who were all excited, and their beards and eyebrows were constantly shaking.

As the saying goes, "Small fear wind and old fear winter" means things that people are afraid of in the two stages of young and old, which are the weakest resistance.

Because all the organs in the body have not yet been fully developed, all the functions are very fragile, especially the lungs. Therefore, children are afraid of blowing wind, and they are prone to catch a cold and cause pneumonia if they are not careful. Generally, when the wind is strong in spring and autumn, it is the time when children get sick a lot, and pneumonia cough is the main cause.

After aging, all the functions of the body begin to deteriorate, and the qi and blood are exhausted and flowing poorly. Therefore, they are particularly afraid of the cold. They feel uncomfortable all over the body, pain all over their legs, stiff legs, and all kinds of problems with rheumatism and cold legs come. If you are not careful, you will be unable to resist passing away. Therefore, every winter is a popular season for a large number of elderly people to die. In the cold winter of later generations, rural people sometimes have to take several funeral events a month, and they are all elderly people who can't survive the cold winter.

"The structure of this kind of kang is simple, and it is not difficult to renovate and build. Now it is only because of the materials used. Yesterday, I asked Liu Erwa to make a square mold for me to make mud bricks. This way, the kang is more regular when building it. In order to isolate the fireworks and it is strong enough, I asked Liu Da'an to create some stone slabs. The chimney is more important and high. I asked Gaohe to burn a batch of tiles. But now it seems that if more than 600 households in Qinghe Town have to be successfully renovated, these things are in huge demand and cannot be prepared before the cold winter comes. So today I called everyone here just to hear everyone's opinions and suggestions and come up with a simple way so that all villagers can repair the kang before the cold winter comes..."

After Chen Xu finished speaking, everyone in the classroom began to concentrate on thinking.

Indeed, according to Chen Xu, although the kang is fresh, it is absolutely not complicated, and the principle is extremely simple. The only thing to consider now is the materials, which solves the problem of replacing slabs and chimneys.

"Chen Lidian, if you want to make the flue under the kang, in order to save time and effort, you can still do it without earth bricks. You just need to choose the right stone to build the shape of the flue, and then fill the gaps of the stones with yellow mud to dry. Even these grooves are made of bamboo and wood directly into hollow strips, and then fill the soil and tamp it in a solid shape, which is the same as using rammed earth to make a city wall. However, if the covers on it are not made with stone slabs, it is indeed a bit difficult to deal with!" potter Gao He stood up and said.

Chen Xu nodded. This method is good. It is indeed much faster than using acres of bricks, but it is not as convenient as making it. It takes a long time to make it at home and wait for it to dry. It is inconvenient to eat and live. But for now, it is more suitable than using acres of bricks, so this method solves the problem of acres of bricks.

"In fact, there is no stone slab, and it is not impossible to isolate fireworks. First, weave bamboo strips into bamboo slabs several feet square, then apply thick yellow mud on both sides to dry, then put them in the fire to dry and mold. If they don't crack, they can be used to replace the stone slabs. Moreover, according to the design of Lidian, there is actually not much flame in the flue under the kang. At most, it is fire smoke and will never ignite the bamboo slabs inside. Be careful when sitting and lying on it on the surface, there will definitely be no accidents. This method is actually very common. This is how my earth stove is done. It has been used for more than ten years without any problems." The bamboo craftsman stood up and said.

"Really?" Chen Xu was very happy.

"I dare not lie. If you don't believe it, you can go to my house to see it. Although the earth stove has been damaged in many places, the stove made of yellow clay boards made from the original fired is still good." The bamboo craftsman said quickly.

"Lidian, there should be no problem with this method. The yellow mud is extremely tightened and firm after drying, and it will be a little stronger after firing. It is probably not much different from bluestone. It can only be broken unless it is hit by heavy objects! The earliest use of pottery was made," said the potter Gao He.

"Haha, that's good, that's good. As long as the problem of isolating the flue can be solved, the rest will be easy to deal with. The saved stone slabs can be used to make chimneys!" Chen Xu said happily.

"Lidian, in fact, chimneys can also be made in this way. Every household can make them by themselves. First, weave them with bamboo strips or strong rattans into a mesh barrel one foot or two feet tall, and then apply thick yellow mud inside and outside, dry them, and then put them in the fire to make them. Then bond these cylinders one by one with yellow mud to form a chimney, which is more convenient and quicker than using ceramic tiles. Although yellow mud is afraid of rainwater, there is little rain in winter, and even snow will not stick to it. If you are not at ease, you can use a small amount of ceramic tiles or even broken ceramic basins to cover the top of the chimney, so that the chimney will not collapse. As long as you survive the cold winter, you will slowly look for bricks and stones next year to rebuild one!" said the bamboo craftsman again.

Damn, you are a master of construction, it’s such a pity to be a bamboo craftsman!

Chen Xu looked at the bamboo craftsman with admiration and pointed at the bamboo craftsman and said, "Niu San, I'll leave this matter to you. Liu Po, you can arrange a few people to help Niu San. Then, according to the method you just said, make a complete earthen kang in the open space to see the effect."

"Okay!" Liu Po ​​stood up quickly.

This seminar on the promotion and development of earth kang in Qinghe Town in the winter of the 27th year of the First Emperor was held in less than half an hour, and basically solved all Chen Xu's problems very successfully. After a group of people said goodbye and left one after another, Chen Xu was still a little like a dream.

"The ancients were so smart. How could I do it in the future?" Chen Xu sat on the podium with his chin pinched his chin and muttered to himself, then looked at Yu Wuya standing next to him and said a little lonely, "Wuya, why didn't I think of these at first? It should be very simple!"

"My benefactor, you think too much. These things are not important. What is important is the kang. If you don't have your wonderful ideas, you may not think about it for another hundred or even five hundred years. I heard that there are things like kangs in the northern counties, but in fact they are fire stoves, where charcoal is burned. The family can sit around the fire stove to keep warm and keep the cold, but they cannot fall asleep. Moreover, charcoal is valuable, and only nobles and wealthy families can enjoy it. The invention of the benefactor is simple and convenient and costs very little. It will completely solve the hardships of the people in the Central Plains and the North for experiencing the cold winter. All the people in the world will benefit. Lie Gong once said: Heaven and earth have no perfect achievements, saints have no omnipotence, and all things have no full use. It is not that the benefactor cannot, but that is not needed. The three volumes of heavenly books are the way to save the world and the people, not the ability of craftsmen, so the benefactor does not need to blame himself at all. Craftsmen, small Taoist!"

OK, very good!

Chen Xu immediately stood up and patted Yu Wuya's shoulder. This straight male cancer and foodie understood Chen Xu's mood more than everyone else. He clearly pointed out that Chen Xu should be a wise man with three volumes of heavenly books, not a craftsman. Making bricks and tiles is just a small way, not a saint!

So Chen Xu happily took Yu Wuya to the winery with him.

The winery is no longer a pure winery. Its main function is to boil sugar. In the past, I could smell a fermented sour wine from a distance, but now half of Qinghe Town can smell a sweet smell. Every day, countless children gather outside the winery to visit the neck inward.

When the two rode horses to the winery, there were already a large group of children surrounding the wall, watching them swallowing their saliva from inside, watching several helpers boil candy in more than ten pottery basins of large and small under a pergola in the yard. At the same time, some villagers in groups of three or three came to sell wild fruits with baskets and vine baskets on their backs.

It seems that Qinghe Winehouse will be changed to Qinghe Sugar Winehouse.
Chapter completed!