Soon, the potter Gao He, the stonemason Liu Da'an, the carpenter Liu Erwa, the blacksmith Ma Zhu, including the salt merchant Gu Dabiao, the owner of the linen shop, the carpenter and several wealthy families in the town, as well as the three old men who were already in school, Niu Quan, the four pavilion chiefs and Liu Po himself, and several people with heads and faces in Qinghe Town, all arrived.

The class was interrupted halfway, and a group of little babies suddenly rushed out of the classroom to play, and then more than a dozen people sat respectfully in front of the desk like a group of primary school students, looking at Chen Xu standing on the podium together.

"I called everyone here today because winter is coming soon, and judging from the situation in previous years, this winter will be very cold, in order to help everyone in Qinghe Town to survive this cold winter, I have specially designed a kind of kang that can be warmed, the style I have drawn, everyone ......look at it" Chen Xu turned around and pointed to the two pictures he had drawn on the stone slab in advance with the bamboo stick in his hand.

One is a cross-sectional view of the entire clay kang, and the other is a top view of the internal structure of the clay kang, both of which are very simple.

"The clay kang is actually an enlarged version of the clay stove, but it is necessary to close the stove with the clay pot and clay pot on it and make it into a bed, because the area is relatively large, and in order to be heated evenly, so the inside should be made into a furrow shape with a twist and bend, so that the hot smoke generated after the clay stove burns through these surrounding ravines in the kang to achieve the purpose of heating, here is the entrance to the firewood, these curved flues inside, if it is two kangs, you can connect the two kangs together through the hole in the ground, so the two kangs are also close together as much as possibleIn order to ......make the fireworks inside burn and exhaust the smoke smoothly, a chimney must be built, and the chimney must be kept away from the thatch on the roof, otherwise I am afraid that there will be sparks on the roof and ignite and bring disaster......

With Chen Xu's explanation, a group of people in the classroom were all moved, especially the three old men and several elderly craftsmen, all of them were excited, and their beards and eyebrows were constantly shaking.

As the saying goes, the little is afraid of the wind, and the old is afraid of the winter, which is what people are afraid of in the two stages of the weakest resistance, young and old.

Children because the various organs of the body are not fully developed, so all kinds of functions are very fragile, especially the lungs, so children are afraid of wind, accidentally easy to catch a cold and cause pneumonia, generally in the spring and autumn windy season, are children a large number of sick when the main cause.

After people are old, the functions of the body begin to degenerate, qi and blood failure is not smooth, so they are particularly afraid of the cold, and they are all kinds of uncomfortable in winter, with pain all over the body, stiff legs and feet, rheumatism and old cold legs, all kinds of problems are coming, and if you are not careful, you will not be able to resist the death, so every winter is the popular season for a large number of old people to die, and rural people sometimes have to catch up with several white things in the cold winter of the later generations, and they are the old people who can not survive the cold winter.

"The structure of this kang is simple, and it is not difficult to transform and build, now only because of the materials made, I asked Liu Erwa yesterday to make me a square frame mold, which is used to make mud bricks, so that when building the ondol, it is more regular, and in order to isolate the smoke and fire of the bed and is strong enough, I asked Liu Da'an to build some stone slabs, the chimney is more important and higher, I let Gaohe burn a batch of clay bricks, but at present, if more than 600 households in Qinghe Town want to be successfully transformed, these things are in huge demand, I can't prepare it before the cold winter comes, so I called everyone here today to listen to everyone's opinions and suggestions, and come up with a simple way to make the kang repair before the cold winter comes......"

After Chen Xu finished speaking, everyone in the classroom began to think intently.

Indeed, according to Chen Xu, although the fire kang is fresh, it is definitely not complicated, and the principle is extremely simple, and the only thing to consider now is the material, to solve the thing that replaces the stone slab and chimney.

"Chen Lidian, to make the flue under the ondol, if in order to save time and effort, in fact, you don't need adobe bricks, you just need to choose the right stone to build the shape of the flue, and then use yellow mud to fill the gaps of the stone to dry, and even these trenches are directly made of bamboo and wood into hollow strips, and after filling the soil, they are tamped and formed, just like using rammed earth to make the city wall, but if the cover on it does not use stone slabs, it is indeed a little difficult to deal with!" Potter Takagawa stood up and said.

Chen Xu nodded, this method is good, it is indeed much faster than using adobe bricks, but it is not as convenient as adobe bricks, it takes a long time to get it at home, and it is inconvenient to eat and live, but for the moment, it is more suitable than using adobe bricks, so this method can be regarded as solving the problem of adobe bricks.

"In fact, there is no slate is not a way to isolate the fireworks, first use bamboo strips to weave into a few feet square bamboo board, and then both sides are covered with thick yellow mud to dry, and then put it in the fire to dry and form, if it is not cracked, it can be used to replace the slate, not to mention that according to the design of the lidian, there is not much flame in the flue under the kang, at most it is fire smoke, and it will definitely not ignite the bamboo pieces inside. That's what my earthen stove does, and I haven't had any problems with it for more than 10 years. The craftsman stood up and said.

"Really?" Chen Xu was overjoyed.

"Don't dare to lie, if you don't believe it, you can go to my house to see, although the earthen stove has been damaged in many places, but only the stove made of yellow clay board that was fired at the beginning is still good." The craftsman hastened to say.

"Lidian, there should be no problem with this method, the yellow mud is unusually tight and strong after drying, and it is even stronger after firing, I'm afraid it is not much different from bluestone, unless it can be broken with a heavy object! The earliest pottery was made with yellow clay. Potter Takagawa also said.

"Haha, that's good, that's good, as long as you can solve the problem of isolating the flue, the rest will be easy to do, and the saved slate can be used to make a chimney!" Chen Xu said happily.

"Lidian, in fact, the chimney can also be used in this way, every household can do it by itself, first use bamboo strips or strong rattan to weave into a high one foot two feet of net-like tube, and then the inside and outside are also covered with thick yellow mud, after drying, put it in the fire to fire, and then these cylinders are cut off with yellow mud to glue together to become a chimney, which is more convenient and fast than using clay bricks, although the yellow mud is afraid of rain soaking, but the rain is scarce in winter, even if the snow does not stick to it, if you are not at ease, You can use a small amount of clay bricks or even broken pottery pots to cover the top of the chimney, so that the chimney will not collapse, as long as you survive the cold winter, and then slowly find bricks and stones to build a new one next year! The craftsman said again.

Damn, you're a master builder, it's a shame to be a craftsman!

Chen Xu was instantly impressed by the carpenter, and directly pointed at the carpenter and said: "Niu San, this matter will be handed over to you, Liu Po, you arrange a few people to be Niu San's helpers, and according to the method just mentioned, make a complete soil kang in the open space to see the effect." ”

"Good!" Liu Po quickly stood up.

In the winter of the twenty-seventh year of the first emperor, the seminar on the promotion of soil kang in Qinghe Town took less than half an hour to complete, and basically solved all of Chen Xu's problems very satisfactorily.

"Ancient people were so smart, how can Lao Tzu mix in the future?" Chen Xu pinched his chin and sat on the podium and muttered to himself, then looked at Yu Wuya, who was standing next to him, and said a little lonely, "Wuya, why didn't I think of these at first, it should be very simple!" ”

"Engong you think too much, these things are not important, the important thing is the ondol, if there is no whimsy of yours, give them a hundred or even five hundred years may not come up with it, I heard that the counties of the Northland also have something similar to the ondol, but in fact it is a stove, which burns charcoal, and the family sits around the stove to keep warm and keep out the cold, but can not sleep also, and charcoal is valuable, and only the nobles and wealthy families of the princes and princes can enjoy it, and the non-toiling people can enjoy it, this invention of Engong is simple and convenient and costs very little, It will completely solve the hardships of the people of the Central Plains and the north of the country through the cold winter, and all the people of the world will benefit also, Liegong once said: Heaven and earth have no full merit, saints have no omnipotence, and all things are useless. It's not that Engong can't, but there is no need, the three volumes of the Book of Heaven are the law to help the world and save the people, not the ability of craftsmen, so Engong doesn't need to blame himself at all, craftsmen, Xiaodao'er! ”

Well, that's good!

Chen Xu immediately stood up in a comfortable mood and patted Yu Wuya's shoulder, this straight man and foodie understood Chen Xu's mood better than everyone else, and clearly pointed out that Chen Xu should be a wise man with the help of the three heavenly books, not a craftsman, and making bricks and tiles is just a small way, not a saint's doing!

So then Chen Xu happily took Yu Wuya to the winery on horseback.

The current winery is no longer a pure winery, the main function is to boil sugar, in the past, it was a smell of fermented sour wine from afar, but now half of Qinghe Town can smell a sweet smell, every day there are countless children around the winery outside the neck to visit inside.

When the two of them rode to the winery, there was already a large group of children gathered outside the wall, one by one watching the inside swallowing saliva, watching a few helpers inside boiling sugar in more than a dozen clay pots of all sizes under a pergola in the courtyard, and at the same time some villagers came to sell wild fruits with rattan baskets on their backs.

It seems that Qinghe Distillery is going to be changed to Qinghe Sugar and Distillery.

Chen Xu opened a group of children with a little emotion, and walked in with Yu Wuya, and then a thick sweet smell with a burnt smell came to his face.