After a few days, everything fell into place.

After all, Li Su is also a young man with a real age of flesh who is about to be eighteen years old, how can he stand watching others show affection and sprinkle dog food every day? How can you bear it?

I have cultivated a relationship with Cai Yan for more than two years, even if I don't talk about those aspects, the tacit understanding between the brothers and sisters is still very deep.

On the fourth day after Zhang Fei's wedding, and two days after Cai Yan's relatives left every month, on October 22, Li Su calculated that the day was very safe, and he was ready to surprise his sister.

That night, he had dinner with Cai Yan in advance.

And Cai Yong can't go to Ba County for the time being, and recently he wants to rebuild a temporary "Dongguan" or "Lantai" in Nanzheng, and reclassify and display the collection of books from Luoyang for people to learn and borrow.

Liu Bei is also very supportive of this cause, not only asking for a house, but also specially looking for a place outside the city where the terrain is high and dry, and creating some new libraries with more thorough dehumidification.

He also sent Zhuge Jin, who originally followed Li Su as a teacher, as well as Zhuge Liang, Mi Wei, and other school-age children of Liu Bei's camp who studied with Zhuge Jin, to do chores, and guest librarians to help organize the display.

Therefore, Cai Yong has been so busy these days, he is not in Li Su's Hou Mansion at night, and he will not return until late at night. The daughter also stayed with the prospective son-in-law to partner temporarily.

After eating the chowder stew of mutton, dog meat, venison and leeks, let the maid clean up by herself, Li Su rested for a while, drank a cup of tea to eliminate food, and estimated that it had been half an hour after the meal, he quietly pulled Cai Yan and showed her a good thing that he had just made out in the past ten days.

"Senior sister, do you know what I plan to use the newly built cabin in the backyard for?" Li Su induces the curiosity of the junior sister.

Cai Yan was really curious: "What are you doing?" Ten days ago, I saw that you found a lot of carpenters to toss and fence them up. But the wood is all good wood, there are mahogany, sandalwood, mahogany, and some I don't know. You just take good wood to build a small house, and you don't need bricks and stones, which is also extravagant enough. ”

In fact, in this new log cabin in the backyard, Li Su also used oak trees and a small number of camphor wood, and his criteria for choosing wood are a few points:

The first should be strong, waterproof and impermeable, preferably wood that can be built for many years without rotting. The second is to prevent insects and mold, and it cannot be mildew due to long-term moisture. Finally, it is best to have some fragrant smell, such as camphor, which can not only prevent insects but also cover the smell.

After the house is built, the cover is beaten with hemp like the shipbuilding seepage prevention process (between the gaps of the wooden planks is hammered in and compacted, you can go to Douyin to search for the wooden boat hemp process), and finally brush with tung oil.

If these hands and feet were put on hold in the era when precious wood was very valuable in later generations, the price would be too high, but in the Han Dynasty, the greening was still very good, and the trees of high-end wood were not so scarce, and Li Su had no problem building houses.

As for the purpose of this construction, of course, it is for saunas. Didn't Liu Bei say that taking a bath for a long time hurts his vitality and is easy to damage a man's heroism, so let's change to a sauna to reduce the bathing time-

In fact, this is not Li Su's invention, because as early as more than 100 years ago, at the end of the Gongluo period and the early days of Tyluo, the Romans had already invented the sauna. It's just that the Romans' primitive sauna furnace stone method is not very good, and they often smoke the house black, and it is easy to be poisoned by carbon monoxide if you are not careful.

After all, in the era when there was no electric stove heating, one of the most serious problems in the sauna was how to heat the hearth stone in a confined space, but not let people die of poison or lack of oxygen. The ancient Romans also knew that a closed fire would suffocate people, so they often lit a lot of firestones outside the house in advance, and then transported a cart of red-hot hearthstone into a sauna cabin.

However, Li Su made a slight adjustment in the technology of the Romans, and he built a flue and a kang channel for lighting a fire with bricks and stones under the wooden house, just like the people of Northeast China burned the kang in later generations. It's just that, corresponding to the location of the Northeast people's kang plate, Li Su asked people to lay a large iron plate, and when the fire was lit, the fire was burned under this iron plate, and the heat can be transferred to the house quickly by using the thermal conductivity of the metal, and the carbon dioxide from the fire is isolated outside.

At the same time, before this iron plate was built, Li Su still worked hard, and the blacksmith metallurgical process in the Han Dynasty was not enough to form a high temperature that burned iron into molten iron, at most it only made the iron red hot and soft. But Li Su took advantage of the fact that the iron plate was hot and soft, and asked the craftsman to embed the selected hearth stone into the iron plate, so that after the iron plate cooled, the stone and the iron fit very tightly, at least the thermal conduction efficiency was very high.

When you are in a sauna, you can pour water directly on the hearth stone embedded in the iron plate to form enough water vapor.

Marco, the last of the Five Sage Emperors of Rome who reigned at the same time as Emperor Ling of Han. Aurelius, a sauna must be prepared four or five days in advance, many stoves must be opened, and a lot of hearthstones must be burned by servants, and servants need to keep transporting cold hearthstones out and replacing them with new red-hot hearthstones. And Li Su is not so troublesome, and directly burns the iron plate kang to heat the hearthstone.

In addition, Li Su doesn't like the pure small black house of the Diluo style, so he left a chimney-like ventilation hole in the corner of the wooden house, and the ventilation hole is also made of two U-shaped bends, a little moderate ventilation to avoid hypoxia, although the heat and water vapor will be lost as a result, but Li Su is not afraid of wasting fuel money, comfort is the most important.

In order to let in the light, he also left two round glass windows on the wall, the eyes are yellow and green, and they are not completely transparent, but they can finally transmit light, and they can see the outside scene dimly (square plate glass can't be made)

The price of this small window is not much different from that of making precious stones, and when outsiders see it, they will definitely be dumbfounded by its cost.

Soaking in a bath should have the luxury of bathing!

Mark. Aurelius can use the enjoyment, of course he has to go, otherwise it will not be a loss of the Han's heavenly prestige.

……

"This room is called a steam room, and the advantage is that you don't have to soak your body in water to relieve your muscles and fatigue - Brother Xuande hasn't always thought that my bathing method hurts my vitality, I figured this out, when I went in, wrap some cold water and wet bath towels around my lower body, and change it diligently, so it won't hurt my vitality."

Li Su led Cai Yan to a similar small black room with only two small glass windows, and introduced his new invention to surprise his sister.

"This ...... Can you bathe in such a hot and dry environment? Cai Yan couldn't help but be very curious, out of fear of the unknown of the little black house, he grabbed Li Su and didn't dare to let go.

"Of course, you can rinse a little before steaming, and after steaming, you have to rinse again to wash off the sweat, but the time of washing in water will be many times shorter than that of bathing. Come, take a look at the shower in this cubicle at the door. ”

Li Su said, there is an independent compartment that pulls the junior sister to the outside door, the size is about the same size as the entrance, and the door in the middle is also isolated from water vapor, so there will not be too much steam in the shower entrance, and there are also ventilation holes.

Li Su took off a leather tube made of nitrated beef intestines and a copper shower tied to the top of the leather pipe from the shelf, and the hot water immediately spilled out, and it was very comfortable to shower.

Li Suzao can't switch the tap water faucet, so he can only rely on the water pressure drop to control the water flow - as long as the shower is lifted to a shelf higher than the liquid level of the copper water tank, the water will naturally not flow. And this copper water tank is embedded in the wall, half of it is exposed outside the wall, and next to it is a masonry structure, which can be used to make a fire under the copper water tank to boil water.

In order to control the water temperature, there is also a cold water tank next to it, and if you feel that the hot water tank is too hot when you touch it with your hands, you can use the beef intestine tube to mix water at any time to adjust the temperature.

Cai Yan watched all these operations, and didn't care that his coat was soaked in the shower, and he was still standing there stunned:

"It's ingenious...... There are people in the world who can come up with so many tricks for bathing. Husband, where do you usually use this thought, and do you use three points for governing the country? This steam room, this shower, let the craftsman ponder for a lifetime can not think of it. ”

Li Su laughed jokingly: "This can't stand it? Now, this is a dry bath towel, anyway, you are also wet, rinse yourself and change this one, go in and steam it to know the real benefits of this thing. ”

He was not in a hurry to peek at it for a while, tonight was just to show off the new invention, so after throwing a few burlap bath towels to his junior sister, he went into the steam room very gentlemanly and poured water on the hearthstone to form steam.

It's a pity that there is no thermometer, and I don't know how many degrees it has been steamed, so I can only estimate it based on the feeling of my previous life.

"It's about forty or fifty degrees, forget it, the first steam, don't frighten the little girl, let's try the water in the drizzle like this."

If you were a bathing fanatic like Li Su in his previous life, he would start with steaming at 60 degrees every time, and he would often steam to 80 degrees.

The air heated to forty or fifty degrees, Cai Yan also changed into a bath towel and came in, and Li Su Shi Ran went out to change the cool bath towel in the rain, so as not to kill sperm in the high temperature.

"It's so warm in here...... I can't believe it's winter at the end of October, I sweated a lot at first, I felt sticky, and I quickly got used to it, but I felt refreshed, but I was a little soft and couldn't lift my strength...... That's a good thing. ”

Cai Yan insisted on steaming for fifteen minutes, and then leaned softly into Li Su's arms and was groggy.

Even if you drill a thick quilt in the bedroom, you are not as comfortable as here, and there is no smoke and fire from a charcoal basin for heating, only a humid atmosphere.

"Senior brother, can you make the temperature cool down for a while, so that you can sleep here comfortably at night." Cai Yan said in a daze.

"Then you'll have to get all the steam out, or you'll faint." Li Su replied casually.

When the sauna is finished with steam, it is equivalent to a hot spring house. For the Han Dynasty people who still had the habit of burning kang, the kang itself was also an attractive invention to improve the quality of life.

Those dignitaries and nobles burned charcoal pots to cover the quilts, and they had to be strict in winter, and even when they did that, they couldn't see anything in the quilt, how could there be a leisurely environment for bathing.

At least Li Su doesn't need a quilt to do those things, who in this world can compare? What girl doesn't envy this kind of surprise?

"Senior brother, I'm a little bored, you put the steam down, I'll go and wake up again." Cai Yan was afraid that he would faint, so he forcibly propped up his body.

Li Su thoughtfully opened the steam chimney and knocked on the glass window, showing that the fire-burning maid had extinguished the fuel for the kang first.

In the end, he lit a red candle with a romantic and elegant taste—if it was blinded by the black light, what was the difference between it and those boiled crane and burning qin soil buns stuffed in the quilt and "the same as turning off the lights"?

He and Cai Yan are both top cultural people in the world, and the poetry between them is opposed, of course

He cut the candles in the window together, but when it snowed at night in Bashan.