I was engaged in infrastructure construction in the Han Dynasty [Transmigration Book]

Liu Tan didn't wait for the water in the small copper basin to freeze completely before taking it out. There were ice balls and a little bit of water in it, which was a mixture of ice and water.

However, the more such a state, the easier it is to be convincing.

Liu Tan held the small copper basin in front of Liu Che and said with a smile, "Father, look, if you say you don't need it, you don't need it, right?"

Liu Che looked at Liu Tan in astonishment. Although he had a lot of speculations in his heart before, he had never seen Liu Tan perform a magic trick in front of him. What happened today?

Seeing Liu Che's expression, Liu Tan felt a sudden in his heart: It's broken, I've played with it.

He quickly cleared his throat and said: "Ahem, let me tell you the truth, it is saltpeter that can freeze water, and the water in this big basin is what it looks like after the saltpeter is dissolved. With it, ice can be made anytime, anywhere. If father doesn't believe it, you can try it."

The best way to break the feudal superstition is to let him do it himself. When something without the blessing of mysterious attributes becomes something that can be done casually, then the so-called magic of the immortal family will naturally break through.

Liu Che watched Liu Tan ask people to prepare things, and then according to what Liu Tan said, he threw saltpeter into the water in the big copper basin with his own hands, and then placed the small copper basin in the big copper basin, and saw the water in the small copper basin again. of water with a little bit of frozen flower.

Liu Tan smiled and said, "How is it? Isn't it fun?"

Liu Che waited until all the water in the small copper basin had frozen, then looked up at Liu Tan and asked, "Did you do anything to the saltpeter?"

Liu Tan was taken aback: "No, it's just ordinary saltpeter."

Liu Che had a look of disbelief, just throwing ordinary saltpeter into the water can make another basin of water freeze, how is this possible?

Liu Tan didn't know whether to laugh or cry and explained: "Saltpeter...it's just like this. When it's put into water, it absorbs heat. The temperature of the water in the small copper basin keeps dropping, and of course it will freeze in the end."

Liu Che asked calmly, "How do you prove that this is ordinary saltpeter?"

Liu Tan:? ? ? ? ?

How can he prove it? Is it possible that he should be allowed to mine now?No, it might be useless for him to mine it. It's not right to have someone else mine it. Even if someone else mines it, if Liu Che insists that he has tampered with it and cast a spell, there is no way to explain it.

Whose spells still have to be handled?

Liu Tan felt that he was going to be surrounded by Liu Che, and he couldn't think of any particularly good explanation for a while.

But saltpeter meets water is such a reaction, how can he explain this?

This is another disadvantage of the unformed technology system, that is, he knows the answers and results in vain, but does not have a more solid theory to support, not to mention that he has forgotten the reaction formula of saltpeter dissolving in water, so what if he knows ?Can it really be written directly?

Liu Tan's expression collapsed. If he had known this, he would not have teased Liu Che. Okay, this time he really has to play off.

Seeing his dull look, Liu Che couldn't help but secretly smile.

He somewhat believed what Liu Tan said, but this phenomenon was so miraculous that he couldn't accept it for a while.

But in any case, if Liu Tan could do this without secretly casting spells, it would be much easier to get ice in the future.

Liu Che used himself to teach Liu Tan a vivid lesson, to let him fully understand not to play tricks casually, if you can't explain clearly, it will be troublesome.

Fortunately, there is nothing to pretend to be in the future, after all, there is no other high-tech to show along the way.

And Liu Tan and Liu Che didn't often sit in the car, and occasionally went out to ride a horse to get some air.

Anyway, the carriage is there, and you can go in anytime when it gets hot.

In fact, Liu Tan prefers to be outside rather than in the car. Although it's hot, he feels a sense of accomplishment.

Yes, it is a sense of accomplishment.

Their route was arranged by Huo Guang, and our Prime Minister of the Northern Borderlands has carefully arranged all the places that can showcase the work of the Northern Borderlands over the past few years.

For example, the wasteland planted with saltwood has basically never stopped in the past few years since the planting of saltwood. Those Huns planted it wherever they went. At a glance, there are dots of green on those barren land. meaning.

It is these dots of greenery that are said to be able to reduce the degree of wind and sand flying. In the past, once there was a strong wind, it was basically sand and dust that covered the sky and the sun.

There is still a lot of dust now, but it is somewhat clearer than before.

Liu Che hadn't seen much saltwood before, and it was a bit strange when he discovered that there are plants that can grow tenaciously on the Gobi land and grow well.

After Liu Che learned why Liu Tan planted salt trees, he asked, "Then the Yellow River will not change its course frequently?"

Liu Tan shook his head and said: "The reason why the Yellow River diverts frequently is because it carries too much silt, and among those silt, there is actually very little produced in the territory of the northern border country, and more of it is in the Loess Plateau area. The land is barren, if you want to calm down the Yellow River, you have to treat that side as well."

Liu Che didn't say anything. The area of ​​the Loess Plateau is not small. The most important thing is that there are no vassal states there, or even if there are vassal states, they may not be willing to work hard to govern them.

But now the Dahan treasury has just breathed a sigh of relief, and has invested a lot in the management of the Yellow River over the years.

In the northern border country, saltwood can be planted in such a large area so quickly. In the final analysis, it is because Liu Tan has many captives of the Huns. Fortunately, even if you can get the household registration of a big man, you can also distribute the land, so you work extra hard.

There are no such conditions in other places. It is not enough for the people to be busy planting their own land. How can they have time to grow salt?

It is also unrealistic for Liu Tan to transport the Hun captives there. After all, that side is already considered the hinterland of the Han Dynasty. If so many Hun captives come over, if these people rebel, it may threaten Chang'an.

Liu Che couldn't help sighing, if it wasn't really inappropriate and the distance between the two sides was too far, he even wanted to give that piece of land to Liu Tan as a fief.

Anyway, as long as the Yellow River can be managed well, Liu Tan can do whatever he wants.

But this is just thinking about it. If the land over there is really given to Liu Tan as a fief, the entire Han court would not agree. That area plus the Northern Border Kingdom basically occupies more than [-]% of the land of the Han Dynasty.

Now Liu Tandu has been targeted, and has started spreading songs, not to mention later.

Looking at Liu Che's expression, Liu Tan knew what he was worried about. After thinking for a while, he said, "Father, there are actually some people who are more useful than the Hun captives."

Liu Che asked, "Who?"

"Refugees."

Liu Che was surprised: "Refugees?"

Liu Tan nodded: "Yes, refugees, the current refugees are generally in the mountains, because they escaped the war and went in. These people may not know that the war is over now. Even if they know that they have no land because they have no household registration, they can only come out. As slaves, that’s why they stayed in the mountains and refused to come out. If the imperial court recruited them and promised to allocate land to them after planting as many trees as they promised, they would definitely be willing to come.”

Liu Che asked: "Since you said that the refugees are used to life in the mountains, why did they come out?"

Liu Tan smiled slightly: "There are a lot of materials in the mountains, but no matter how many there are, it is impossible to be completely self-sufficient. If nothing else, just talk about salt, they have to find ways to trade with the outside world, and Ruo Erchen guessed right. They There must be an extreme lack of salt, and then there is food, and the mountains mean that farming is very difficult, as for hunting... If hunting is so easy, how can the refugees be so miserable?"

Liu Che said thoughtfully: "This is a method. In this way, you can write a strategy later and give it to the prince, and let the prince do it."

Liu Tan: ...

This is the second time, let him tell the prince what he thinks, and then the prince will go to work.

The two of them did everything, Dad, what are you doing?

Looking at Liu Tan's expression, Liu Che raised his eyebrows and said, "Why? Don't you want to?"

Liu Tan said with a wry smile: "Of course not, it's just that you are always in charge of such an important matter, it's just that the two of us always have omissions."

Liu Che said sarcastically, "You two? You are the one who came up with the idea. Let the prince discuss the rest with everyone!"

Liu Che is in the northern border country, but the authority of the whole Han Dynasty is still operating in Chang'an. According to the current situation, let alone Liu Che who has been out for a few months, he will be fine if he doesn't go back for a year!

Of course, it is impossible not to go back for a year. After all, there are two major festivals, Winter Solstice and Zhengdan, and Liu Che has to go back to worship the ancestors.

After passing through this relatively barren place, fields gradually began to appear.

Finally, everything was green, and there were fields of crops at a glance. Of course, Liu Che couldn't help running out to ride a horse.

Walking on the road and looking around, he was a little surprised and asked, "Didn't you just think of this keel waterwheel before?"

Liu Tan followed his gaze and found that there was already a keel waterwheel at the edge of the field. He couldn't help laughing and said: "Yes, I thought of it on the spur of the moment when I said that the round-wheeled waterwheel cost money. After I made the model, I let Huo Guang go to it." Arranged, his hands and feet are quite fast."

Liu Che was deeply shocked. This kind of shock came from the efficiency of the northern border country. It would not be surprising if there were keel waterwheels around Shuofang City.

After all, it is the capital of the kingdom, so it is relatively easy to promote it.

But this is already within the scope of Xi'an Yang County, and it is at least a hundred and eighty miles away from Shuofang City. How long has it been?Have been using this place in less than a month?

For the first time, Liu Che was curious about the operation of the Northern Borderlands, and he couldn't help asking: "How can so many people use the keel waterwheel in a short period of time?"

Liu Tan looked at Liu Che and said nothing, Liu Che didn't hear the answer and turned to look at him: "What's there to hide?"

Liu Tan smiled wryly: "It's not that I want to hide it, the main thing is... I don't know either."

Liu Che:? ? ? ?

What about the king of the northern border that was agreed to cover the sky with one hand in the northern border country?