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

In Liu Che's side, Li Guangli was probably no different from a miner. He looked at Li Guangli differently because of his favorite concubine, and Li Guangli had no other skills other than eloquence, not as good as his younger brother Li Yannian.

Liu Che just sighed and put this matter behind him. He has too many things to do every day, how could he waste so much energy on it?

After Liu Tan finished writing the letter, his whole person also fell silent.

Although every day is still the same as before, but the words are much less than before, and even people begin to lose weight rapidly.

Huo Guang and Jiang Chong regretted seeing him like this.

They couldn't quite understand why Liu Tan did this, but if they had known this would cause this consequence, the two of them would have used more tactful means.

You must know that this trip to the Western Regions has suffered a lot, and the baby fat on his face has disappeared a lot. Now, the outline is more angular, and he looks more powerful than before, especially when he is quiet and silent. When looking at people, those extremely black eyes can even make people feel cold behind their backs.

Liu Tan received a notice from Liu Che this time, but Liu Che didn't mention Li Guangli's matter, and he didn't know whether he didn't want to mention it or wanted to go back and talk about it later.

But when he saw that the person who took over was Li Xi, he was still relieved.

If nothing else, at least Li Xi won't hold him back.

It's just that he still recruited Li Buyan, and asked him to go back and tell Li Xi about Li Guangli's affairs, so that Li Xi knew that if he dared to touch the gold mine, it would be a dead end.

Li Buyan was not very happy when he learned that Li Xi was coming. In his opinion, now that he has made some contributions, he should have a place in the court. Why would he need to let his father come to suffer?

Every teenager with a dream wants to replace his father and become the pillar of the family after he has a little achievement.

Liu Tan just said: "General Li is more familiar with this place than you. Don't know the heights of heaven and earth once you have fought a battle. General Li and the others fought against the Xiongnu back then."

Li Buyan seemed a little unconvinced, but he also knew that Liu Tan was telling the truth, so he could only reluctantly say: "The old man went to the north of Hetao, and we were in the Western Regions, not in the same direction. He may not be familiar with this place!"

Liu Tan was surprised: "Eh? We're not together? Then I won't be able to see Langjuxu Mountain?"

Li Buyan:? ? ? ? ?

For a moment, Li Buyan was in a mess. He thought that Liu Tan, who had figured out the latest drawing method of the map, must know his way very well. How could he not be able to tell the north from the south?

He trembled and said, "Your Highness, don't you...don't recognize the map or remember the road?"

Liu Tan said calmly: "Of course I know Yutu. Go north, go south, left, west, right, east. Whether you remember the way or not depends on fate."

Li Buyan gasped suddenly, he suddenly felt a little afraid that the army could reach Jieguo smoothly... Is this really blessed by God?

This city is a transfer station, not too close to Jieguo, and there are no official roads. Not only are there no official roads, but most of the way is in the Gobi. The army did not get lost!

You must know that the general guide is the job of the chief general, because no one except the chief general and other generals knows the strategy and tactics.

This is also the reason why Li Guang lost his way with the army, otherwise... Doesn't one of his men know the way?But they were all taken into the ditch by Li Guang, and when they tried to find their way back, they were already in a strange place, and the guide was useless.

Li Buyan couldn't help but sighed with emotion: "God really blesses me."

Liu Tan couldn't help but rolled his eyes at him, but Li Buyan reminded him that he hasn't figured out the compass yet.

With a map and a compass, it should be easier to march and fight.

To be honest, things like Sinan have actually appeared a long time ago, but they have always been very large. It was first carved into a ladle-shaped thing using natural magnets during the Warring States Period, and then placed on a smooth flat plate with directions engraved on it. The principle of magnet guides, there are also Sinan vehicles in the military.

However, this thing is still very precious, so it will only be allocated when there is a real battle. Although Liu Tan has a lot of soldiers who came this time, the most important thing is to protect him, so there is no equipment.

In fact, Liu Tan was also very puzzled, since everyone knew the guide to magnets, why did he have to think hard about carving magnets into shapes.

If you do this, there is no way to point the direction correctly if the magnet is less than a certain size.

Especially Luan Da, when Luan Da was fooling Liu Che, he used a magnet to engage in a game of chess, and then attracted Liu Che Longyan Dayue to give him the title of General Wuli.

You said, if Luan Da used the magnet to get a compass directly, Liu Che would have been happier, and he wouldn't have been killed in half!

Liu Tan sighed and asked someone to get some magnets and iron pieces over.

Iron smelting technology is just so-so these days, but Liu Tan originally wanted to make a sample for his father to see, and it doesn't have to be of high quality. If you really want good quality, just ask Liu Che to order it at that time.

When all the raw materials were put in front of Liu Tan, Liu Tan was in trouble. He vaguely remembered that he only made a simple compass made of embroidery needles back then. That kind of thing was for children to understand the principle. There is no way to use it at all. You can't go out to fight and you have to bring a basin of water guide, right?What if the water freezes in cold weather?

Or the water is spilled, and then there is no distinction between east, west, and north. Isn't this cheating?

Liu Tan chose to simplify it. First of all, the needle body of the compass cannot be fixed, it must be flexible, so Liu Tan first cut a section of thin silver pillar, and then cut a piece of silver into a circle, poked a hole in the middle and fixed it on the thin silver pillar Then the iron piece used as a guide rubs back and forth on the magnet first, and when the iron piece forms an unnatural magnetic pole, it is taken down and poked in the middle and placed on the silver column, but it cannot be fixed, and a round silver piece is fixed on it .

Except for the main part of the compass, the rest of the place is basically made of silver, because pure silver itself is very soft and easy to mold, and it is not easy to affect the magnetic poles.

Liu Tan fixed this part on a round wooden block, then ran out to find out the direction, and after confirming the direction with others, he engraved the words "east, west, south, north" on the wooden block.

A simple compass is basically done here.

To be honest, Liu Tan felt that it was a compliment to say that this thing was simple, but it was simply simple!

Simple is simple, Liu Tan didn't think about using this version directly, he was still thinking about using the magnet version.

Because the iron sheet is a non-natural magnet, it is easy to demagnetize when encountering high temperature impact. What if it is demagnetized in a fight?

Even if there is a spare, such a fragile compass can be used by civilians, but it cannot be used by the military.

So Liu Tan used the same magnetic poles of the two magnets to polish them into conical shapes, and then used the previous method to make a rotatable silver holder after they were adsorbed together.

Liu Tan looked at the two similarly crude compasses, and felt that if he just handed them over to Liu Che, he would be disgusted by Liu Che. Finally, after thinking about it, he decided to ask someone to make a gold shell, which was illuminated with thin transparent crystals. Then wrap this compass.

Well, he's also losing weight to his humble compass in the process.

As for how to use it in the military, that's what the people below need to worry about.

He knew that these two compasses were not perfect, but... they were always better than Si Nan Che, right?

That's all he has. Now that the samples have been made, can't the people below use their clever little heads to improve?

Liu talked about it without any psychological burden.

When he was tossing about these things, no one bothered him anymore, even Huo Guang and Jiang Chong wanted him to do something else to divert his attention.

When Liu Tan took out the compass to show off, apart from marveling at his genius idea, what was on everyone's minds was more - Your Highness won't think about Li Guangli again after leaving the customs, right?

Jiang Chong even glanced at Huo Guang secretly: Do you want to find something for His Highness to do?

Huo Guang was a little helpless, Liu Tan's ideas in this regard were wild and unconstrained, and most people couldn't keep up with his brain circuits, let alone find the direction he was interested in.

But soon he remembered something, and asked, "Your Highness wanted to make some cakes before, do you want to continue?"

Liu Tan first glanced at Huo Guang inexplicably after hearing this, cake?What cake?

After a while, he suddenly realized: Huo Guang was talking about compressed biscuits, right?

Thinking of compressed biscuits made him feel heartache, but he could only wave his hands: "Let's talk about that thing when we go back, the conditions here are not enough."

In fact, the conditions may not be sufficient after returning. As for the subsidiary product fried noodles... there is actually no way to promote it.

How precious is the oil now, how many times can ordinary people eat it a year?Not to mention poorer families.

The military expenditure of the big man is already very stretched, let alone doing these things.

Thinking of this, Liu Tan felt melancholy and said: "When we return to the customs, these soldiers will probably go back to their respective homes. Give them some rewards at that time, and it will not be in vain for them to fight their lives with me."

Huo Guang was a little helpless. Since these soldiers followed Liu Tan, they would get some rewards from time to time. Oh, in Huo Guang's eyes, the meat that Liu Tan gave them as an extra meal was also a reward. Talking about paying out of his own pocket for a reward, now he will do it again.

Huo Guang didn't care about the money, he was just worried that after the rewards were over, the treatment of these soldiers would plummet when they returned to their original places, which would easily breed resentment.

However, in the past, he would definitely persuade, but now... forget it, what to persuade, as long as the fifth prince of his family is happy.

Liu Tan was indeed happy. He regretted the matter of Li Guangli, but he couldn't keep regretting it. After the pain, remember, he still has to bring his teacher back to Beijing. What's the point of always being so sad?When the time came to award the rewards, no one would dare to be happy, wouldn't that be cheating?

Just when Huo Guang and Jiang Chong were worrying about how to find something for Liu Tan to do, Li Xi finally came late.

It doesn't seem appropriate to say that he came late. After all, Li Xi also came here through wind and rain, and he didn't dare to rest on the way. He just wanted to get his biological son and adopted son back as soon as possible.

To be honest, winning a battle is certainly something to be happy about, but the Western Region is not a peaceful place, so it's fine if you don't do anything, but once you do, it will be very unsafe here. As an elder, Li Xi can't wait to fly back to Chang'an within a day.

Li Xi finally arrived at the new city, and first met his own son who came out to greet him.

After this trip, Li Buyan's temperament has also changed a little bit, but the biggest change is his appearance. He is a little darker, but he looks taller and stronger. Not to mention anything else, he looks like a fierce general .

Li Xi was very happy in his heart. Liu Che liked the image of Li Buyan very much. Liu Che also looked at the appearance when ordering soldiers to lead the army. Otherwise, how could Li Guangli lead the troops out of the customs?

Li Bujin was naturally happy to see his father, but he was strict with his mouth. He had nothing but to talk to his father, ask his mother, and ask about his younger siblings. He took him to meet Liu Tan directly.

After Li Xi raised his head to salute Liu Tan, the smile on his face slowly disappeared, and even tears almost fell down: "Your Highness, why are you so thin?"

Liu Tan was immediately stunned by him: "Huh?"