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

After Liu Tan finished writing these twelve characters, he drew a summary symbol and wrote the six body of drawing, and then he saw that Kai Guan also stood up, pressed his hand repeatedly and said: "You sit first, don't worry, don't worry about it. Ask about your guilt."

Kai Guan took a serious look at Liu Tan's face, and sat down cautiously.

After he sat down, Liu Tan asked, "Do you understand?"

Kai Guan was a little hesitant, a little afraid that Liu Tan would be dissatisfied if he said something he didn't understand.

Liu Tan seemed to see his hesitation, tapped the blackboard and said, "Tell the truth."

Kai Guan said honestly, "I don't understand."

Liu Tan drew a circle on the word drawing and asked, "Do you understand this?"

Kai Guan glanced at it, and didn't quite understand it at first, but suddenly he remembered that Liu Tan had told him before that he was going to draw a map, make a map... Isn't that what he meant?

He quickly replied: "Cao Min understands, is this the method used to draw a map?"

Liu Tan nodded in satisfaction. Talking to smart people is a peace of mind.

He said: "You have never been exposed to these concepts, no, or no one in the whole big man can understand except me, so it is normal for you to not understand. Now I will explain the meaning of these words to you."

He drew a circle on the ratio and said: "This represents the ratio of the size of the long model. From reality to drawings, it must be reduced. But before that, there are no regulations on how much to reduce and how much it differs from reality. , so I decided that when drawing a map, the length and area of ​​the real object is ten times that of the map."

After hearing this, Kai Guan was still a little dazed. He didn't have much contact with maps, so naturally he didn't know how to draw this.

Liu Tan seemed to see his doubts, and quickly said: "You write down these definitions first, and I will explain you systematically first, and we will explain them in detail later."

Kai Guan could only suppress the doubts in his heart, and honestly picked up a pen and wrote down these definitions on paper—the paper he was using at this time was still unimproved paper.

After Liu Tan explained the division rate, he continued to explain: "The so-called accurate look is to determine the relationship between the topography and the mutual orientation of the features; Daoli, the distance between the roads between two places; high and low is the relative height; Fang Xie , the undulating slope of the ground; the ups and downs on the ground and the conversion on the map, have you all written it down?"

Kui Guan said seriously: "I wrote it down."

These things are relatively simple, or the number of words is small, and he memorizes while writing, so it is not difficult to memorize them.

Liu Tan put his pen down and asked, "Is there anything you can understand?"

Kai Guan took a serious look and said: "You can see some meaning, but you can't tell the specifics. However, Caomin can see that after the formulation of His Highness's set of rules, the map and reality will become more accurate. Easy to understand, Your Highness is a genius!"

Liu Tan was really relieved, luckily he didn't meet a stupid student, and luckily he used to take the place of the teacher when he was in graduate school, otherwise he really didn't know how to teach people.

But Kai Guan was very excited. He had already seen that this set of mapping rules is very simple and clear, and the map drawn will be more clear. If there is no war, it will be fine. shine.

Although cartographers may not be famous all over the world, they will definitely be reused.

And because Liu Tan was so careful to ask him to sign the document before, and even restricted his personal freedom, he suddenly realized.

If it were him, he would do the same.

Kai Guan studied very seriously, he knew very well that it was impossible for Liu Tan, who formulated this system, to draw the drawings himself, then only he who had learned this system would be the most suitable person, and he might even get a commission from the court. provision.

So even though Kai Guan was a little cautious at the beginning, he was afraid that asking too many questions would make Liu Tan bored, but after he found that Liu Tan had a good temper and a lot of patience, he began to pay attention to every detail.

And Liu Tan was actually relieved to see him like this. Mapping is a meticulous job, and it is necessary to dig out the details a little bit. Otherwise, if one detail goes wrong, it may cause problems in all coordinate positioning.

After thoroughly understanding the six elements of cartography, Liu Tan taught him the method of planning and painting.

In fact, Jilihuafang is more like an auxiliary means of drawing six bodies, for more precise positioning.

And after mastering the planning and drawing method, it means that Kai Guan should now be able to formally draw a map.

Of course, Liu Tan couldn't ask Kai Guan to draw a map when he came up. The first task he gave Kai Guan was to draw a map of Shi Heyuan.

When Kai Guan heard this order, he fell to the ground in fright.

Shi He Garden is a royal garden, or it was bestowed by the emperor himself. If he wants to draw a map, he must look at every place, no matter how remote the place is.

As we all know, the royal family and nobles usually have some secrets that they don't want others to know. What if he discovers the secrets and they are silenced?

Kai Guan was so frightened that he declined again and again. Liu Tan didn't understand why he was so timid at first, but Miao Rui couldn't see it, so he whispered: "Your Highness, Shi Heyuan was built by His Majesty himself, and it is not good for him to know too much. .”

Liu Tan understood it as soon as he heard it, and after thinking about it, he sent Kai Guan to Zhuangzi. This time, he was not allowed to draw the whole picture. He was asked to draw the village first, village by village, except for his palace. , he can draw anywhere else, but he must give him the finished picture within ten days.

Kai Guan didn't understand why Liu Tan stipulated ten days, but he ran to Zhuangzi with his bedding and began to draw pictures hard.

However, it was actually because at this time, it was only ten days before Liu Tan went to Wusun.

If Kai Guan's drawing fails to meet the standard within ten days, then Liu Tan may really have to roll up his sleeves by himself.

Fortunately, Kai Guan did not live up to his expectations. It took him only five days to finish painting a village in five days instead of ten days.

Of course, this is also the reason why the drawing is relatively simple. Liu Tan didn't ask him to draw a three-dimensional view. It would be nice if he could draw the top view clearly.

Kai Guan handed in the "homework" a little nervously, and Liu Tan was quite satisfied after taking a look at it. The only problem was that this grid affected the perception too much.

No matter how thin the line is, it is easy to overlap with certain roads and rivers. If you want to copy it completely on another paper, but now you can't make paper as thin as a cicada's wing, you need to continue to improve the technology.

Kai Guan looked at Liu Tan's frown and couldn't help being a little frightened. He was really worried that his map drawing would not pass.

Liu Tan raised his head and saw Kai Guan's trembling look, he couldn't help but smiled and said, "Very well done."

Suddenly, Kai Guan's eyes lit up, and he looked at Liu Tan expectantly and asked, "Then... am I considered a graduate?"

Liu Tan nodded and said, "Of course, even if I'm asked to draw, I may not be able to reach this level. I just found that the method of drawing squares seems to be... not very useful. There are too many lines, which easily disturbs judgment."

Kui Guan immediately said: "I have basically grasped the relationship between size and ratio, even without a grid!"

Liu Tan shook his head. He couldn't count on all the people in the world to be crowned. This method must be promoted. No matter whether you can get the maps of other countries, the big man's own map is definitely needed.

And he is not afraid of the Huns learning this method, they can learn it, do they have the paper?

Liu Tan took the paper and thought for a long time, and finally decided to start with the drawing board. He directly made a square frame with a wooden board, and then used a thin line to make a grid in the middle according to the proportion, and then made a wedge to make it fit together with the drawing board. , so that there is a grid as a judgment when drawing, and at the same time, the grid will not be allowed to stay on it after the drawing is completed.

The only downside is probably that there will be some missing ink where there is a grid, but this lack is basically negligible, and it will be enough to fill in a few strokes at that time.

For the sake of portability, Liu Tannong's drawing board is not very big, and his request is to let Kai Guan draw one by one, and then put together a complete picture in the end.

Looking at the things prepared for him, Kai Guan always felt that Liu Tan seemed to have high expectations for him, and he didn't just want him to draw a map of Chang'an City. He couldn't help asking: "Your Highness, would you like Where do I draw?"

Liu Tan said: "In two days, I will go to Wusun, and then you will go with me, and you can draw a picture of the places you pass along the way, but after you leave the Yumen Pass, you will leave the team, and I will send someone to protect you." You will also send a guide to lead the way for you. I want you to draw a clear map of the road from Yumenguan to Wusun. Wusun is not far from the Xiongnu. When the time comes, you should try to get closer to it and draw the map there. Draw it too."

Kai Guan never expected that Liu Tan would ask him to draw a map of the Western Regions. The road to Wusun in the front was fine, but when he heard that he was going to get close to the Xiongnu, his legs went limp.

Kai Guan swallowed his saliva and said: "His... Your Highness, Caomin... Caomin can't afford such a big responsibility."

Liu Tan looked at him condescendingly and said, "Don't you want to be famous? If you can draw this map, your father will definitely be happy. I will never treat people who have meritorious deeds badly. Then your father may see you, you It is the No.1 map of Dahan, fame and wealth are all at your fingertips, and all of this requires you to take a small risk."

Kai Guan was a little moved, and Liu Tan smiled when he saw him like this: "What's more, I want the map, and I won't let you go to die, and I don't really want you to go to the Huns, but I just want to get closer if there is any danger. , my people will naturally protect you and withdraw."

Kai Guan lowered his head and pondered for a while, then suddenly raised his head and said firmly: "Cao Min is at the disposal of His Highness!"

Liu Tan smiled and asked him to go down to prepare. After Kai Guan left, he recalled it, and always felt that what he just said seemed to be a villain who seduced people's hearts.

But in fact, what he said was the truth. How could he let him die with such a talent?

After letting Kai Guan to pack his things, he continued to practice his riding skills.

These days he has been taking time out to practice riding skills, but the progress is very slow. Up to now, he can only walk on horseback. Once the horse starts to run, he gets nervous. Just eat the pain, the horse will run faster when the horse eats the pain, and then he will be more nervous.

This is simply a vicious circle, but he still has nothing to do.

In the end, Li Buyan had some headaches, and he simply said: "Otherwise...after leaving Chang'an, Your Highness can take the car."

Liu Tan also thought about it, but finally made a difficult decision: "I have to wait until the next day to change the car."

This... is fine.

On the day of seeing off her relatives, Princess Danyang dressed up in a red dress to bid farewell to the empress.

I don't know if it was Liu Tan's illusion, but he always felt that Liu Che's face was flat and without any emotion, while Chen Ajiao's eyes were slightly red, but she held on.

Liu Che only encouraged Princess Danyang in an official way. When he turned his head to look at Liu Tan, the expression on his face became very worried: "This trip is thousands of miles away, so you must be careful. I have urgent matters to discuss with him."

Liu Tan was shocked when he heard this: Why didn't you say it earlier?How can such a great man go to the Western Regions?If something happens on the way, I won't be able to afford it!