Deng Kui was Deng Zilong's personal soldier and often took on the scout's horn during combat, that is, the scout. As a scout, in addition to understanding the enemy's troops' configuration and returning to report to the main general, he also had a very important task, which was to draw a map of the war zone for the main general to arrange troops.

The mapping technology of map surveying and mapping back then was very backward. Many maps could not even guarantee the minimum proportional relationship, let alone the use of contour lines to express the ups and downs of the terrain. Deng Zilong's mentor was Luo Hongsheng, the top scholar in the Jiajing period. Luo Hongsheng's most famous contribution in history was to compile and draw the famous traditional map "Guangyu Map".

When compiling "Guangyu Map", Luo Hongsheng referred to Zhu Siben's method of "drawing squares in the map" in the Yuan Dynasty, that is, using standard squares to represent the distance on the map, which is a relatively primitive concept of scale.

Deng Zilong and Luo Hongsheng's teaching promoted this method of drawing maps in his army, so the maps used by his troops were much more accurate than other troops. At the same time, the scouts in the army also paid more attention to the role of maps than other troops.

However, the method of "drawing squares in the plot" only solves the problem of horizontal distance labeling, and the vertical drop cannot be expressed in the map of that year. After Deng Kui came back from reconnaissance, he could only draw some triangle symbols on the map to represent mountains, and then simply mark the height. He himself also knew that such an annotation method can only be considered better than nothing, and in many cases, he could only let the main general determine the situation on the battlefield based on his impression or guess.

Now, Su Hao has used such a simple method to express the three-dimensional terrain on a flat map. When Deng Kui first saw this map, he felt a little vaguely. When Su Hao finished explaining, he fully understood this map method and quickly formed a three-dimensional picture in his mind.

"Master Su, you have such a clever method of drawing, why didn't you explain it to my husband earlier?" Deng Kui asked Su Hao.

Su Hao scratched his head and said, "Where does this start? Your husband didn't ask me about this, right?"

"This is really a mistake. If my husband knew that Master Su had this method of making drawings, he would probably have to tie Master Su to our Yunnan." Deng Kui said with a thrust chest and stamping his feet.

"Uh... Is this a bit too savage?" Su Hao said.

Hao Tong was a cautious entry, not as straightforward as Deng Kui. Hearing Deng Kui's words unreasonable, he quickly explained: "Shi Ye Su, Deng Kui is a rough entry and is not good at speaking. Mr. Su doesn't know anything about it. Our army is fighting on the Yunnan border. The terrain in Yunnan is quite complex, with high mountains and deep waters and no three miles of land. When marching, it is difficult to predict the terrain along the way. If the master can teach this mapping method, our scouts can indicate the mountains and rivers along the way in detail in advance, and our army's combat will definitely be like a tiger."

After Hao Tong said this, Su Hao understood. Su Hao knew the complexity of the terrain in the southwest region. In such a region, it is far from enough to marching and fighting in a two-dimensional map. If the terrain cannot be seen in advance from the map, then all combat plans are talked about on paper, and it may not be possible to achieve it in reality.

"Actually, even if you tie me up, it's useless, right?" Su Hao said to Deng Kui with a smile, "I'm covered in iron, how many nails can I make? Yunnan is so big, can you expect me to map the whole province by myself?"

Deng Kui said: "I asked Master Su to go, so of course I didn't ask Master Su to go and test the picture personally, but asked Master Su to explain this technique to our army's scouts. Although I, Old Deng, understand the picture of Master Su, I, if I want to let me draw it myself, I am afraid I can't draw it. Especially the mountain is about a height, Old Deng can only use his eyes to estimate it. I am afraid that it will be dozens of feet for people who go out for foreign businessmen here."

Su Hao said: "You also know that this surveying and mapping is not easy. If you want to learn surveying and mapping, you need to learn a lot of preliminary knowledge. Your scouts in the army may not be able to learn it. However, I have an idea that we can open a surveying and mapping school in the mainland, train a group of surveying and mapping talents, and then send them to the border to draw maps. However, this matter is not something that I, a small county magistrate, can consider. Haven't your Mr. Tu stayed in the Ministry of War? Let him give me a note to the Ministry of War to promote this matter."

"This is a good idea." Hao Tong clapped his hands, "but Mr. Tu has returned to Yunnan and wants to contact him. It will take only a few months to communicate with him.

"There was no hurry to do this." Su Hao said, "It's really necessary to open a surveying and mapping school, and it will take at least half a year to train it. I think, you should help me think of a way to find a very thin pen so that I can draw this kind of map. If you want to draw a military map of 1 to 100,000, the lines on it will be so dense that you can almost see clearly. Think about it, what pen can you use to draw it?"

"This..." Deng Kui and Hao Tong were both embarrassed, and the excitement just now gradually faded. They also realized that if the problem of drawing tools is not solved, this contour map would be difficult to promote.

"Young Master Su, the little girl has a solution, and I don't know if it's feasible." Han Qian, who had been thinking hard, suddenly lit up his eyes and said to Su Hao.

"Miss Han, please speak." Su Hao said.

Han Qian hesitated for a moment, suddenly said with a blushing face: "This is just some of the little girl's whims. I don't know if it can be done, or not to say it out first to avoid insulting Mr. Su's supreme ears. The little girl dared to ask Mr. Su to lend these pictures to the little girl. When I go back and try it first, it is indeed feasible. The little girl will report to Mr. Su, what do you think?"

"Uh..." Su Hao was speechless. It was really troublesome to do things in the little girl's house. She also said that she had a way, but she refused to say it in advance, for fear of being joked. Keeping these pictures at hand is useless for the time being. Since Han Qian wants to borrow, she will let her take it away first. Maybe she can really come up with any good solutions.

Seeing that Su Hao nodded and allowed, Han Qian couldn't help but feel happy. She quickly called her maid Honglian and asked her to carefully wrap Su Hao's pictures to prevent defamation.

In fact, Han Qian already had a good idea about how to make detailed maps, and it would be okay to say it out. But seeing that Cheng Yi was so quick to master the bookkeeping method, she expected that Su Hao would definitely let Cheng Yi do this work in the future, and she seemed to have nothing to do. Now that she could find a way to help Su Hao make drawings, she of course had to cover herself first, and then give Su Hao a surprise.

Han Qian and Cheng Yi each gained something. Seeing that Yao was late, the second one said goodbye. Su Hao and Lu Xiuer sent them out. Su Hao said to Cheng Yi: "Miss Cheng, I will teach you how to keep a bookkeeping method now. I will also ask you to experience it carefully after going back. My business will open, and there will be a large number of accounts to be recorded by then. I also want to invite the wife of the Cheng family to serve as the general ledger. What do you think?"

"Master Su has given me the instructions, how dare the little woman refuse to obey? It's just that Cheng Yi is stupid and he is afraid that he can't take responsibility for the position of general account. It's okay to simply record some accounts." Cheng Yi said.

"Well, let's just keep a simple account, what position will be discussed later." Su Hao didn't want to talk about such politeness with Cheng Yi, so he said generously.

After talking about Cheng Yi's affairs, Su Hao turned to Han Qian again and said, "Ms. Han, the matter of drawing is also important. If Miss Han can really solve this problem, it will definitely be remembered in history."

"How dare you have such extravagant hope?" Han Qian replied with her head down, but she felt happy. She didn't know what was wrong with her. She thought that she could help Su Hao with a thousand things, and she felt a happy feeling.

After seeing off the two daughters, Su Hao returned to the main hall and saw Deng Kui and Hao Tong and Er Ren were still standing there, discussing the matter of drawing a map. Su Hao asked with a smile: "Two, do you think you can also put the flintlock rifle in a while? The map is the most important thing?"

Hao Tong quickly replied, "Why did Master Su say this? The map must be a big deal, and the flintlock rifle is also a big deal. Just now, our brothers started talking here and said that Master Su is very talented, and I guess there are many skills that can be used in our army that our brothers have never heard of?"

"No more, no more." Su Hao waved his hand quickly. Last time he lost his mouth and said a flintlock spear, two door gods Yaoyao squatted at home to urge progress. Jinyao accidentally revealed a contour line chart method, and asked Deng Kui to say harsh words to tie him to the army. If he said something to them, they might really have to take action.

"Don't worry, Master Su, our army has always respected talented people very much. If Master Su really has something to benefit our army, my Mr. Tu has already given instructions, so he can ask for it at all costs." Hao Tong said.

"Don't hesitate to pay a lot of money..." Su Hao's eyes turned. He was short of money now. The coal mine was about to be opened. It would cost a lot of money to dig wells in the early stage. There was still a large gap in the hundreds of taels of silver earned by the promotion of the workshop. If he could borrow the 500 taels of silver promised by Tu Wenhuan from Hao Tong and Deng Kui first, he would solve his urgent problem.

"Two, I have presented the method of flintlock rifle and promised you to teach this method of map surveying. Can you pay the 500 taels of silver you promised to the students first?" Su Hao asked with a smile.

Deng Kui shook his head and said, "Sir Su, so far, the flintlock rifle you mentioned has not started to be made, and the map is just for us to show it, and it is of no use to us. Can you come up with something useful and let us brothers have a reason to give you money."

You are ruthless! Su Hao thought to himself, and he was thinking quickly in his mind about what kind of skills he could use to scare these two soldiers first. After thinking for a while, he seemed to have nothing to do with military affairs. Just as he was about to give up, his eyes suddenly lit up and he couldn't help laughing:

"Since you two have been scouts, have you ever seen a telescope?"
Chapter completed!