"Brother, why is your face swollen?" Li Zhang went to Xu Ping and looked at him and asked in a low voice.

Xu Ping touched his face and said helplessly: "I have grown teeth recently. I don't know where it happened. I've been swollen these two days."

"Your teeth have grown at the end for several months, why can't you finish it? Brother, I advise you to find a doctor to take a look. The imperial physicians in the palace are really capable."

Xu Ping nodded: "When I finish my official duties today, I will go to the doctor to see you."

With Xu Ping's current identity, the imperial doctor also had to cure him, and he was not worried about not being able to find a good doctor. But Xu Ping was unsure. The imperial doctor's methods could cure his teeth. To cure his disease, the key is to be able to do ruthlessly and pull out the trouble-provoking teeth. However, the imperial doctor was used to treating the people in the palace and was used to being cautious, but he was afraid that he would not have the courage. But if he did not look for famous doctors such as the imperial doctor, Xu Ping, the parade doctor on the street, would not dare to look for them.

While talking to Li Zhang, he entered the Da Nei and headed towards Chongzheng Hall.

Today is the day when Xu Ping and Wang Yan go out to patrol the river. Several ministers and the censors of the Censorate, the three envoys, etc., are all here, and they want to give a final conclusion to the matter. The dispute between Xu Ping and Wang Yan will be revealed today. The matter has been struggling for so long, and it should be concluded.

But from the time he returned to the capital, Xu Ping's tooth started to get into trouble again. I don't know where the stimulation was, and the inflammation in his mouth became. Xu Ping looked at the mirror at home. The end of his mouth was swollen like a bun, and he felt heartbroken with his hands. He had been so hot that he dared not eat it, cold that he dared not eat it, and even harder food, and could only rely on drinking porridge to survive. Now that parents, wife and children are not in the capital, Xu Ping himself is very worried, and he just resists it day by day, waiting for the inflammation to disappear one day.

When we arrived at Chongzheng Hall, we performed the ceremony as if we were in the hall. When we entered the hall, we saw that Wang Yan and others had already arrived.

Zhao Zhen above still gave him a seat as usual and gave him tea soup. How could Xu Ping dare to put the hot tea soup into his mouth? The emperor could not push it to the side, and he endured the discomfort. After taking a sip, his mind was already buzzing.

Fortunately, the light in Chongzheng Hall was not good, and others could not see the change in Xu Ping's expression. The little yellow door who was serving him saw Xu Ping grinning, and knew that he was afraid that he was feeling uncomfortable in his body, so he took it down immediately.

After removing the tea soup, Zhao Zhencai said loudly: "A month ago, Guo Zi, the judge of the Sansi Salt and Iron Department, asked to dig a canal and lead the Luo River into the Bian River to replace the Biankou where the water was diverted from the Yellow River. He ordered Xu Ping, deputy envoy of the Salt and Iron Department, and Wang Yan, deputy envoy of the Ministry of Revenue, to go to Beijing for investigation. Recently, he returned to Beijing to report. I dare not do so by myself in national affairs. The two of them will report to the ministers separately!"

Everyone received the order together.

Lu Yijian, who was attending the seat, said: "Xu Ping, you are the one who is on this trip. Should the river and canal be opened or not, come forward and explain in detail."

Xu Ping stood up, bowed and said with a scepter, "Your Majesty, my grandfather, the place where the river and canals are dug is complicated, and it is afraid that it is difficult to explain clearly in words. I have made a sand table here, which looks more clear. Please tell me to the sand table."

Zhao Zhen was right and asked Xiaohuangmen to take the sand table Xu Ping placed outside the hall.

Xu Ping did not think so troublesome, but this time Wang Yan and himself were killed and did not dare to be careless, so he urgently made the sand table in the second half. In order to hurry up, the sand table was made of mud, showing the terrain from Biankou and north of Songshan Mountain south of the Yellow River, and the area along the Yellow River was particularly exquisitely made.

Uncovering the silk cloth covered by the sand tray, Xu Ping said: "Look at it, this is the terrain from Biankou to the area where Luoshui River estuary is located. Mountains, rivers, hills and hills are all in it. Different areas, whether the underground is rocks or sand, are marked clearly with different colors. The black ones are rocks and the white ones are sand. The darker the color, the harder the underground is, and the more difficult it is to dig, and the lighter the color is, it is easier to dig. Soaking and Songshan south of the Suo River have nothing to do with the excavation of river canals, so there is no coloring and no need to worry about it."

Lu Yijian and Wang Zeng looked at each other. Every time Xu Ping talked about such serious things, he always had to do some strange tricks. He drew pictures on the blackboard, and this time he even moved out the sand table. These methods are really troublesome, but they can be seen clearly and easily understood. To be honest, although the few people here have been officials in the court for many years, few people understand these professional knowledge. Just by speaking, it is probably amazing to be able to listen. How can we really distinguish the pros and cons? The benefits of doing this are also very obvious.

Zhao Zhen was on it, stretched his neck and looked for a while, and where could he see clearly when he was far away? He simply stood up and said to the ministers under his seat: "Everyone should get up and go to the front to see clearly."

Lu Yijian and Wang Zeng had already known that this would be the result. After hearing Zhao Zhen's words, they stood up with their ministers.

When I arrived at the sand table, I saw clearly that the sand table was extremely exquisitely made. It was not only lifelike, but also had a distinct color. It also had a benchmark on the edge of the sand table.

Mei Xun looked at it for a while and asked Xu Ping who was standing: "Xu Waijian, what are the two benchmarks used for? Why are there only a few lines engraved on it? Could it be that the numbers in the net can be marked?"

"Bachelor, it is used to mark the number of miles. The small grid on this benchmark is one mile, and the entire sand table is made of this proportion. A small grid is a flat ground and a small grid is a high school."

Mei Xun looked at Yan Shu beside him and smiled, saying, "Can you really have the same sand table as the actual geography? You can tell at a glance whether the distance is far or near, the mountains are high or low?"

Xu Ping nodded: "That's right!"

After hearing this, the people around him changed their expressions and their expressions became solemn. The sand table was not just a sign, but was actually made according to proportions. Not to mention how the river channel was so conscientious, it would be amazing to just make such a sand table. China has already had a drum truck, and the number of miles on the flat ground is easy to calculate, but the height of the mountain is not easy to measure. Although we always say which mountain is so high from the "Shan Hai Jing", it is not something that anyone can do.

Xu Ping did not prepare for this in advance, and did not have special tools. He was actually very rough. The benchmark he took was the water surface of the Yellow River, and there was a height difference between the upper and lower reaches of the Yellow River. In addition, the earth is circular, so there is naturally a curvature influence. The errors of these two items are brought from the bottom of the bone.

Without optical instruments, we can only rely on the method of using vertical rods to pull ropes and then measure the angle and calculate it. We can only take fewer marking points, mostly based on estimation.

But no matter what, this is already the most exquisite three-dimensional topographic map of this era.

(I used to be unable to sleep, but now I can't wake up. I've been in a daze for nearly forty hours, but I still feel dizzy...)
Chapter completed!