Chapter 622 Qin Huaidao looked at Li Jing, he couldn't believe it, what Li Jing showed him before was a map? It's too unclear.

"Okay, you kid still need to experience some training here in the military department, you still don't know much about the affairs of the troops, when you have nothing to do, you can go below to inspect the training of the cavalry troops." Li Jing nodded and said to Qin Huaidao,

Qin Huaidao also smiled helplessly, he really didn't know much about the army, and he really needed to go to the army to see how they trained.

After coming out of the military department, Qin Huaidao still felt that this was not good, so he returned home, designed some things, and then went to the glass workshop, and now the glass workshop and the mirror workshop have been separated.

After Qin Huaidao got over there, he asked them to make convex lenses and concave lenses for themselves, because telescopes are needed, and Qin Huaidao just wants to make some surveying and mapping equipment, and he also needs to produce lenses here.

After Qin Huaidao stayed at the glass workshop for two days, he went to the blacksmith's workshop and the carpenter's workshop and asked them to make some parts.

Three days later, Qin Huaidao finally came up with a batch of telescopes and a batch of surveying and mapping instruments, and Qin Huaidao also made measurements in his backyard and adjusted the parameters.

During the day that day, Qin Huaidao went to the university, selected 20 students in the arithmetic major, and went outside with him to start surveying and mapping, Qin Huaidao was ready to draw a map of Chang'an and 50 miles around Chang'an.

Qin Huaidao took the students to start measuring from the Chengtian Gate of the Imperial Palace, and in the next few days, Qin Huaidao took the students to measure in Chang'an City, and at the same time, he also worked with the students to draw a map of Chang'an City.

Then he began to go outside Chang'an City, and continued to measure, Qin Huaidao divided the students into 4 dials, and began to measure and draw from four directions!

And Li Shimin also knew the news, but he didn't know what Qin Huaidao was doing? So I didn't bother.

At this moment, on the side of the military academy, the first batch of students has been selected, Li Shimin personally selected, and 500 people were selected, with Li Jing personally serving as the chief instructor, Duan Zhixuan, and Tang Jian serving as instructors.

"Your Majesty, those cadets have arrived, according to the training subjects written by Pepin, the minister thinks that it can be expanded, the first year, according to Pepin, all the subjects, those officers need to be trained, and in the second year, they will start training separately!" Li Jing arrived at the palace and reported to Li Shimin.

"Well, when does school start?" Li Shimin asked.

"It's expected to start on July 1st! When the time comes, please come over Your Majesty and His Royal Highness the Crown Prince! Li Jing said to Li Shimin, over there at the military academy, the sacrificial wine is His Royal Highness the Prince, so His Royal Highness the Crown Prince must go.

"Okay, then I and Gao Ming will pass!" Li Shimin nodded and said.

"By the way, do you know what Pepin is doing? I haven't seen Pepin in days! Li Shimin asked Li Jing.

"I don't know, he has finished all the classes on my side, that is, he comes to my house every ten years to do a day, discuss Boping's views on military affairs in this decade, and I will hand over everything to him!" Li Jing also shook his head and said to Li Shimin.

"Well, this kid, I haven't come to me for a while, I found out, as long as this kid is not an official, you want to find his person, it's difficult." Li Shimin sat there and said with a wry smile.

"Well, after all, he is still young, and he may be a little more playful, but I know that he used to walk around Chang'an City with a group of students and some things, and I don't know what he is going to do, and now it seems that he is doing this outside the city. I don't know what to do! Li Jing said to Li Shimin with a smile.

"No matter, let him get it!" Li Shimin waved his hand and said,

After a few days, Qin Huaidao and his students had finished drawing all the maps of Chang'an City and a radius of fifty kilometers, and Qin Huaidao then began to ask them to call students majoring in arithmetic, recruiting 40 people.

Anyway, it's time for them to go on summer vacation, there are 2 months of summer vacation, as long as they don't go home, Qin Huaidao asked them to go surveying and mapping, 20 yuan a day, at the same time, including food and accommodation, Qin Huaidao also sent 4 family soldiers to each of them, specifically to protect them, after all, there are wild beasts in the wild, and the other is to arrange their food and accommodation, and now those students have already been able to surveying and mapping, and their drawing is also very standard.

"Well, yes, that's the map, those maps from before, is that just a joke?" Qin Huaidao unfolded the map of Chang'an City that he had just made, said very proudly, and then took the telescope and prepared to go to the palace.

"Hu Guogong, Your Majesty called you over, saying that you haven't been to the palace for almost half a month, Your Majesty invites you to come and sit!" Wang En saw Qin Huaidao and said to Qin Huaidao with a smile.

"I was about to go to the palace and you came over, by the way, go get some tea and bring it to the princess!" Qin Huaidao said to Qin Da Niu beside him, Qin Da Niu nodded with a smile, and went out,

Soon Qin Huaidao and Wang En rode to the side of the Ganlu Palace, Li Shimin was watching the recital, the battle on the Tibetan side was very stable, and the troops were also advancing in an orderly manner.

Just a few days ago, a group of officers were transferred to the front line, and the officers on the front line were transferred back to the military academy for training, and at the same time, two major generals were also mobilized to the front line to command the operation.

"Your Majesty, Hu Guogong is here!" After Wang En entered, he said to Li Shimin.

"Let him get in!" When Li Shimin heard this, he said to Wang En with a smile, and soon Qin Huaidao came in.

"Erchen has seen his father." Qin Huaidao smiled and arched his hand and said.

"Do you still know that there is a father, this half a month, right? Now if I want to find you, it's difficult, and I want my father to send someone to call you? Li Shimin stood up with a smile and said to Qin Huaidao as he walked towards the teahouse.

"What's the matter, Erchen is busy, he has been busy all this time." Qin Huaidao followed with a smile and said, still holding a map and a telescope in his hand!

"Sit down, what? Put it down and make tea for your father! Li Shimin sat next to him and asked Qin Huaidao to go over and make tea for him.

"Okay, this is a good thing, father, you look at it first!" Qin Huaidao handed over the map with a smile, and sat there drinking tea by himself, Li Shimin didn't know what Qin Huaidao was doing, so he unfolded the map and looked at it carefully.

"Well, this? This one? Li Shimin took a look and looked at the map in shock, the map is very clear, including the streets of Chang'an City, as well as those city walls, and the villages, rivers, forests, and mountains outside Chang'an City, are all clear!

"Hehe, it's clear, Erchen took the arithmetic students to personally survey and map, the terrain around the entire Chang'an City is all on the map, father, you look below, the top is the floor plan, the bottom is the topographic map, that is, how high and how big the mountain is, all the surveys and maps are clear!" Qin Huaidao said proudly to Li Shimin,

Li Shimin then opened the map below and looked at it, and found that he couldn't see it at all, what was this circle?

"Father, this circle is a vertical height of 7 battles, you look here, the distance between the two lines is very close, which means that this piece is very steep, and here, the distance between the two lines is very far, which means that the terrain of this piece is very oblique and smooth!" Qin Huaidao smiled and pointed to the lines on the topographic map to Li Shimin, Li Shimin looked up and down.

"You, you drew it?" Li Shimin looked at Qin Huaidao in shock and asked.

"Well, Erchen took the students to draw it. I asked Wei Guogong before, and he said that there was no such detailed map, so Erchen went to draw one himself.

However, Erchen is not scribbled, you see there are marks below, Erchen has introduced a new unit of measurement, that is, meters, decimeters, centimeters, millimeters, there are schematic diagrams and explanations below, 500 meters to 1 centimeter scale, reduced on the map,

For example, if you look here, the straight-line distance from the east gate to my dim sum workshop is 4 centimeters, that is, 2000 meters, about 4 miles away, and Erchen said it is a straight-line distance.

If you calculate the distance of the journey, you see, this is the road, use the string to compare, in the measurement of the rope, about 3200 meters, about six miles, such a map,

If it is used in the army, we can know how long it will take our army to reach a certain area, what terrain it will encounter, and where there may be ambushes, and we need to send out to reconnoiter in advance. Qin Huaidao sat there and pointed to Li Shimin.

"Good boy, good boy, come on, go and call Li Jing, Zhang Liang, Li Daliang, Tang Jian, Yang Hongli come here, immediately!" Li Shimin stood up very excitedly and said to Wang En, who was standing at the door.

"Yes!" Wang En went out immediately, while Li Shimin continued to look at the map.

"Oh, this is Qinzhuang, Qinzhuang used to be the Weihe Bridge, look, this is here, right?" Li Shimin pointed to the map and asked Qin Huaidao.

"Yes, this is the Weihe Bridge!" Qin Huaidao nodded, it was very clear on the map.

"Well, okay, okay, why did you measure 50 miles, can't you measure more?" Li Shimin took a look and found that he wanted to continue to look farther away, but it was gone.

"This, it's still being measured, just this map, Erchen has been measuring for half a month!" Qin Huaidao said to Li Shimin.

"Oh, it's still measuring, those student unions?" Li Shimin then looked at Qin Huaidao and asked.

"Yes, I taught them, but not everyone can, but you need someone who knows arithmetic to be able to survey." Qin Huaidao nodded and said to Qin Huaidao.

"Uh-huh, uh-huh, this, good, good!" Li Shimin's eyes were still staring at the map, very happy.

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