The spies put on civilian clothes, pretended to be businessmen, and went to the Baihua Building with Xia Hongsheng. Xia Hongsheng began to secretly look for the figure he saw yesterday, and he needed to point out the person to the spies so that they could track and investigate him. There is another group of people who have already begun to investigate the background of Baihualou.

I have been waiting there for most of the day, and I haven't seen that figure appear again, but Xia Hongsheng didn't think that he had seen the wrong person last night, and everyone waited for a long time, but they still found nothing.

Could it be that the man found out yesterday too? Or do you say that you are a cup bow snake shadow and really recognize the wrong person?

In desperation, Xia Hongsheng also dismissed a few more people and let them go back.

After getting up, he was hesitating whether to go up to find the Moon Immortal, when he heard a shout: "Young Master Xia!" ”

When I looked back, I saw that Pan'er next to Yuexian came over and said, "I saw Childe earlier, but when I saw Childe who seemed to be talking to someone, I didn't dare to come forward to disturb." ”

"Oh, there's something. But now we're done. Xia Hongsheng nodded: "What about the Moon Fairy Girl?" ”

"Miss is not in the boudoir, and she was invited to the Han Wang's Mansion today." Pan'er said to Xia Hongsheng: "Qiao'er also went with her, the slave maid was unwell, Miss was considerate of the slave maid, so she let the slave maid stay and rest." ”

King Han?! Li Ke? Xia Hongsheng was taken aback, but then reacted again, now Li Ke is no longer the king of Han, he has been changed from the king of Han to the king of Shu, and the current king of Han is the original King of Lu Li Yuanchang.

Somehow. I heard that Yuexian was invited by Li Yuanchang. Xia Hongsheng's heart was a little unhappy. Li Yuanchang is not a good thing. Relying on the fact that he is a royal clan and the half-brother of Li Lao Er, he is domineering on weekdays, which has caused many people to be dissatisfied, and even Li Lao Er hates him very much. But because his father Li Yuan is still living in the Taiji Palace, and Li Yuanchang often pleases in front of Li Yuan, he can only simply turn a blind eye.

In the second year of Zhenguan, Li Yuan still lived in the Taiji Palace. Although Li Shimin handles government affairs in the Taiji Palace, he still needs to live in the main hall of the East Palace.

Knowing that Yuexian was not there, Xia Hongsheng talked to Pan'er for a while, and then left with Qi Yong.

When the two went home, they saw a small guy waiting for them at the door of their house, and when they saw that the two had gone back, they hurriedly ran over.

"Childe, you're back. Someone from home came to the house, saying that it was from the Ministry of Works, and he wanted to see you for something important. It's been a long wait! The little guy ran to Xia Hongsheng and reported to Xia Hongsheng.

Xia Hongsheng was stunned: "Ministry of Industry? Do you know who your name is? ”

The little guy shook his head.

Xia Hongsheng walked in quickly. When I came to the main hall, I saw a person who looked kind and kind sitting there drinking tea, and when he saw Xia Hongsheng entering, he stood up and said to Xia Hongsheng with a smile: "Xiahou, you can be regarded as coming back, if you don't come back, I will go to the army to look for it!" ”

"It turned out to be Yan Shangshu!" Xia Hongsheng arched his hand and said: "There are some important things in the military camp, so I have been dealing with them until now before I come back, so I asked Yan Shangshu to wait for a long time, and I hope that Yan Shangshu will forgive his sins!" ”

"Haha, it's just a joke, Xiahou Mo has to take it seriously!" Yan Lide waved his hand: "It's the official, without informing him in advance, he rashly came to visit, but it was abrupt." ”

"Yan Shangshu, please take a seat!" Xia Hongsheng invited Yan Lide to sit down, sat down himself, and asked, "But I don't know why Yan Shangshu came to the Humble House today?" ”

But seeing a look of embarrassment flashing on Yan Lide's face, he said to Xia Hongsheng: "Alas, I feel guilty about this matter......

This makes Xia Hongsheng curious, this is Yan Lide, an engineer, architect, arts and crafts artist, and painter of the Tang Dynasty, whose character is as reliable as his works, but today he feels guilty?

"But what?" Xia Hongsheng asked curiously.

"Hey, this matter has to start before Xiahou went to Shuofang!" Yan Lide said to Xia Hongsheng with a guilty face: "Xiahou Ke still remembers that at that time, you presented a treasure to Your Majesty through General Cheng, which can make people see the scenery hundreds of steps away in front of you?" ”

Xia Hongsheng nodded clearly: "Yan Shangshu is talking about telescopes!" Why, I remember that after presenting it to His Majesty, there was no letter. ”

"Exactly!" Yan Lide said to Xia Hongsheng: "At the beginning, His Majesty secretly summoned me into the palace, and ordered me to open up another place outside the Ministry of Industry as a prison, and in the future, I will specialize in making similar things, saying that these things are of great use in the army, but they are important in the army, and they must not be known to outsiders. Even the craftsmen in it have chosen those who have no home to come, so that no one can coerce their families and reveal their practices. Therefore, for Xiahou, it is a mud cow entering the sea, and there is no news. ”

This time it was Xia Hongsheng's turn to be dumbfounded. The next moment, I was dissatisfied with Li Lao Er in my heart. He even opened up a separate prison with a degree of secrecy that was several levels higher than that specialized in the production of these things, and he didn't even notice him! This should let him know, after all, this thing was made by him, and Xia Hongsheng felt that no one in this Datang seemed to have a greater possibility of making advanced things than himself.

No wonder Yan Lide would say guilty, it turned out that he did it secretly without himself!

Also, what the hell is the military aircraft workshop, is this name super inappropriate?! Where to put the name of the Military Aircraft Department?! Xia Hongsheng slandered in his heart, but naturally he couldn't say it, so he just asked rhetorically: "Then why did Yan Shangshu tell me today?" ”

Yan Lide cleaned up his expression and explained: "Now the military machine workshop is researching and making Xiahou's telescope, and we have also made the first batch of things, but it can reach the level that Xiahou made, only one-tenth of twelve. And the speed of production is extremely slow, His Majesty is already in a hurry to use it in the army, it is really urgent. Helplessly, after the old man reported to His Majesty, he obtained His Majesty's consent and specially came to inform Xiahou, and hoped that Xiahou would not be surprised, and for the sake of the Tang Army, he would inform the old man of the skills here! ”

As he spoke, Yan Lide actually stood up and bent down to Xia Hongsheng and made a gesture.

Xia Hongsheng hurriedly jumped up from the chair like a spring on his buttocks, dodged to the side, and quickly helped Yan Lide up.

"Why should Yan Shangshu be like this! This matter is tested in my Datang Army, I will definitely fully support it, where will there be any surprise? Xia Hongsheng said to Yan Lide: "Please also ask Yan Shangshu to inform me of the situation in detail!" ”

Yan Lide nodded, and then told Xia Hongsheng about the problems encountered in the manufacturing process one by one.

After Xia Hongsheng listened, he knew that the problem they encountered was actually not a very difficult problem to solve, and the main problem was that the power of the lens was not uniform, because some of the lenses made could see close, and some could see far. In addition, there is also the neglect or inadequacy of the middle orthographic system, which leads to the telescope being biased, or simply reversed, upside down.

After knowing the reason of the problem, Xia Hongsheng had confidence in his heart, so he said to Yan Lide with a smile: "I already know the problem that Yan Shangshu said. The higher the thickness of the lens used - that is, the glass lenses - the higher the thickness in the middle, the farther you can see, and the thinner the middle, the closer you can see, which needs to be measured to a fixed thickness, so that the things made are consistent. In addition, the reason why what you see is upside down is due to the lack of a positive image system between the two lenses, that is, to make the picture upright. This has to start with the refraction of light, but it is not half a sentence that can be explained clearly. ”

The kind of telescope mentioned by Xia Hongsheng was called a Kepler telescope in later generations, and it was composed of two convex lenses and a prism in the middle as an orthographic system. In fact, there is a simpler Galilean telescope, just get a tube and press a convex lens and a concave-convex mirror at both ends, and you don't need the orthographic system to see the upright scene. However, the field of view of this telescope is small, so it is not suitable for military use.

"Yan Shangshu, please wait a moment!" After Xia Hongsheng finished speaking, he ordered someone to go to the study and bring his painting box, then took out the charcoal and began to draw drawings on the paper.

"Huh?" Yan Lide let out an exclamation. When Xia Hongsheng was drawing drawings, he approached to look, but saw a few pieces of paper next to a pile of tools in Xia Hongsheng's painting box, and portraits were being drawn on them, not only exclaimed.

Yan Lide took out those portraits from inside, and the boss with his shocked mouth open could stuff a goose egg into it!

"This, this, this...... Xiahou, this is the little guy who opened the door for the old man just now! Yan Lide gasped, and pulled off a few beards by the way: "This, this is Your Majesty!" ”

Xia Hongsheng raised his head and looked at Yan Lide, but saw that his hands were trembling and clenching the pieces of paper tightly, which looked much more out of shape than when he talked about the telescope just now.

"Oh, it's just graffiti, it's a joke for Yan Shangshu!" Xia Hongsheng was scared, look at what we have surprised this Tang national player! However, you can't say that.

Yan Lide is proficient in painting, and like his younger brother Yan Liben, he is extremely good at painting. It is precisely because I am good at it that I am so shocked and surprised when I see a portrait so close to a real person.

"This ...... This technique ......" Yan Lide's lips trembled a little: "It's no different from a real person!" …… Xiahou, this technique ......"

"Oh, that's called a sketch." Xia Hongsheng grinned and said, "Yan Shangshu, let's talk about the telescope first." As for this technique, if Yan Shangshu sees it, we will have time to communicate in the future. ”

As soon as he heard Xia Hongsheng's words, Yan Lide immediately smiled, the wrinkles on his smiling face expanded, and he nodded vigorously: "Okay!" (To be continued......)