The night before yesterday, Li Xin made the two top-quality water jade into two convex lenses in Yonglefang.

Then yesterday, Li Xin spent another day to draw out the appropriate focal length, then fixed it with a wooden barrel, making the world's first monocular telescope!

Although this telescope is extremely simple, with a magnification effect of about seven or eight times, and is very expensive, it has to be said that this is a unique and rare thing in this era and can definitely make Emperor Chengde feel novel.

More importantly, if this thing can be applied to the army, it means that there are countless clairvoys in the Great Jin Dynasty. Some clairvoys in the military are born with better vision, and they can even borrow this telescope to become a veritable "crosvoys".

You should know that this is an era with extremely poor combat conditions. Generals may even get lost by leading troops. If they can predict the enemy's initiative on the battlefield, they will take many advantages in nature.

However, if this thing needs to be mass-produced in the future, it is necessary to make the glass first. Although Li Xin had never been in contact with the glass industry in his previous life, he probably knew that it was mixed with quartz sand and soda ash. However, he did not have a specific formula. If he wanted to figure it out, it would take at least several years or even more than ten years to figure it out slowly.

At present, the telescope made of natural crystal that he carries can be said to be unique.

Of course, the Royal Family of the Great Jin Dynasty has the world. If Emperor Chengde likes it, he can make a lot of it even if he uses natural crystal alone.

The process of the Emperor's Holy Birthday is that all officials go in and present congratulations first, and then the Emperor accepts the worship of all officials. In the evening, a banquet will be held in the palace to entertain civil and military officials.

At this time, the Seventh Prince and the civil and military officials had already walked into Changle Palace, and Ji Lingxiu also sorted out her clothes and prepared to go in.

However, there was no place for Li Xin in the Changle Palace hall, so Li Xin could only wait outside the hall. In desperation, Captain Li handed a wooden box in his arms to the Ninth Princess and whispered: "Your Highness, this is the gift I have prepared for Your Majesty for you. When Your Majesty asks, you will say that this thing is called a Qianli Mirror, which can be seen very far."

Ji Lingxiu took the wooden box with a little vague understanding, turned around and entered Changle Palace.

Li Xin was standing in the shade of the Changle Palace Gate and waiting. He knew that it would not take long before someone would summon him inside.

Because this thing is very magical, once Emperor Chengde asks about the truth, the Ninth Princess will "offer" Li Xin.

Of course, this is not a bad thing, but a great thing.

Li Xin is now just a vine that depends on others. If he is dependent on the Seventh Prince, he will only be a vine for a long time in the future. However, if he can enter the sight of Emperor Chengde, he may become a tree by himself. Even a very thin tree is much better than a vine.

After closing his eyes at the entrance of the main hall for half an hour, a little eunuch hurriedly ran out of Changle Palace, looked around and asked sharply, "Who is Li Xin?"

At this time, in addition to Li Xin, there were some people waiting outside the hall, most of whom were not qualified to enter the venue, just like Li Xin.

Li Xin's face was calm and he took a step forward.

"The lower official is Li Xin."

The little eunuch bent down at Li Xin: "Personnel Li, Your Majesty summons you, hurry up and go in with me."

Li Xin nodded, tidied up his clothes, followed the little eunuch, and stepped into Changle Palace.

It was not the first time Li Xin came to Changle Palace Hall. The last time he came, he had just returned from southern Xinjiang. Emperor Chengde asked questions, so Li Xin understood the rules he should have. After entering the hall, Li Xin took a deep breath and knelt on the ground: "Li Xin, Yulin Guard, come to the Holy Emperor, the Holy Emperor will live forever."

This sentence was said by Ji Lingxiu in the morning, and it was a greeting to the emperor for his birthday.

At this time, Emperor Chengde was playing with a wooden tube in his hand, and he put it on his eyes from time to time to look at the distance. Princess Qinghe was standing beside the emperor, with a somewhat cramped expression.

In this way, it is not difficult to guess what happened just now.

Emperor Chengde played for a while, looked at Li Xin kneeling on the ground, and smiled: "Get up and talk."

Li Xin stood up and still lowered his head.

Emperor Chengde put the Qianli Mirror on his right eye, closed his left eye, and pointed the mirror at Li Xin under the imperial stairs. He could easily see the young man's hanging hair. Emperor Chengde put down the Qianli Mirror and was amazed: "It's indeed a wonderful thing. Xiaojiu just sent it up, and I still don't believe it. Li Xin, how did this thing be made?"

Emperor Chengde was an extremely smart emperor. After seeing this thing, he immediately thought of useful things.

military!

The Jin Dynasty now has a peaceful and peaceful appearance, but there are hidden dangers on both sides of the north and the south, especially in the south. If this thing can be used on a large scale, then in a war, it would be like a normal person bullying a blind man and took all the initiative.

Li Xin said in a deep voice: "Your Majesty, this thing must be made of the best water jade, and it is extremely expensive. Princess Qinghe spent a lot of money to make such a thing out of filial piety, hoping to make Your Majesty happy."

Emperor Chengde put down the Qianli Mirror in his hand with some disappointment, turned his head to look at Princess Ninth, and laughed: "Xiao Jiu is intent. If you go back with something in the palace, you can't let my little daughter suffer."

Ji Lingxiu hurriedly saluted Emperor Chengde and smiled and said, "Father is holy birthday today. It is normal for children to give some things. It is good that the father likes it. My daughter dare not ask for anything from the father, so that the mother will not talk about her daughter again."

Emperor Chengde narrowed his eyes, reached out to touch the Ninth Princess' head, and laughed and said, "Okay, I can't bear to be filial to you, I'll take this thing down."

At this time, the princes and the princes gave the gifts, and the civil and military officials had not yet begun. Emperor Chengde turned to look at the officials under the imperial stairs and said calmly: "Continue."

The eunuch Chen Ju stepped forward and sang loudly: "Greetings from all officials."

So the process continues.

Li Xin bent over and said, "Your Majesty, I will leave."

The one who can stand in this hall is at least a fifth-rank official. There is no Li Xin’s place here, so he naturally has to go out and wait.

Emperor Chengde narrowed his eyes, pointed to a position in the corner, and said lazily: "You just stand there and wait, don't go out, I have something to do when I look for you later."

Li Xin hesitated for a while and lowered his head and said, "I obey the order."

At this moment, all the civil and military officials in the hall set their sights on the young man.
Chapter completed!