Seeing that many generals showed curious looks, Yang Xi smiled mysteriously, and did not answer immediately, but motioned for the generals to follow him to the city.

The training of the special training team has not been interrupted, but Yang Xi did not personally preside over today's training, and he ordered those training team leaders to be in charge of training after assigning tasks. The training in the past few days is still mainly based on physical fitness, and everything must be done step by step, and you can't be too anxious.

Only those who are physically qualified can be selected for subsequent training, and those who are very good in all aspects are left behind in special training. After a rigorous assessment, it would be good to have 100 qualified sergeants to stay in the end.

Yang Xi's idea is that after one to two years of gradual training and actual combat, he will have a special operation capability in his hands, and these fighters can perform many special tasks, which can make future battles better and can also help him a lot.

Without the advanced equipment of the special forces of later generations, many tasks may not be completed, but Yang Xi believes that many tasks that are difficult for ordinary people to imagine and complete are entrusted to them, and the soldiers are also capable of completing them.

He is not in a hurry, and the training of the special training team will be taken slowly, and he can't ignore military affairs, and every day he has to spare a certain amount of time to listen to Gao Shi and other generals in charge of training report on the affairs of the Tongguan Town Army, and he also has to ponder his own "small inventions."

What Yang Xi is most eager to make now are telescopes and gunpowder. He made the telescope himself, and with the results, he was ready to let his men take charge of the gunpowder. He has selected dozens of craftsmen and sergeants with flexible minds to form a research and development team to be responsible for research and production. It's just that the raw materials needed have not yet been transported to Tongguan, and the development of gunpowder can only begin in a later time.

**The danger is too great, Yang Xi doesn't want to encounter an accident in the development process, not to mention that he is a marshal who commands 100,000 troops, just tell his subordinates to do these things, he just needs to give them methods and techniques.

What he wants to show the generals today is the telescope that he has made in the past few days and can already be used in practical use.

When he returned to Chang'an, Yang Xi found a transparent crystal with a very good color in the West Market, and asked the shopkeeper to polish it into a concave and convex lens according to his requirements. However, the guy in the store is not very good at polishing skills, and many lenses are still a little blurry, and only a dozen pairs of more than 30 pairs can be used. Yang Xi chose a convex lens and a concave lens, tested the approximate focal length in the sun, and fixed them in two soft iron ring barrels, the diameter of the ring barrels is slightly different, the two barrels can be stacked and rotated with each other, and the small one can be set inside the large one, and the convex mirror is used as an eyepiece. What Yang Xi is going to show to the generals is such a simple-made telescope, monocular.

After walking to the top of the city, Yang Xi took the first telescope in human history carefully wrapped from the hand of Yang Dong, the leader of his personal guards, in the astonished gaze of the generals, and placed it next to his left eye, facing the Hantong Pass in the distance, and slowly adjusted the focus.

Finally, a clear scene of Hantong Pass appeared in the field of vision.

The Hantong Pass is being renovated, like a large construction site, and the busy people and sergeants at the head of the city can be clearly seen in the telescope, and the faces of those standing in the sunlight can probably be seen clearly. After looking at it for a while, Yang Xi took the telescope away from his eyes with satisfaction, and smiled at Sima Gao Shi, who was standing beside him, full of curiosity, but endured without asking, and said: "General Gao, you try to see the repair of Hantong Pass through this thing." ”

"Yes, Marshal!" After Gao Shi agreed, he carefully took the telescope from Yang Xi's hand, looked at it according to Yang Xi's instructions, and slowly adjusted the focus.

"Huh?! After just one glance, Gao Shi let out a startled sound, took off the telescope in disbelief, rubbed his eyes and looked at the Hantong Guancheng Tower in the distance. After looking at it a few times, I picked up the binoculars again, put it in front of my eyes, and looked at it a hundred times more seriously than just now.

After looking at it twice, he put down the object in his hand again, and then put it in front of his eyes again.

After looking at it a few times like this, Gao Shi asked Yang Xi on the side with suspicion: "Marshal, what kind of magical thing is this, how can you see it so far, even the appearance of the sergeant on the tower of Hantong Pass can be seen clearly?" You are...... How is it made? ”

"This thing is called a telescope, and it was inadvertently made by Ben Shuai one morning when he saw the scene being zoomed in and magnified through the dewdrops!" Yang Xi took over the monocular that he had worked so hard to make from Gao Shi's hand, and explained with a smile: "It took a lot of effort for Ben Shuai to use the polished crystal lens to make a telescope that can zoom in on distant scenes, haha!"

After Yang Xi laughed twice, he handed the telescope to Wang Sili, who was standing beside him and was more curious than anyone else, "General Wang, you try this thing and see if this telescope made by Ben Shuai is useful in battle!"

Of course, Wang Sili had already guessed that this thing was very wonderful, and when he heard Yang Xi say this, he immediately took it impatiently, and looked at the scene of Hantong Pass through the telescope according to the appearance of Yang Xi and Gao Shi just now. "Huh?!" After just one glance, he couldn't help but exclaim.

Looking into the distance through this cylindrical thing, the scenery in a long distance can be seen clearly, and the scenery is shortened a lot of distance. Wang Sili even saw a patrolling sergeant on the upper floor of the Hantong Pass City and yawned a long time.

You must know that the Sui Tong Pass City where they are standing is nearly a thousand steps and about three miles away from the Hantong Pass Tower where the sergeant is standing. But through this magical thing, you can distinguish all the facial features, it's amazing, Yang Xi who can make this thing is amazing!

"Marshal, this thing is really amazing, very useful, with this kind of telescope that can see far away, it can play a great role in marching and fighting, before the opponent discovers the enemy's situation, you can make preparations one step ahead, it is likely to be the key to victory!"

"That's right," Yang Xi nodded in agreement with what Wang Sili said, "If every general wears such a pair of binoculars, then when commanding a battle, he can detect the enemy situation before the opponent and prepare early, which is very useful." ”

While speaking, the telescope has been passed to other people, Pang Zhong, Li Fude, Liu Guangting, Li Chengguang, Tian Liangqiu, Lu Chongben and other generals have successively observed this magical thing made by Yang Xi, and everyone was amazed when they saw it. They were all battle-hardened generals, and of course they understood the usefulness of this thing when marching and fighting. Everyone has an expectation that they can have one.

Who wouldn't want to own something like that?

"After the commander improves, he will order the ordnance supervisor to produce a large number of binoculars, and strive for a telescope for everyone!" Yang Xi's words made the generals suddenly excited. Seeing the admiring look on his face when the generals looked at him, Yang Xi's vanity was a little satisfied.

Of course, he wanted his father Yang Guozhong to order the military weapons superintendent to make a large number of telescopes, but the imaging quality of the telescopes produced now is not very good, and the gap between them and the military telescopes used in his later generations is not ordinarily large, but it can also be used immediately.

More complex combination lens telescopes can only be made later, and it is better to get the glass out first.