Not to mention the microscope, it is estimated that it is enough to make a magnifying glass now.

The kind of work of polishing mirrors is still done by the old craftsmen and those who make jade.

Otherwise, this effect simply cannot be achieved.

With just two convex lenses, you told me that you wanted to make a telescope, which is a lot of trouble. Let's not talk about the material problem on this, just how to determine the focal length, how much the length is needed, this is all needed to determine by yourself.

Unless it's made to stretch and contract, then it's relatively simple. At least you don't have to adjust the focus yourself.

And I still have a lot of good things, and there are many things that I can play with, and as long as I can make telescopes, this kind of glass, especially fully transparent glass, will be regulated.

Li Hang also understands this truth, no matter what era it is, once something can reach the strategic level, this kind of thing will inevitably be hidden, and the weapons of war in this era have always been kept secret, just think about the huge cannon that bombed Constantinople, the Hungarian engineer was cast in the cannon room, he has no freedom before this thing goes to the battlefield, even if he goes to the battlefield, this engineer will not be able to go out casually near the cannon room for the rest of his life.

This kind of thing can be done by a country, and it has nothing to do with any country or system, human rights, or dishes, and it is of no use.

Take out this, Li Hang is ready to prevent this kind of transparent glass from circulating, but it doesn't matter, when the time comes, you can mix some other things into it, and then let it fire out glass of different colors, even if it is not this kind of transparent, it is definitely popular.

Think about what it would be like to make a window out of almost papier-mâché now, and then you can almost start making something else.

Coal!

Li Hang has been working on the idea of this thing for a long time, but for the time being, everyone has not yet understood this secret, so this kind of thing has not been used on a large scale in coal mines.

And now that the emperor is coming, then the refining of pork can be put on the agenda, as long as the soap is made, you can refine glycerin, and even other things, and you can even use some other methods to make and preserve a small part of nitric acid!

At that time, not to mention nitrate and sulfuric acid, the two types of acids that are useful for industry, just one nitroglycerin, it will be worth it.

What's more, there are other things in his hands, and he can even make silver nitrate by making nitric acid, and then use the displacement reaction to make a mirror.

The mirror should belong to the artifact level in this era.

"At this time, don't say what a leaf and a bodhi, one day, I will let you see that world!"

Li Hang laughed, there will be such a thing as a microscope in the future, and as long as his own science and technology tree is right, it is easy to say anything.

took a large group of children back to the house slowly, and Li Hang took the time to go to Zhao Feilong's.

A large piece of red earth was built next to Ying Yun's fiefdom as a military camp, and this alkaline land could hardly grow crops, so the barracks could only be built on it.

As soon as he passed, Li Hang could see that Zhao Feilong was different from his father.

Looking for Haikuo to be a soldier for so many years, arranging the barracks is called a fan, which can be said to be an orthodox contemporary soldier, but this Zhao Feilong arranges the barracks casually, but there are many soldiers patrolling around.

Obviously, this one was fought on the battlefield, and for him, this kind of camp that is easy to disassemble and has a certain defensive ability is the most suitable for grassland warfare, because on the grassland, there is not so much wood for you to build a camp.

And they don't dare to linger at will.

Li Hang's eyes narrowed. What did Zhao Feilong let himself do at this time?

"Stop!"

The two soldiers picked up the spears, which were already held with both hands, and if Li Hang wanted to break through, they would stab them directly.

"My name is Li Hang, you can go and ask your general, he asked me to come!"

"Okay! Don't move the hydrogen station here, I'll go tell the general! After saying that, he called a soldier on the side and told him to go and tell him.

After a while, Zhao Feilong pulled it out.

"Li Hang! You're here, come in! I happen to have something to discuss with you! ”

Zhao Feilong was very distressed, to be honest, there were two purposes for the new army here, one was to communicate with Li Hang, after all, he made the tactics of war, and the other was about the expansion of this new army.

First of all, we must be cautious in the matter of expanding the army, and we must select some family members who are quite innocent. This is only one thing, and the second is to let him refer to his own training methods.

Because when the people who led before had a clear purpose, their destination was actually clear.

To what extent?

In the past, burn and kill, take away what can be taken and kill what can be killed, and burn what can't do anything.

This kind of combat is almost devastating, even if you have to leave, you have to set a fire in the meadow.

It's disgusting to death.

However, for this kind of operation, he saw the effect.

Judging from Li Hang's approach, even in the end, they have no way to confront each other head-on, and it is impossible for this kind of lightly armed troops to confront others.

He wanted to solve this problem.

After watching Zhao Feilong take him to the military tent, he took out a military book and put it in front of Li Hang. "This time, we have to expand our army, not to mention, but also to come up with a way to be able to attack the other side, and I have another question, if we want to fight the steppe people head-on, how are we going to fight?"

"Can't fight! Unless you can truly become a real uniform cavalry! ”

The real modern cavalry is really armed with organization and discipline, and the uniform action, the super execution power similar to the legendary order and prohibition, can allow it to form a whole suppression of those cavalry with superb horsemanship.

Li Hang glanced at this military book, which basically said that the troops need to be careful about what they need to be careful in combat, and in the training of soldiers, although they also emphasized the prohibition of orders, to a large extent, it was not about how to practice, but a requirement in the traditional sense.

The soldiers were asked to do what they could do, and they wrote some simple schemes.

Although this kind of military book is not systematic, and there are not many actual combat cases, this is already an heirloom of the Zhao family.

And Li Hang also discovered that a lot of this book is about city defense and breaking harassment logistics.

As for the others, there are not many others, this may also have something to do with their experience, after all, the Zhao family era was all on the border.