"Boom!"

A thunderbolt flashed through the dark clouds, and the electric light illuminated the otherwise dark night sky with a glimmer of light.

The dark clouds were so low that they seemed to be within reach.

The electric light is like a dragon, wandering in the dark clouds.

Finally, another thunderclap fell, and the rain the size of beans began to fall.

"Order, take off all your armor and put it under the beacon tower, and you must not wear armor without the arrival of the enemy!"

On the city wall, Lu Chensheng was looking at this seemingly extremely huge thunderstorm, and then suddenly thought of something, and shouted at the soldiers on the side.

The soldiers were stunned when they heard this, and they didn't know what Lu Chensheng meant.

Those who were soldiers, they were ordered to stand guard no matter what the circumstances, they were not allowed to take off their armor and put down their weapons.

"Take a snapshot and let the rest do the same!"

Cheng Xue reacted quickly, and after being reprimanded by Bai Yi before, he also knew that no matter what the situation was, since it was ordered by Lu Chensheng, then just do it.

The order was quickly passed on, and watching the lightning swim away in the dark clouds, Lu Chensheng breathed a sigh of relief.

Truth be told, he really forgot about it.

Standing on the city wall patrol on this mountain range, encountering such a thunderstorm, holding a spear or something in his hand, isn't that looking for death?

This thunderbolt struck down, and a bad one would really kill people.

Chengxue, who had finished the order, came back soon, and she no longer had any armor and blades on her body, and she was ready to continue guarding.

"In the future, whenever it rains, let the soldiers lay down their swords, unless there is an enemy attacking, they will do so."

The mountains are already high, and with the addition of the city walls, the chance of being struck by lightning is much higher.

Chengxue on the side nodded, wondering why she did this.

Lu Chensheng saw the other party's thoughts, and explained without waiting for the other party to ask.

"These things are easy to cause lightning in the sky to strike you, and you don't want to see soldiers, and suddenly they are slashed, right?"

Yes?

Cheng Xue was stunned, she didn't expect Lu Chensheng to explain like this.

Wearing armor is easy to cause thunder and lightning to fall from the sky, what is the principle of this?

"Boom!"

Just when Chengxue was stunned, the flagpole on the city wall in the distance was indeed sturdy and was struck by lightning.

When Chengxue saw this scene, she was immediately startled.

"This is called tip discharge, under a strong electric field, the tip of the conductor will gather a large amount of charge, and after reaching a certain value, it will start to discharge, and you will not be allowed to wear this armor and other things, that is because these things are iron tools, conductive."

Erhu and the others on the side started to take notes at this time.

After learning this lesson, they saw that the sky was full of dark clouds, and they came to the city wall to see this phenomenon.

I didn't expect it, but I really saw it today.

After seeing this scene, Erhu and the others were immediately satisfied.

I don't think I'm wrong about what I learned on paper, but if I can see it with my own eyes, it's a little different.

Chengxue sounded dizzy, but he probably understood that he was carrying a blade or something, and he was prone to being struck by lightning during a thunderstorm.

"Tell the soldiers to be able to squat and squat, away from that flag."

It was the flag of Xinghan City, but I didn't expect it to play the role of a lightning rod.

"Okay, let's all go down after reading it, it's not safe here."

Lu Chensheng looked at Erhu and the others, waved his hand and said.

Erhu and the others saluted respectfully, and then turned around and left.

Cheng Xue's face was a little weird when she looked at this scene, these children, after being taught by Lu Chensheng, became more and more incomprehensible.

Sometimes I look at them and come to test the bow and arrow, saying that it is to test the force of the bow and arrow, and then put in the initial velocity of gravity or something, and calculate the foothold of the arrow.

But what shocked her was that in the end, these students actually calculated correctly!

After that, it was also calculated how much the elevation angle was, the landing point of such a test.

At that time, Cheng Xue only felt that something in his mind had collapsed, it turned out that this bow and arrow could still be calculated like this?

Now the other party has come to this city wall again, just to see the lightning strike the flag this time? The other party still knows why he hit this flag.

These students, one by one, look so scary.

Cheng Xue thought of that time and talked to Lu Chensheng about this matter, and Lu Chensheng directly waved his hand to indicate that it was nothing.

Calculating the foothold of the bow and arrow or something, it really doesn't matter.

It's really amazing, after a plane crash, you can calculate where the black box of the plane is likely to fall, but there is a lot of knowledge to be used in this.

I remember that there was such a powerful person in later generations, and he did it.

In addition to this, mathematics can be used in many other areas.

"Your students are so powerful, I'm afraid you don't even know how this lightning is formed, right?"

Cheng Xue calmed down and said jokingly.

"Yes, this is not particularly difficult knowledge."

When Lu Chensheng heard this, he responded directly.

This fluttering sentence made Chengxue stay in place in shock.

Is that lightning in the sky? It is impossible for a person to go to the sky, and he can only look at it on the ground, so how can he know where this lightning came from?

Why does this man seem to know everything?

Cheng Xue's face was full of horror.

Lu Chensheng didn't pay attention to it so much, still frowning at the moment, looking at everything in the distance.

It doesn't look like this rainstorm will last long, but who can say for sure?

In case it gets bigger, after a long time, the flood in the Great Cangguo will come.

I don't know what the situation of the Great Cangguo is now.

It stands to reason that there is still some distance between Xinghan City and Dacang Kingdom, and it rains a lot here, and there may not be heavy rain anywhere on the other side.

On the contrary, it may be a bright spring.

It's just that he doesn't know the situation in Dacangguo, and Lu Chensheng can only wait.

Lu Chensheng sent someone from the Great Cangguo side, and any news will come back as soon as possible.

After staying for a while, the rain poured down, and Chengxue hurriedly urged Lu Chensheng to go back.

Lu Chensheng herself said that it was not safe to stay here, where did she dare to let Lu Chensheng stay here more, what if something happened to her?

Moreover, even if there is no thunder and lightning, it is not good to be in the rain all the time.

Lu Chensheng didn't mean to stay longer, and quickly returned to his residence under the urging of Chengxue, Xiaoyu boiled hot water for Lu Chensheng to bathe and go to the cold.

And before Lu Chensheng had finished bathing, the rainstorm outside had also dispersed, and the smell of dirt rose outside.

"Outside the plug is outside the plug, and finally there was a rainstorm, and it didn't rain much before it stopped."

Lu Chensheng looked at this scene and shook his head, but he thought about what happened to the canal.