Three Kingdoms: Me! Liu Zheng! Queen Jing of Zhongshan!

"Here is our latest cement product, let me show you.

Ma Jun said, and asked people to take military bows and crossbows and shoot at cement slabs about two centimeters thick.

"Ding~"

After the crossbow hit the cement slab, it did not shoot through, but only scattered some of the places where the cement slab hit, and then was bounced and lay quietly on the ground, waiting for someone to pick it up.

"(⊙o⊙) Wow!" Everyone

was extremely surprised, even Liu Zheng

! You know, in this era of cold weapons, bows and crossbows, especially military bows and crossbows for defending cities, are big killing weapons

! The power is very huge, even if you shoot at the city wall, you can directly insert it into the city wall, but now in front of everyone, such a powerful bow and crossbow can't shoot through a cement slab less than a finger thick!

Liu Zheng's eyes lit up, and he actually made such a high-hardness cement!

"Have you ever measured the minimum thickness of the cement board to resist the attack of the bow and crossbow?"

If the cement board made of special cement researched by Ma Jun has the same or not too weak defense power as the same weight of steel.

Then Liu Zheng can use this cement board as a process in the transition to the steel age.

For example, it is used for

the safety defense of his own carriage! Nothing is more important than his own safety!

Now Liu Zheng's special carriage is made by Liu Zheng at his special request, and the materials in front of the carriage are made of multi-layered materials, which are not afraid of fire, and the bow and crossbow are at most hung on the carriage with ten thousand arrows, and there is no way to completely break through.

It greatly protects the safety of Liu Zheng's outing.

But there is also a very big problem

, that is, the cost is too expensive! If you want every important person to have one, it will be too worthwhile!

The income and income are extremely disproportionate!

Therefore, Liu Zheng also let people build such a car, thinking that when the steel technology is developed, it will be rebuilt again, but due to the restrictions of the times, Liu Zheng does not know much about this technology, and the production technology is not high.

In addition, there are few iron ores to be found, and then there are many places where steel is needed.

Liu Zheng didn't force himself to take out the iron that was not enough to make this protected carriage.

"Nope. Ma Jun looked at Liu Zheng and shook his head at a loss.

For a while, I couldn't figure out why Liu Zheng asked himself this.

If you want to use it to build a city wall, wouldn't it be better to build it thicker and thicker? Why

test how thin

it is? Is there any point?

But Ma Jun is also a smart person, he didn't directly ask why, but asked Liu Zheng: "Lord, what aspects do you need to test?"

The speed of hardening, what are the shortcomings, the strength of the thickness and thinness, all you can think of, test them all once, in short, in a word, you have to know this thing clearly!

" Listening to Liu Zheng's words, Ma Jun nodded thoughtfully: "Okay!"

"You go to test, my lord, I will take you to look at the other side to see the radio equipment group."

Ma Jun turned his head and let him go to the test, and then took Liu Zheng to continue to inspect the logistics department.

"This is our radio group, a few days ago, you sent us the direction of research and development, in fact, we have been studying it for a long time.

Ma Jun took out two long cylinders connected by wires and showed them to Liu Zheng.

"This is the only device we can use with sound by hand at the moment, and it doesn't work very well.

Liu Zheng looked at the simple device in Ma Jun's hand like a wire connecting two water glasses, and fell silent.

"Why did you get the phone out?" Liu

Zheng slowly walked up to Ma Jun, picked up one of them, looked at Ma Jun and asked.

"Just pick it up and talk?"

"Huh...... No.

Ma Jun blushed and shook his head in embarrassment.

Turned around and pulled out a hand-cranked generator.

Looking at this thing, Liu Zheng was also stunned

! Damn!

I came to the logistics department today, why did you shock my three views

? Are you a traverser, am I a traverser?

"Odd and even unchanged?"

"Look at the quadrant

of the symbol!" Liu Zheng stared at Ma Jun with an inquiring look on his face to ask for a code, and then Liu Zheng grabbed the answer.

"Young master, I will do this too, I don't need to test the horse, haven't you handed it over in the academy?"

"Grass! I forgot!" Liu Zheng scolded and scolded, and the air was angry and punched twice.

"Huh~" Liu Zheng vented, took a deep breath and asked Ma Jun: "This thing, you also look at it from the academy?" "

That's right, although you haven't drawn a picture, but I asked a lot of students who have heard you describe it, and I got it out according to everyone's retelling."

Ma Jun pointed to the small generator in his hand and said, then he put the wire on the line between the two telephones and began to shake.

"Lord, one of you, you can hear each other when you go farther away.

Ma Jun struggled to shake the small generator.

Liu Zheng nodded, and asked Liu Zheng to take the other one, two people in one corner.

"Hey, hey, can you hear me?"

Liu Zheng held the speaker microphone in the corner of the side to feed him, and then put the microphone on his ear to listen to Liu Zheng's response.

"Hey...... Feed...... Listen...... See ......"

The sound of the microphone reached Liu Zheng's ears, and Liu Zheng's voice was intermittent, and he even lost some voices.

But I can really hear the voice

! This simple telephone equipment has become a cross-era thing for a while

! It has directly brought this epistolary era in the late Eastern Han Dynasty into the era of wired telephones!

"It's okay, Ma Jun stop." Liu Zheng heard the voice, his excited heart calmed down, and he saw that Ma Jun was still shaking the generator tirelessly, and spoke.

"Whew. Ma Jun heard Liu Zheng's voice telling him to stop, so he dared to stop and wiped the sweat on his forehead.

Because this thing is not big, and then it is slowed down, there is no electricity, and it can't bring the sound of the phone, so Ma Jun needs to shake it quickly without slowness.

It's not a good job, if it's a one-time burst of shaking, anyone can do it, but it's long-lasting.

Not everyone can do it.

"Yes, Minister Ma's position is not in vain, have you ever thought about why it's intermittent?"

Liu Zheng clapped his hands and praised Ma Jun, and then began to ask heuristic questions.

"I've wondered why, and I'm guessing it's the electricity you mentioned.

Ma Jun patted the generator on the table and said.

"Hahaha! You're quite smart, since you have a guess, you go and study it, as long as you continue to study, there will be results!" Liu

Zheng laughed, no longer talking about this topic, but turned his head to ask about the radio equipment.

"Radio equipment, what stage has it reached?".