Huo Gang didn't want to make a powerful free forging hydraulic press, those high-pressure water guns and the like can't be made at the moment, and they don't show it, he just wants to tell these people this principle, which means that Huo Gang will have a great advantage in lifting heavy objects.

Soon, a cross-section of the U-shaped device created according to Huo Gang's requirements appeared in front of Huo Gang, this thing was made of pig iron, and it took about an hour before and after, this device was composed of two barrels, and the left barrel was probably thinner, similar to a human arm.

The right side is thicker, and the right side is about 10 times that of the left.

After filling the inside with water, the bottoms of the two barrels are connected together, and a simple piston mechanism is made on the faces of both barrels.

The pressure is given to the piston on the left side, and the water surface on the right side naturally rises, and two heavy objects are placed on the two pistons, and then Sun Er and they saw a magical scene, adding an object weighing about 1 kg to the piston on the left, and placing an object of 10 kg on the right side, the height of the liquid is actually the same!

If you add weight to the left side, you don't need to add too much, and the water surface on the right side starts to rise gradually.

Although it is said that the piston on both sides is constantly leaking water because of the poor degree of sealing, these have already explained many problems.

They did a simple experiment, and then Huo Gang told them the theorem again, so that they could understand it a lot.

When Huo Gang explained it to them, Sun Er and the others already understood what this thing could do, "Chief, this means that we can lift very heavy objects with very little force!" But before Sun Er could speak, Lu Feng next to him quickly spoke.

Sun Er next to him looked at Lu Feng with some resentment, can't you let me say it?

"Okay, don't be like this, you can call this thing hydraulic or water pressure, because the liquid in it, whether it is oil or water, as long as it is liquid, it is okay."

"Now that we've said that today, let's talk about another thing, and I'll see if you can work it out." Huo Gang took a deep breath, since he talked about hydraulics, then there is another thing Huo Gang simply said together, as for whether it can work, then Huo Gang doesn't know, but what if it can work?

"Boss, please!" All the craftsmen said in unison, although they craftsmen didn't understand it, but the things that Huo Gang showed them today seemed to have opened a new door to this world for them again.

"Go, find a kettle and make a fire here." Huo Gang pointed directly to his current ground and said. If there is another modern person, it is estimated that he will immediately know what Huo Gang is going to do.

Someone immediately ran over to do this, and soon a simple stove was set up in front of Huo Gang, on which a copper kettle was hung.

After putting water in it, light a fire below, and then start waiting for the water to boil, and when the spout began to bubble, Huo Gang directly asked people to completely seal the spout.

After sealing the spout, as the water inside began to boil, the lid that was originally very tightly covered was directly lifted out with a "bang", because the lid was stuck with the body of the pot, so it did not fluctuate up and down, but was directly blown by the steam.

"Do you see anything?" Huo Gang looked at them and asked.

If it was before, even if these craftsmen saw such a thing, they didn't care at all, because they had already been accustomed to it in life, but after seeing the things that Huo Gang showed them just now, these craftsmen immediately thought about it.

"Chief, you're talking about the power of steam?" An abrupt voice interrupted everyone's thinking, and it sounded directly in the crowd, Huo Gang immediately followed the sound and forgot about it, this was a young man who looked to be twelve or thirteen years old, and he was standing on the periphery of the crowd at the moment.

"Who are you? What is your name? Huo Gang looked at him with some surprise and asked.

"Looking back, this is my child Tian Zhun, who is learning carving with me." Tian Zhong immediately bent down and saluted.

"Tian Zhun has seen the leader." The young man also hurriedly bent down and saluted.

"Yes, how do you know I'm talking about the power of steam." Huo Gang looked at Tian Zhun with a smile and asked.

"Looking back at the leader's words, I was just thinking, what you let us see is definitely not as simple as boiling a pot of water, just like what you said before, what you let us see is the truth of the existence of all things in this world, we all know this daily boiling water, who turns it on, this steam can push the lid of the pot and make a loud noise, we have all seen it. But none of us ever thought about why steam has so much power, and it was only after listening to you that I thought about it. Tian Zhun immediately said respectfully.

"Oh? So what else comes to mind? ”

"Looking back at the leader's words, I have seen the aunts on the other side of the canteen steam steamed buns for us, and there was steam coming out of the steamer all the time, but there was no steam on top of the steamer, I wondered if it was because there were many small holes on the steamer, and the steam bristles quickly dissipated with those small holes, so it could not hold up the steamer. And because the boss of the kettle has the spout sealed, it gathers more and more inside, and finally the lid is completely opened! Tian Zhun said with a serious face.

"Papapa" Huo Gang couldn't help but applaud the little guy, "That's good!" ”

The other craftsmen looked at each other, they all knew that since the leader was so happy, it was obvious that Tian Zhun was right.

"Chief, I wonder how powerful this steam is?" Sun Er thought about it and asked with some curiosity.

"Wouldn't you know if you tested it?" Huo Gang didn't answer directly, but said strangely, how much power does steam have? Hehe, Huo Gang, who came from a thousand years later, didn't know how much power steam had, anyway, he knew that even if it was the nuclear power of the bull fork in later generations, the essence of nuclear reaction turning into power was nothing more than boiling water, boiling water, and boiling water!

"You go make a cast iron pipe that is sealed at one end, and we'll test it directly." Huo Gang said very simply.

"Yes!" Sun Er, they immediately went to get busy.

Casting an iron pipe, and it is not so regular iron pipe, in fact, it is not difficult, even if it is a regular iron pipe, it is not difficult, but the quality of the iron pipe wall is not very good, Sun Er and they directly use the abrasive forging method.

They had already fired a lot of these pipes before, mainly by firing a pottery vessel first, and then the pottery was fired into a cylinder, and then there was a pottery pillar in the center of the cylinder. After firing, pour molten iron directly into the middle.

In this way, the wall of the fired iron pipe is not too thin, but it can be used.

Of course, after the molten iron is cooled, the pottery can be broken directly, and the pottery pillar in the middle of the iron pipe is directly poked out with a tool, and the efficiency is relatively slow. But these things are ready-made, so it's fast.

As for sealing one end with molten iron, it is simpler, the fired iron pipe is red-hot and erected there, and then pour some molten iron into it, just plug the buttocks, and it is not a high-precision thing.

Half an hour later, Huo Gang got what he wanted, this is an iron pipe about one meter long, one end has been completely sealed, Huo Gang asked people to pour a scoop of water into it first, and then let Lu Mu cut a log column slightly thicker than the mouth of the iron pipe, and directly drove the log into a considerable section of the iron pipe to complete the seal.

The next task was simple, find a bracket, stuff the end of the iron pipe into the log, and aim it at the two-story wall next to the industrial city, and then start the fire on the other side.

The raging flames began to burn, everyone quieted down, they didn't know how powerful this steam was, to be honest, Huo Gang didn't know, maybe the iron pipe wall was too thick, about ten or twenty minutes later, suddenly the mouth of the iron pipe standing there suddenly let out a huge "bang" sound!

The huge sound directly startled everyone standing seven or eight meters away, and the butt of the iron pipe obliquely against the soil went directly into the depth, and the fire that continued to burn around the iron pipe became sparkling because of the vibration of the iron pipe, and the brick wall less than 2 meters away made a dull loud roar, and a huge hole appeared directly on the brick wall.

The surroundings instantly became dusty, and everyone a few meters away was stunned and frightened! If they hadn't known what was in there, everyone would have thought it was thundering in the sky!

The iron pipe was still spewing white steam, and it seemed that the wood still couldn't lock the pressure directly and completely inside.

Sun Er and the others rushed directly to that place after coming back to their senses, where the natural brick wall they first rushed through was located, although this brick wall was not made of cement, but directly smeared with mud, but looking at the hole made by the human head, Sun Er and they were stunned.

Seeing their stunned expressions, Huo Gang couldn't help but smile, I'm afraid you don't know anything about air pressure, this power is small, if the tires of a big truck are blown up in the future, the power will ...... It's not much different from explosives.

At this moment, Huo Zheng had already sent a soldier to climb over the wall directly and pick up the wood and scattered bricks on the other side.

The wood was embedded in a brick and had been deformed by impact.

"This ...... Chieftain! It's an artifact! Can we turn this thing into a weapon? Installed directly on the city walls? If the enemy comes to attack, if we strengthen the sealing ability, the range can be hundreds of meters away?! Sun Er came back to his senses and said loudly with his eyes lit up.

"(⊙o⊙)..."Huo Gang was stunned.

I'm going, I'm thinking of the steam engine, not the steam cannon! What the hell is this weapon, how is this unfolding a little wrong!

~~~~~~~

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