"What do you think?" Sun Er looked directly at the others.

"I think it's okay, just this sound is a deterrent if you defend the city, but it's too slow." Lu Feng thought for a while and said, "That is, it can be used to defend the city, and if we are in an absolute advantage in attacking the city, we can also use it, but wood has no power, unless the blocked iron pipe can be replaced with stone, and it will be magnified at least several times." ”

"Wait." Huo Gang was a little painful, he stopped it directly, if they continued to discuss, this style of painting would be wrong.

Seeing that their eyes were focused, Huo just said: "I didn't let you see this, think of the previous pot lid, did you think of anything?" Huo Gang felt that he could still rescue these craftsmen and continue to guide them.

The people looked at each other, and then everyone had some confusion.

Obviously, they can't turn around for a while, mainly because they have turned into a fork in the weapon, and it is a little difficult to turn back for a while, Huo Gang is a little speechless, but he is too lazy to sell it.

He said directly: "In this way, think about it, if we enlarge the volume of that teapot, if the water in the teapot is kept boiling, then the steam will be endless?" ”

"If the lid part of the teapot is made into an iron bucket, plug it with a piston, and then make a switch in the lower part that can be turned on, turn on the switch, steam rushes into this pipe, and then jacks up the piston, and the piston rises."

"When the piston rises to a certain point, automatically close the valve below, the steam no longer enters, but enters other places, then the piston will not be neat, and directly down, if the process is repeated continuously, the piston will not be like the flow of water, and the wind, continue to do up and down motion, we convert it into circular motion through gears, so that we do not have a machine that can be operated." Huo Gang simply explained the principle of the entire steam engine.

When Huo Gang finished speaking, these craftsmen widened their eyes, to be able to become the top craftsmen of this era, their own thinking ability is not bad, they just didn't turn a corner for a while, but at this moment, when Huo Gang said this, they instantly figured it out.

"That's right! We have just seen the power of steam, and if we use this power to grind mineral powder and pound steel, it means that our efficiency can be increased many times over! Sun Er said quickly.

"And not only that, do you remember what the leader said about the principle of liquids? If the force fed into the small side of the liquid is propelled by steam, then its force can be amplified many times over, which means that the force on the other end can be very large, even if the steel is directly pressed into a discus. Lu Feng thought of the liquid-related principle that Huo Gang had said before.

"You're right, I'll call it a steam engine, if you can work on it, even if it's larger, but as long as it can provide continuous power, it can power in many ways. Ironmaking, steelmaking, and even textiles, for example, our spinning machines are made of people turning the power wheel next to it, what if that power wheel is driven by a steam engine? Can it drive hundreds or thousands of spindles at once? ”

"If it is used for weaving, if the machine drives the loom back and forth, the shuttle can also become faster, so that the weaving cloth can be done as long as someone watches it, and the speed of the machine is much faster than that of a person!" Now that the steam engine has been proposed, Huo Gang does not recommend telling them all his ideas.

But the premise is that they have to research out the steam engine, steam engine and internal combustion engine by themselves, Huo Gang really has no contact at all, he can only know one principle, as for the follow-up improvement, Huo Gang believes that there will be countless people in the future to improve these things.

"By the way, I remember there was a crossbow here, right?" Huo Gang suddenly remembered something and asked.

"Yes, Chief." Lu Mu immediately replied.

The work of the bow and crossbow is their carpenter's work, Huo Gang had asked them to make some of the crossbow arrows before, all of which were made of the best maple wood, but the crossbow arrows were made, what Huo Gang was going to do, Lu Mu didn't know.

"Fetch one." Huo Gang said.

Huo Zheng over there immediately sent someone to fetch it, and a few minutes later, a crossbow of this era appeared in front of Huo Gang, which was a standard military crossbow. However, its size is not too large, it is only a small crossbow, and there are also large bed crossbows, such as the three-bow bed crossbow in the later Song Dynasty.

But Huo Gang wanted crossbows, naturally not to improve this, but to improve these crossbows in later generations, and it was also the simplest improvement, for example, eccentric wheels! Even if it is not an eccentric wheel, even if it is a concentric wheel, a concentric pulley is installed on each side of the crossbow arm, and then the crossbow string crosses through the pulley of the opposite crossbow arm, which is equivalent to two movable pulleys.

In this case, the force required to pull the crossbow will be reduced to one-eighth of the force, so that the crossbow arm can be thickened to make a stronger bow, and the crossbow arm of this design will rebound faster, and the energy released will naturally be stronger.

Better improvements are not something that Huo Gang can solve now, because it involves the problem of material science, such as modern military crossbows, which are almost all in the world of special materials such as carbon fiber, but the structure can still be improved.

With Huo Gang's description, this time it was not only Lu Mu and them, but even Huo Zheng behind Huo Gang had some eyes lit up.

"You make it first, and when you make it, you can test the power of the traditional crossbow." After Huo Gang's demonstration, he said to them, "If the power is good, you can make a wave in small batches, and such a setup can be installed on a large bed crossbow, so that the bed crossbow will be pulled faster." And when making a large bed crossbow, you can try combining two or even three large bows together to see if you can make a stronger bed crossbow. ”

"Yes!" Lu Mu quickly bowed and spoke.

Huo Gang also wanted to say something encouraging, at this time, a sharp eagle whistle suddenly came from the sky, Huo Gang raised his head and glanced at the sky, Jin Da's familiar voice appeared in the sky again, but Jin Da should be in the Yumen Pass, seeing that Jin Da in the sky had begun to descend at a high speed, Huo Gang knew that there must be something urgent to inform himself.

Otherwise, Jin Da should not come here to find Huo Gang directly, but will go to one of the manors in the industrial city to professionally raise them, which has been isolated, and everyone else is strictly forbidden to approach.

The others naturally heard Jin Da's shout, and they all tacitly walked a few steps into the distance, and soon Jin Da fell straight down from the sky, when Huo Gang was there, Jin Da didn't seem to be so afraid of others, but if it wasn't for Huo Gang, if it wasn't for Huo Gang and the people they knew, they would never have approached.

In the past month or so, Huo Gang has run around several major places in his territory to completely settle these golden eagles, and now there are at least two nests of golden eagles living there in every city, and they are taken care of by special personnel.

Yumen Pass, Yangguan, Industrial City, Black Mountain City, Loulan City, Yiwu City, Iron Mine, a total of 7 places, now Huo Gang has raised more than 70 golden eagles. This seems to be all the golden eagle groups in the vicinity, anyway, Huo Gang hasn't seen a new golden eagle for a long time.

Jin Da and they live in Yumen Pass, in addition to Jin Da and their first batch of golden eagles named by Huo Gang, the following golden eagles are also named by numbers, but the only difference is that their numbers are all in the city of the beginning.

For example, Yangguan is the number of Yang 1 and Yang 2, and as for their specific names, they are handed over to those breeders who usually have nothing to feed them and the intelligence personnel who pass on the information. They can get up if they are willing to get up, and they can pull it if they don't want to get up, anyway, Huo Gang is not interested in coming up with more than seventy names.

In addition to these golden eagles, there are the falcons of the Eagle tribe, and these falcons have also completed their training to deliver letters, but unlike the golden eagles, these falcons can only be taken care of by the people of the Eagle Department. So now the people of the Eagle Department are also divided into seven parts, in seven different cities.

The Saker transports some more general information, while the Golden Eagle is responsible for some of the more important information.

Although the falcon is also a large bird of prey, they still have other birds in the air that can pose a threat to them, but the golden eagle has almost no natural enemies, especially the golden eagle after feeding the spiritual spring water, it is simply the air overlord.

The falling Jin Da landed on the wall next to them very skillfully, Huo Gang walked over and stroked its head, Jin Da let out a few coquettish sounds like doves from his throat, and then stretched out the special letter on his right leg to Huo Gang.

Huo Gang took off the letterbox on its right leg and poured out the note inside, Huo Gang handed the letterbox to Huo Zheng next to him, Huo Zheng immediately took it and tied it to Jin Da on his leg again, and then took out a special water bladder from his waist, opened the leather cap on it, and poured the water inside into the leather cap, Jin Da immediately lowered his head and reached in and drank it directly.

The water in it is naturally spiritual spring water, what Huo Gang prepared for Huo Zheng is used to feed these golden eagles, the water bladder is also specially sewn, and the leather hat on the outside can be used as a leather bowl.

After opening the note and reading the information on it clearly, Huo Gang raised his eyebrows slightly.

The letter was sent by Wu Ping, and there was Wu Ping's seal on it, and the content was that a team of special guests had come to Yumen Pass and Huo Gang needed to go back.