"Why is he still running?" Seeing that Liu Yang ran out for about a hundred meters, and still didn't stop, the emperor looked at Yu Zhiqian with some curiosity, could it be that gunpowder is really so terrifying, and it is not complete to run such a long distance?

"Father, the power of gunpowder is huge, Liu Yang can't say it's safe now!"

The emperor looked at Yu Zhiqian, as if the prince was not joking, and some believed what Yu Zhiqian said, maybe the gunpowder was really powerful, right?

Time passed second by second, about another twenty seconds or so, Liu Yang panted and found a big tree, leaned his back against the tree, poked his head out and glanced behind him, and after making sure that he had run to a safe area, he breathed a sigh of relief, and at the same time covered his ears with his hands, waiting for the next explosion.

"Haven't you detonated yet?"

After waiting for about half a minute, the gunpowder had not exploded, and the emperor glanced at Yu Zhiqian with a little displeasure.

"Boom!"

A huge explosion sounded, followed by three or four explosions in a row, even if it was a few hundred meters away, Yu Zhiqian still felt a little uncomfortable in his ears, not to mention the emperor and the guards around him, many guards were so frightened that they lay directly on the ground, and many people were frightened, even the students who often heard the explosion were shocked.

In this experiment, Yu Zhiqian took out the latest black powder, compared with the previous black powder, this time the black powder exploded, the sound was louder, and the power was also greater.

After the explosion, Yu Zhiqian shook his head and looked at the city wall in the distance, most of it had collapsed, Yu Zhiqian couldn't help but shake his head, the power is still not enough, this city wall is just the scale of the city wall of an ordinary state capital, compared to the city wall of Chang'an and other heavy cities, this city wall is still a little lighter, but it seems that it should be enough for foreign people.

Yu Zhiqian was also taken aback by the thoughts in his mind, why did he blow up the city wall of Chang'an if he had nothing to do?

"Father, are you alright?"

After seeing the results of the explosion, Yu Zhiqian looked at the emperor beside him, and the emperor stared at the half-destroyed city wall in the distance in a daze, and didn't even hear Yu Zhiqian's words.

"Father, are you alright?"

Yu Zhiqian shook the emperor gently, and the emperor reacted and shook his head slightly: "I'm fine, that was the power of the gunpowder explosion just now?" ”

"Yes, father, that is the power of gunpowder explosion, within a hundred meters, people and animals are lifeless, in addition, gunpowder can easily destroy the city wall and hit the morale of the enemy!"

Hearing Yu Zhiqian's words, the emperor nodded and agreed: "Well, it's true, the two armies are fighting, if such a huge explosion suddenly occurs, the enemy army will be defeated!" The emperor looked at the ruined city wall in the distance and said to himself, and then looked at Yu Zhiqian: "Go, go with me and have a look!" ”

Yu Zhiqian grabbed the emperor: "Father, wait a minute, there were a few explosions just now, but the ministers didn't hear it clearly, so let people talk about it and check if there is any unexploded gunpowder!" ”

The emperor did not object to Yu Zhiqian this time, and soon a few guards cautiously rushed towards the location of the city wall, to find out whether all the gunpowder buried just now had exploded, and after about five or six minutes, after making sure that all the gunpowder canisters had been detonated, Yu Zhiqian took the emperor, thinking about the broken city wall not far away, and walked slowly.

"Is this gunpowder expensive?"

The emperor looked at Yu Zhiqian and asked in a low voice, this gunpowder is indeed very powerful in terms of military effect, but if the cost is too high, no, even if the cost is too high, we must go all out to produce this weapon, with this kind of weapon, Goguryeo, hehehe!

Goguryeo has always been the emperor's heart disease, in the last hundred years, Goguryeo, the overall reform, learning from the Yutang Empire, a remote country of projectiles, actually developed decently, and gradually gave rise to the heart of disobedience, the previous dynasty had an expedition, Goguryeo relied on the fortified city, and dragged the war into the winter, and the Yutang Empire army, which was not adapted to the cold in the north, had to withdraw.

Since then, Goguryeo has become more and more arrogant, in recent years, even the tribute has been cut off, and even began to hinder the tribute of some small countries in the north to the Yutang Empire, the emperor has long wanted to destroy Goguryeo, but there has been no good way, so it has been delayed again and again, and now the appearance of gunpowder has made the emperor see hope, destroy Goguryeo in one fell swoop, and pacify the north.

"Father, the raw materials of gunpowder are very cheap, but it is more troublesome and easy to make mistakes when making them, so the output is not high now!"

"How long will it take to prepare the gunpowder needed to pacify Goguryeo?"

Yu Zhiqian was stunned for a moment, he didn't expect the emperor to have such a problem, Goguryeo, Yu Zhiqian also knew about this country, but he didn't expect that in the emperor's heart, he couldn't wait to destroy this country.

"The pacification of Goguryeo gunpowder can be prepared within half a year, but the father, in fact, there is no need to be so anxious to pacify Goguryeo, there is a large piece of fertile land near Baishui in the northeast Black Mountain, I can send troops to occupy that piece, and then start to garrison troops, so that the soldiers can get used to the weather in the northeast, and then it will be easy to pacify Goguryeo!"

Yu Zhiqian had studied the pacification of Goguryeo before, and the biggest problem was similar to the Tibetan problem, that is, an environmental problem, the area of Goguryeo was frozen all the year round, the summer was short, and the time suitable for the Yutang Empire to go on the expedition was only a short period of March.

But once the soldiers of the Yutang Empire adapted to the weather of Goguryeo and besieged the city all year round, Goguryeo was not a problem, after all, it was only a small country, with few soldiers and little food, not to mention the siege for several years, just a year, Goguryeo would basically collapse from the inside out.

The emperor didn't hear the rest of the words, but was very concerned about Yu Zhiqian's casual remark just now, there is good land in the northeast, and stared at Yu Zhiqian: "Prince, you said that there is good land in the northeast, how many are there?" ”

Yu Zhiqian really doesn't know how big the black soil in the Northeast is, but it will later be called Beidacang, which is also the will of the national key granary, and he thought for a while and slowly shook his head: "I don't know, but it shouldn't be less than the number of good fields in Guannai, and the Northeast is black soil, and the land is very fertile, although it can only be planted once a year, but the yield should be much higher in Guanzhong!" ”

Hearing Yu Zhiqian's words, the emperor's eyes became red again, and the last time they became red, it was because the emperor knew that there was endless food in Nanyue, and sure enough, in ancient times, no matter what his identity was, his dedication to land and food was not something that later generations could understand.

The emperor kept knocking on the side of Yu Zhiqian's side to knock on the question of the black land, Yu Zhiqian didn't know much, only knew that there was good land in the Northeast, and it would be called Beidacang in the future, the emperor was repeatedly sure that there was enough fertile land in the Northeast, so he no longer asked, and began to plan in his heart, how to occupy and develop that piece of land, if what Yu Zhiqian said was true, plus the grain of South Vietnam, the empire really would never have a famine.

When the group came to the bombed city wall, the emperor also recovered his normal color, and began to observe the blown up city wall, the emperor was still the prince, he had also led the troops to go on the expedition, and simply checked the wall built by Yu Zhiqian, it was not a city wall that cut corners, and the understanding of gunpowder was more intuitive.

"How much gunpowder is used for this?"

Liu Yang stood up and saluted the emperor: "Your Majesty, four jars of gunpowder were used in this test, and the total should be about a pound of black powder!" ”

After Yu Zhiqian heard this, his face sank, this guy hadn't changed his bad habits for so long, and stared at Liu Yang in front of him: "Speaking of specific numbers, how many times has this palace said that scientific experiments should be accurate, what is your approximate amount?" ”

Hearing Yu Zhiqian's reprimand, Liu Yang realized that he had said the wrong thing, and respectfully saluted again: "Your Majesty, four gunpowder canisters were used in this experiment, and a total of 580 grams of gunpowder was used!" ”

Accurately said the number, Yu Zhiqian nodded with satisfaction, and the emperor looked at the city wall: "Can this gunpowder only be buried under the city wall to have power?" ”

The emperor has already calculated the use of gunpowder in his mind, if it is necessary to bury manpower under the city wall, the effect of gunpowder should be reduced, after all, burying gunpowder requires a lot of manpower, and there may be huge casualties.

"Father, this is just a way to use gunpowder, now we are working on a delayed gunpowder, gunpowder is more stable, such a Hu ah, can be projectile through a trebuchet, but the gunpowder explodes on the surface of the city wall, the threat to the city wall will not be too great, but through the stone thrower, the gunpowder can be directly thrown above the city wall, which can cause huge casualties to the defenders of the city wall!"

After hearing this, the emperor nodded, if the gunpowder could really be thrown, it would indeed be a huge pressure on the defenders, at least he didn't have a good way to deal with the gunpowder.

"This gunpowder is good, continue to study, but gunpowder is dangerous after all, remind students to pay attention to safety, they are all my pillars of the dynasty!"

The emperor praised a few words, and the surrounding research students immediately became excited, hearing that the emperor praised us as pillars, those who laughed at themselves in the past had to shut up, they were pillars, not to study any strange skills.

Although the Yu Tang Empire is now open, and the people have begun to accept the development of scientific research, there are still some old stubborns, who think that the study of gunpowder, the study of science, etc., is a strange and obscene skill, and cannot be put on the stage, these people are still a lot, most of them are some old men in Taixue, the rise of Tsinghua Garden is a huge challenge for Taixue, especially the topic of Yu Zhiqian's last scientific examination, which made them feel the crisis.

The emperor was very satisfied with the gunpowder visit, and praised the people who studied gunpowder, Cheng Chumo became eager to try, he believed that his glider could also be developed by the emperor, and at the same time he also had a new, bold idea for the use of the glider, and was ready to experiment later.

"What's next?"

As soon as the emperor sent a message, Cheng Chumo jumped out: "Your Majesty, you can visit my glider below!" ”

"Okay, Cheng Guogong, I'll take a look at your son's glider!"

This sentence was said to Cheng Yanjin, Cheng Yanjin has been a lot more low-key since he came to the academy, and it is a little inconsistent with this guy's character, but Di Renjie slowly swallowed and told Yu Zhiqian the reason, this Cheng Yanjin is really a second person, what does this guy say, although he looks very arrogant, but he is very persistent about some things.

For example, although Cheng Yanjin doesn't like those civil servants very much, often quarrels with some civil officials, and is even ready to do it, but every time this guy goes to a private school or college, he will be abnormal, just like now, if it weren't for the emperor to speak, Yu Zhiqian almost forgot Cheng Yanjin, according to Cheng Yanjin's usual character, he should have jumped out a long time ago.

"Your Majesty said that it was funny, the dog's stubborn works are still well taught by His Royal Highness the Prince!"

Since Cheng Chumo entered Tsinghua Park to study, Cheng Yanjin's attitude towards Cheng Chumo has undergone a 180-degree change, Cheng Yanjin himself is a rough person, although he has read, but he is known for his bravery, his sons and daughters have inherited his strong martial arts genes, but on the way to study, but ......

When Cheng Chumo and Cheng Xiang were very young, Cheng Yanjin tried his best to let the brother and sister study, but unfortunately, in addition to some basic knowledge, this brother and sister only grew strength, not other things, but when Cheng Yanjin followed the emperor out on tour and knew that his son had entered the academy to study, and seemed to be learning well, the whole person immediately became excited, and he almost set up a flowing water seat to celebrate......

In the final analysis, this guy Cheng Yanjin is still in awe of knowledge, maybe because this guy lacks this thing......

The appearance of Cheng Biting Jin gave Cheng Chumo a certain amount of pressure, but after Cheng Chumo still gave the emperor a salute, he began to prepare, compared to the danger of gunpowder, the emperor could not go in to observe, and the glider that observed Cheng Chumo could not only walk in, but also touch the east and look west.

"This thing can fly?"

The emperor glanced at Cheng Chumo and asked curiously.

"Back to Your Majesty, the glider can't fly into the sky, but the glider can make people fly for a short period of time, and the flight altitude is not very high, and Your Majesty will know later!"

Cheng Chumo's preparation was very fast, and after pushing the glider to the highest slope, a pilot with more than a dozen flight experience and rich flight experience who had not fallen to his death sat on the glider and began to prepare for gliding.

"Your Majesty, the glider is about to take off, let's get out of the way a little!"

Cheng Chumo commanded on the side, he was confident that he didn't know how many generations of gliders, he would definitely be able to fly, and the flight distance had also made great progress.

The emperor nodded, took a few steps back, and looked at Yu Zhiqian: "What's the use of this glider?" ”