Wang Yuqing is like a studious primary school student, listening carefully to Zhao Huan's explanation.

"First, it's the black powder I told you, the power of black powder is more than ten times that of this silver powder, if you can successfully develop that black powder, you only need a gunpowder bullet the size of a fingernail, and the effect is even more powerful than now, you said that at that time, will you soon be able to refine the control of the fire system?" Zhao Huan said to Wang Yuqing.

When Wang Yuqing heard what Zhao Huan said, she tugged at her hair vigorously and said, "Oh, Your Majesty, this is too difficult, you have to give me a little more time." ”

Zhao Huan wanted to give Wang Yuqing a little motivation, so he said: "In addition to the black powder, there is also yellow powder on it, the power of that thing is more than a hundred times that of the current silver powder, it only takes a small point to produce a violent explosion, that is the ultimate goal you need to study." ”

"Is there any explosive more powerful than black powder?" After Wang Yuqing heard this, he grew his mouth in surprise, but his eyes were glowing, he now has an inexplicable fanaticism about the study of this black powder, maybe when you dive into the study of something, there will be a very strong sense of inner satisfaction when the research is successful.

"Well, it's unlikely that this will be done in a short time, but you can change the angle to increase the power of this powder keg." Zhao Huan picked up the fire and said to Wang Yuqing: "Since the power of the explosion can't be reached, let's add more explosives to it." ”

"But then the powder bullet gets even bigger!" Wang Yuqing said with a frown.

"Well, then cast this fire control more thickly and long, the power is not enough, let's make up the quantity!" Zhao Huan said.

"Isn't that more inconvenient for the soldiers to carry, should several people carry it together? The soldier couldn't use it. Wang Yuqing shook his head and said.

"When you think about things, don't be so dull, this thing is so heavy, why do you have to let the soldier carry it, you can press two wheels on it, so that the soldier can push it, and even walk with a horse!" Zhao Huan said.

"Oh, yes!" Wang Yuqing slapped his head and shouted: "Such a simple truth, why didn't I think of it before." ”

Zhao Huan was secretly happy in his heart, you didn't expect it, I have more than a thousand years of wisdom in my head, many things may seem very simple now, but for the Song Dynasty at that time, it was very far-sighted, and what Zhao Huan said was equivalent to pointing out a direction to Wang Yuqing, which could make him take a lot less detours.

Wang Yuqing admired Zhao Huan more and more, and felt that Zhao Huan knew everything.

"How many fire commanders like this are there now?" Zhao Huan asked.

"Since the last time I received your notice from Your Majesty, I asked the blacksmith to hurry up and make it, and now I have prepared five thousand fires and tens of thousands of gunpowder bullets!" Wang Yuqing said to Zhao Huan: "Your Majesty, don't worry, I will immediately let those blacksmiths adjust according to Your Majesty's requirements!" ”

Zhao Huan nodded and said, "First transport these prepared fire systems and gunpowder bullets, I will be useful." ”

After communicating with Wang Yuqing, Zhao Huan suddenly realized a problem, an important reason restricting the development of firearms is the backwardness of smelting technology, and it seems that it is still necessary to innovate smelting technology.

So Zhao Huan went to find Xie Huan, who was the master of the craftsman.

Although Xie Huan is not very old, he is one of the most famous craftsmen in the Song Dynasty, after the Xie family of Chen County, the Xie family is also a family of craftsmen, the ancestors of the Xie family, since the Sui Dynasty has been the craftsman of the official family, and in Xie Huan's generation, it is even better than the blue.

"Craftsman Xie Huan greets Your Majesty!" Xie Huan didn't expect Zhao Huan to suddenly come to the craftsman prison, and the whole person was a little confused, you know, in the Song Dynasty, the status of craftsmen was very low.

"Xie Aiqing is flat, I come and take a look!" Zhao Huan said to Xie Huan.

"Just take a look?" Xie Huan was a little confused about Zhao Huan's intentions, and hurriedly said, "Your Majesty, what do you want to see, Weichen will show you the way." ”

So Zhao Huan first went to visit the place of ironmaking, the iron-making technology of the Song Dynasty was actually quite advanced, using the wet method, through continuous knocking, to reduce the impurities in the iron ore, and then cast into the desired shape.

"Xie Huan, have you ever thought that the efficiency of such a smelting technology is really a bit low." Zhao Huan said to Xie Huan.

Xie Huan didn't know why Zhao Huan said this, and explained: "Your Majesty, this wet training technique is already the most advanced smelting technology I know, and the efficiency of our craftsman supervisor is not low, there are more than 1,000 craftsmen in the craftsman supervisor, and now it can make 10,000 arrows a day, even if it is the fire control required by His Majesty, it can also make fifty arrows a day!" ”

Zhao Huan nodded and said, "But have you ever thought that a more advanced smelting technology, for example, we can make molds, and then we can make these things that need to be made into mass production!" ”

Xie Huan heard what Zhao Huan said, and said: "This is impossible, Your Majesty, this piece of iron is so hard, even if there is a mold, it is impossible to put this piece of iron into the mold, this is not water!" ”

Zhao Huan clapped his hands and said: "By the way, it is water, and iron can also be turned into molten iron, as long as iron is turned into molten iron, can't it be mass-produced through molds?" ”

"This is impossible, how can iron be turned into molten iron when it is so hard?" Xie Huan retorted that he was a professional craftsman and had his own pride as a craftsman.

"It's not impossible, it's that the required heat hasn't been reached yet!" Zhao Huan learned in physics in later generations that the melting point of iron is about 1,500 degrees, so he said: "Just like this water, it flows in normal times, but when the weather is cold in winter, it will turn into ice cubes, and the same is true for iron blocks, in order to make it flow molten iron, it needs to reach enough heat!" ”

Xie Huan really hadn't thought about this problem before, but when he heard Zhao Huan say this at this time, he, as a professional, immediately understood that what Zhao Huan said was actually reasonable.

"Your Majesty, this point, the minister has never thought of before!" Xie Huan said to Zhao Huan with some feelings.

"I just provide a direction for you, but how to do it next, you still need to explore, the heat required for iron into molten iron is extremely high, whether you can achieve this heat, you still need to continue to explore, but this direction is definitely right, if you can do it, it is definitely a great innovation like movable type printing!" Zhao Huan said.