Xia Hongsheng didn't know Li Shimin's considerations, and he was still living a leisurely teaching life in his academy. Pen, fun, pavilion www. biquge。 infoIn addition to teaching, it is also about making fireworks.

It's like drawing a stick figure, and the fireworks should be designed to be understandable and not too complicated to do. So stick figures became the best reference.

The light bead is made by mixing gunpowder and a substance that produces a flame reaction, and is a key part of fireworks. The gunpowder below sends the orb of light into the air, igniting the orb. The light beads burn, producing a flame reaction that emits different colors of light. And after a clever arrangement, the order of burning is determined. In this way, what shape the light beads are arranged into, what shape will bloom in mid-air. As a result, when the fireworks are detonated, they can bloom in a bright and colorful pattern in the dark sky.

In fact, Xia Hongsheng has been trying for more than a month. The things that Zhang Laodao made that contain metal ions and can trigger flame reactions have also been used in several batches.

None of them succeeded.

The main thing is that there are always mistakes in arranging the position of the light beads and arranging the order of combustion.

Either it is scattered, or the burning order is out of order, and the pattern cannot be formed.

However, just the splashing out of the night sky in various colors was enough to make the students of Jingyang Academy excited and curious.

But in Xia Hongsheng's view, there is no pattern, after all, it is not beautiful enough.

After months of hard work, the colors of the fireworks have increased to four. As long as you can solve the problem of the pattern, you will almost be able to get it.

However, at night, the academy kept banging, which also made the people of Jingyang quite afraid.

I also reported it to the prefectural order.

When it came to Xia Hongsheng's academy, the county commander had to go and see it himself, but Xia Hongsheng told him that this was a kind of secret thing in the army entrusted by the military machinery workshop to the academy, and its usefulness was also confidential, so he couldn't tell him. Let Zhang County Order tell the people that they don't have to pay attention to it. Zhang Xianling also believed it, and went back to tell the people of Jingyang that it was the academy doing things there, almost like a burst rod, not some kind of demons and ghosts in the mountains, and it would not harm the people, so don't worry about it.

Actually, it's a pretty dangerous thing to do, because to make fireworks is to deal with gunpowder. During this period, it also needs to be exposed to the sun many times, and the dried black powder is also dangerous. Rolling light beads, breading gunpowder on the outside of light beads, and arranging light beads were all done by Xia Hongsheng himself.

In fact, Xia Hongsheng can use an excuse to hand over this matter to the Military Aircraft Workshop to study, and there are more people there. However, because of his intentions, Xia Hongsheng still hopes that he can succeed in the trial and then hand it over to them.

After liftoff, the combustion occurs almost simultaneously, and the order of the combustion depends on the speed of the combustion. What Xia Hongsheng has to do now is to control the amount of gunpowder to achieve the purpose of controlling the speed of combustion, so that the light beads will burn in a certain order and direction after liftoff, forming a pattern. Of course, the kind of fireworks that burst out in all directions and burst out like a chrysanthemum are no problem now.

However, today is destined to be unable to study Xia Hongsheng properly.

Because the guards of the academy came to report that the guards of the palace were coming.

Xia Hongsheng sighed, put down the tools in his hand, and sighed how good it would be if there was a car now, while leaving the academy and reluctantly boarding the carriage.

A car traveling at 40 kilometers per hour and a horse-drawn carriage traveling at 40 kilometers per hour are completely different from heaven and hell. Even if the wheels are already soft wheels made of wear-resistant cow tendons in a bundle, even if a spring is added between the wheel and the upper plate as a shock absorber, even if the road surface is a flat cement road - it is slow and bumpy.

After an hour of sitting on an acupuncture chair, Xia Hongsheng's buttocks were numb, and he finally arrived in Chang'an.

As soon as he arrived in Chang'an, he immediately entered the palace to meet him.

Li Shimin was reading a book in the study. Seeing that Xia Hongsheng had entered, he put down the book, leaned on the backrest, and said to Xia Hongsheng: "I heard Qingque say that you have been crackling all day and night in Jingyang recently, what are you tinkering with?" ”

Cut, when I made a hot air balloon in the academy, I didn't ask it explicitly, why do I ask now? Or because of the gunpowder!

Xia Hongsheng said in his heart.

However, Xia Hongsheng had an excuse for this, so he said: "Back to Your Majesty, Weichen is making something that can be used both for military and civilian purposes. ”

"Oh? What is it? Li Shimin asked curiously.

"It's a bit similar to a cannon battle, but it's more complicated. Using gunpowder, cannons that emit light of different colors were sent into the air, so that messages could be received even from a distance. Xia Hongsheng said to Li Shimin.

"Be specific." Li Shimin straightened his back, supported his chin with both hands, and said.

"Yes." Xia Hongsheng explained: "The thing that Weichen makes is called fireworks. It is a very complicated artillery battle. When lit, it can explode into the sky, emitting different colors of light depending on what is placed inside. For example, green, red, yellow, and so on. From the civil point of view, it can be watched, just like the goddess scattering flowers, the light and rain are colorful, very beautiful and good-looking. And the military can be used as a signal. Let's say two teams are far apart, but they have to act at the same time. It is definitely not possible for the herald to run, it is too late. The sound of the trumpet could not be heard, because of the distance. At this time, you can use this thing, ignite, and explode in the air. For example, green represents action, red is cancellation, and yellow is retreat. Or if a spy informs the army lurking outside that it is time to attack the city, he fires a green one, or if he can't attack, he sends out a red one. In short, in this way, even if they are far away, they can transmit signals to each other. Wechen calls it a flare! ”

"I see!" Li Shimin nodded: "Xia Qing always has the Tang Dynasty in mind and the court in his heart, okay!" ”

"I don't know why Your Majesty summoned Weichen today?" Xia Hongsheng asked, "It's not just because of this, right?" ”

Li Shimin nodded and said, "I have thought about your idea of going to Quanzhou, and I can give you a holy decree to allow you to act cheaply in Quanzhou, and make the officials of Quanzhou cooperate with you." However, I have a few requirements that you must fulfill. ”

Xia Hongsheng perked up, and immediately bowed and asked, "What does Your Majesty want, but please command!" ”

Li Shimin smiled and said, "First, you must contact the King of Hejian County and train an amphibious force for him as you mentioned before. Second, you must take advantage of the convenience of maritime business, even if you go to Linyi in person, you must also open a grain route for me to provide a steady stream of food for the Tang Dynasty. Can you do it? ”

Xia Hongsheng laughed: "Weichen takes the order!" ”

"Good!" Li Shimin said: "In this case, I allow you to act cheaply according to the specific situation!" (To be continued.) )