The embarrassed three returned to the barracks, but Yang Qing didn't dare to disturb Guo Xi again, and secretly dragged the merchant Zhang Nan back to his sleeping tent directly. Now he has no sleep, and he wants to do a chemical experiment!

The standard ratio of military gunpowder is 75:10:15 for saltpeter, sulfur, and charcoal, which is easy and has been taught in junior high school chemistry classes. The key is how to apply the black powder after it comes out, and this Yang Qing hasn't thought about it at all. But if anyone asks Yang Qing about this question, Jian Yu Wei Zuolang will disdainfully tell the person who is looking for ballast - the Tang government has a Ministry of Industry, and even more so a military superintendent! No matter how much, get the black powder out first!

Carefully spread the looted saltpeter and sulfur on the desk, Yang Qing closed his eyes and pondered for a moment. then instructed Zhang Nan to go to Langzhong in the army to borrow a scale, and by the way to see if there was any bamboo nearby, and also cut a branch back; Tell Shang Han to prepare tools that can be crushed, and bring some charcoal back by the way.

It didn't take long for both of them to come back, and the things that Yang Qing wanted were all purchased. Except for the fact that Shang Han really couldn't think of any good crushing tools for a while, and was almost found when he went to steal the man's rolling pin, everything went smoothly.

Yang Qing shook the heavy rolling pin, it's okay. "Do it! I've divided the cases and crushed them all! After grinding, wrap it in paper. ”

By the time the three of them were sweating profusely and grinding all three ingredients, it was almost dawn. Yang Qing looked at the pile of white, yellow, and black powder with satisfaction, and felt a sense of accomplishment. The previous visual inspection was quite reliable, and in terms of volume, it basically met the requirements of the black powder ratio, of course, it still had to be weighed down.

In order to commemorate today's great day, in order to show his affectionate remembrance of bidding farewell to the era of cold weapons and his enthusiasm for the arrival of the era of hot weapons, as the first person to personally cut the fetters that bound the military progress of the Tang Empire, Yang Qing decided to ......

Weigh it yourself.

……

"Shang Han! Here you go! Yang Qing depressedly put down the scale in his hand, this scale is too small! My hands are shaking a little too exaggerated!

Shang Han couldn't help but laugh and picked up the scale: "Yes." Uncle, how do you scale? ”

"I said you scales." Yang Qing took a long breath.

Because the saltpeter didn't take much, Yang Qing got about two catties of black powder, and the three of them looked at the pile of results in front of them that they had worked hard all night, and they didn't dare to come out. The eyes of Shang and Zhang were confused and curious, and Yang Qing's eyes were excited and excited.

"Ganting, is this the same gunpowder you've seen on weekdays?" Yang Qing is most concerned about this.

"Like...... It's not quite the same. Shang Han shook his head. I can't say it......"

The three of them glanced at each other and said in unison: "Try? ”

Instructed Zhang Nan to see a bamboo tube with a bottom to come over, and Yang Qing was ready to fill it.

"Are you crazy?! Small! The smallest section! When Yang Qing saw Zhang Nanxing rushing over with a bamboo tube the size of the mouth of a rice bowl, he almost sat directly on the ground. What does Zhang Nan want to do? Killing the Lord or Killing the King?!

Zhang Nan's desire to watch the New Year's Super Cannon Bamboo in advance was ruthlessly stifled, and he reluctantly attacked the end of the bamboo. Yang Qing licked his dry lips, there was a smell of sulfur, I don't know if it was just got it or it floated up from the hot spring pool under the mountain. Although he had never seen the explosive power of military black powder with his own eyes, the bamboo tube that Zhang Nan threw at his feet was too terrifying, it was simply a bomb with a diameter of fifteen centimeters! My journey has just begun, and I don't want to die so early, not to mention that I still have three delicate wives at home......

Zhang Nan was quick with his hands and feet, and quickly sawed the bamboo joints, interrupting Yang Qing's nonsense in time.

Filling, plugging, pressing. That's it!

Walking out of the tent, Yang Qing's eyes wandered around, looking for a suitable blasting site. Zhang Nan looked at the "little firecracker" in Yang Qing's hand with some contempt, quite contemptuous.

"That's it!" Yang Qing found a large open space. This place is good, empty enough, there are no trees around, not afraid of causing wildfires, and there are a few big rocks on the side to hide from, good!

Looking at the "firecracker" in his hand, Yang Qing was a little dumbfounded and forgot to make a lead!

The three of them had no choice but to find a large pile of dead branches, carry them to the center of the clearing, pile them up, and then light the fire.

"Now I'm going to ask you two a very serious question, and you must not conceal false reports!" Yang Qing's face was serious, and his expression was extremely serious.

"Yes!" Shang Han and Zhang Nan didn't know what made Yang Qing so serious, and at the same time replied with righteous words.

"You two...... Who's better at light work? ”

"Light work?" Shang and Zhang looked at each other.

"Yes, light work. Answer me honestly. Yang Qing nodded solemnly.

"That...... May I ask my uncle, what is light work? Zhang Nan scratched his head, and asked doubts without fear of death. Shang Han was also puzzled and curious.

Yang Qing's shoulders collapsed, suppressed his urge to cry and laugh at the same time, and took a deep breath: "Light martial arts are the art of light body improvement for those who practice martial arts!" ”

Zhang Nan shook his head pitifully, and then turned his head to look at Shang Han, who shook his head inferiorly.

"Just ask, which of you usually runs faster!" Yang Qing surrendered.

"Him!" "Me!"

"Oh, that's good. This glorious and difficult task is handed over to you! Yang Qing shoved the firecracker into Zhang Nan's hand, "Throw this into the fire, and then go back to the stone immediately!" I'm not kidding you! Remember? ”

"Remembered. But my uncle ......"

Zhang Nan was anxious to say something, but Yang Qing glared: "There is nothing!" Do what I say! In a softer tone, "Yanxi, you and Gan Ting are my right-hand men, I don't want you two to have anything wrong with me, and I will rely on you a lot in the future." This firecracker is very powerful, and it's better to be careful in everything, understand? ”

"Uncle...... I...... Thank you! I mean, I don't have to go over and throw it, I can throw it in the fire behind this rock! Big brother can too, it's not a difficult thing! ”

"Huh? So accurate? Yang Qing was taken aback, and then thinking about the behavior of these two brothers, he would definitely not say anything he was not sure of, and said stupidly, "Don't say it earlier!" Then you throw it. "Although the conditions are limited, I can only find such a vacant land at the moment, how can there be a distance of twenty meters from this stone to the fire, could it be that Ray Gemil has crossed into my Datang?

Zhang Nan glanced at the distance, and then raised his hand with great confidence, "Whoosh!" "The firecracker made a beautiful arc and smashed straight into the fire.

Yang Qing lowered his head violently, and at the same time pressed the heads of Shang and Zhang down.

……

"Huh? Why is there no movement? Zhang Nan waited for a while, but there was no sound, and he wanted to look up and see.

"Be honest!" Yang Qingmeng exerted his strength and pressed him down again, "It snowed heavily at night, and the bamboo was damp, and it might have to burn ......."

"Bang !!" A bang!