Gunpowder already existed in this era, and fireworks and the like were already widely used.

For military use, well...... There are rockets...... You can put a flaming arrow lit on a haystack, tie a big firecracker to the arrow, and shoot it out quickly with a twist, if you shoot it slowly, your ears will buzz.

There is no need to think about muskets and artillery, and the technology of cast iron is not yet mature.

What Guo Zongxun wanted to talk to Liu Ji and Xu Guangqi was about developing explosives.

Because Li Tongjie was also there, Guo Zongxun also drove Wei Zhongxian out, Yue Fei led the troops outside, and the bigwigs summoned by the system were now in the imperial study.

Including Guo Zongxun himself, he sometimes feels funny, and he is also called out.

"I have given you a task to transform the fireworks and firecrackers used for the New Year, and turn them into explosives that can be used in war.

Liu Ji, Xu Guangqi and Song Yingxing were dumbfounded when they heard this, and Lu Siniang and Nalan Yi were even more confused.

"I tell you a ratio, 15 saltpeter, 3 charcoal, 2 sulfur, remember, this ratio is a great military secret, and it must not be leaked."

"Several of you are divided and cooperated, Siniang and Nalan Yi's Wushuangmen are responsible for the preparation of charcoal and sulfur, and saltpeter is in charge of Xu Guangqi and Song Yingxing, these three materials are all scattered and secretly placed, and the place of placement is handed over to Liu Ji and Wei Zhongxian to be responsible, Song Yingxing is responsible for researching the test explosion of iron, fuses and gunpowder that can hold gunpowder, I have even thought of the name, just call it a grenade, I can draw a picture for you first, you can study along this line of thought."

The materials used to prepare gunpowder, saltpeter, sulfur and charcoal, are not secret, but they are also unknown to most people in this era, and the ratio is even more important.

The reason why Guo Zongxun told these people was because these people could be completely trusted, and once the powerful gunpowder was made, Guo Zongxun decided to personally master this special unit that could only use grenades for combat.

"In this matter, those who need money come to me, and I will pay the expenses directly from the internal funds, so there is no need to alarm the household department."

If explosives are developed, the mining speed will be greatly increased, and there are many things that can be started.

Liu Ji and the others glanced at each other, and naturally understood Guo Zongxun's intentions in their hearts, Your Majesty is going to make a big killing weapon on the battlefield.

"The ministers obey."

"I will say one more thing, you must pay attention to safety and confidentiality, if these gunpowders are made, they will be much more powerful than ordinary fireworks, and I don't want to see you have an accident."

"Thank you for your concern, the ministers will definitely act cautiously."

Everyone retreated, and Guo Zongxun called Li Tongjie and Wei Zhongxian in again.

"Now that the armies of both roads have set off, and the dust has settled on the scientific expedition, the next headline hit in Kaifeng City, isn't it time for my grandfather?"

Wei Zhongxian bowed and said:

"Your Majesty, the servants have already been arranged, and before these lifters leave Beijing, the last collective activity is to visit the Wushuangmen Printing House."

"Very good, hurry up and do it, I really want to see my grandfather soon, take my three younger brothers, kowtow to his old man together, and say that my grandchildren are not filial."

Li Tongjie also said next to him:

"Your Majesty's filial piety touches the sky, admirable, now that the autumn is getting cooler, the old fairy Weng is still living in the shack, if this is frozen, it will not be good."

The construction of the Wushuangmen Printing House is in full swing, and the news that the imperial court wants to organize the Jinke Jinshi to visit the printing house has reached here, but how to receive these scholars?

"Lao Chai, you are the only one here who understands the etiquette of the imperial court, and you have to come forward to organize the reception."

Liu Liancheng had a sad face, he wanted to study the things in his mind with all his heart, but why were there always messy things to disturb him.

"The old man doesn't care, you don't know, it's inconvenient for the old man to show up."

Chai Shouli pouted his beard, his heart was actually quite itchy, the old man's eldest grandson was doing a beautiful job, just like his father, very much the old man's demeanor back then.

"Then I'll go to Mr. Hu, although Mr. Hu is from the Northern Han Dynasty, but he is the official of the Northern Han Dynasty."

Liu Liancheng scratched his head and was about to leave, but was stopped by Chai Shouli.

"No, Hu Guirong's bad old man is very bad, you are stupid, Da Zhou is at war with the Northern Han Dynasty, you let Hu Guirong be responsible for receiving the new science and technology jinshi, if he messes you up, you see if Your Majesty can cut off the heads of the two of you."

Chai Shouli didn't expect that he was just a little reserved, Liu Liancheng actually turned around and was about to leave, the anxious in his heart, stupid boy, you ask the old man again, and the old man agreed.

"What then, alas...... Then I can only catch the ducks on the shelves by myself, and if I can't do it well, let Your Majesty cut off my head, Lao Chai, don't worry, I, Liu Liancheng, will definitely not drag you down. ”

Chai Shouli really wants to give this idiot two big ear shavers, where is your energy to study your bullshit, is it so difficult for you to ask the old man again?

"Alas...... Who let the old man and me be chivalrous, forget it, the old man will help you, your head is not good, the bullshit thing you studied recently, if it is used in the Great Zhou army, then my Great Zhou army can dominate the world......"

"Oh, thank you Lao Chai, I know that Lao Chai is the most righteous, I will arrange for Sister-in-law Li to open a small stove for you in the evening, cook a bowl of egg soup for you alone, and add two eggs to you."

"Even if you come to something, the egg soup for Da Chun and Xi'er will also cost two eggs per person......

Under the leadership of Wei Zhongxian, more than 200 new science and technology scholars came to the printing house, and Liu Bowen, Song Yingxing and Li Shaoyou, who were also in the ranks.

"The little old man has seen his father-in-law and all the nobles."

Chai Shouli was in charge of the reception, and Wei Zhongxian naturally pretended not to know him.

"Uncle Lao, let's give a good introduction to the Wushuangmen Printing House for the upstarts of our current department, Your Majesty attaches great importance to this place."

Chai Shouli led a group of jinshi to the door of the workshop where the printing was being made.

"Ladies and gentlemen, my Wushuangmen Printing House is the Imperial Printing House of the Great Zhou Dynasty of His Majesty the Emperor's Imperial Pen, here, there will be a large number of books allowed to be printed by the imperial court, don't underestimate the printing workshop you see, just such a workshop, the printing efficiency is dozens of times higher than the previous one."

All the Jinshi opened their mouths and questioned:

"Aren't they all printed with ink, where else can they go?"

Chai Shouli pulled Liu Liancheng who was following him.

"Little Lao'er would like to introduce to you, this is Liu Liancheng, the chief designer of our Wushuangmen, who invented movable type printing......"

Liu Liancheng immediately interrupted Chai Shouli to speak.

"Ladies and gentlemen, I don't have such a big ability, the real invention of movable type printing is our old Mr. Chai, he got inspiration from the engraving of seals, the previous engraving and stereotype changed to a single font engraving, and then these words are arranged and combined, so as to save the time of engraving, and the font of a single engraving can also be reused......"

Just when Liu Liancheng introduced Chai Shouli, someone in a group of new science and technology scholars suddenly shouted in surprise:

"This is not Luoyang's Chai A...... What's that, isn't this Luoyang's Chai Sikong? ”