This kind of work as a craftsman itself is a work that relies on understanding, and the so-called master leads the door, and the cultivation is in the individual. In Li Yuan's newly built school, the craftsmen who were teachers did not have much education. Many people don't know a basket of words, and they don't know a person who is one. They also learned the craft from their own teacher, and they went to help their teacher's home, and when they were not learning the trade, they ate and lived in the teacher's home. All kinds of chores to catch up with the teacher's home have also fallen into their hands, but when the teacher who catches up with his own has received any work, he has to help his teacher go to the construction site with various tools, and is responsible for handing his teacher some tools to use, and at the same time, he also plays some hands on the side to see how his teacher does the work with his eyes. It is this form of passing on the bands that has passed on the craftsmanship left by Lu Banye to this day, so since this kind of hand-to-hand bands have been carried out for hundreds of years. Then it shows that this teaching method is indeed effective, but in order to learn more deeply from Li Wenyuan, Li Yuan also specially equipped each craftsman in this school with a literate scholar, when there is no teaching task on weekdays, these craftsmen will tell the scholar all the skills they know in the form of oral description, and then the scholar converts it into words and records it on paper and compiles it into a book for preservation. But the cat teaches the tiger and still has the ability to climb the tree without teaching, not to mention that these craftsmen still rely on this craft to eat, how can they tell all their skills to the scholars? After all, it is not used on Li Yuan's side, unlike Li Wenyuan's side, where you can receive a pension after you get old, even if you have no work to do, you can ensure that you have no worries about food and clothing. Therefore, although these craftsmen can do some simple instrument making, once it comes to some precision structural processing, these old craftsmen still need to come out in person.

It didn't take long for the memories of these craftsmen to be faithfully recorded by these scholars. It was then compiled into a volume ready to be printed in batches. And because all the engraving masters were taken away by Li Wenyuan, Li Yuan was printing these books that recorded the various skills and techniques of craftsmen, and the engraving plates used still needed to be customized from Li Wenyuan. Since these books were handed over to Li Wenyuan, even the copies inevitably leaked the approximate level of craftsmanship mastered by the current craftsmen under Li Yuan's rule, and after Li Wenyuan learned about these, he saw that the above records were some common and commonly used primary skills, so he did not take this matter to heart, but handed it over to the gold shopkeeper to arrange for the engraver to convert the words recorded on these books into engravings, and then slaughtered Li Yuan fiercely, and then handed over the engraving to Li Yuan.

Li Yuan scolded Li Wenyuan's black heart, and at the same time had to pinch his nose to accept Li Wenyuan's cruelty, and then after printing thousands of copies of these books, they were distributed to the craftsmen and apprentices who came to enter the school to study, only to find that there were no people among those apprentices who could read the words recorded in these books. This inevitably had to teach these craftsmen to read, which made Li Yuan have to take out some benefits in exchange, promising that the literate craftsmen of the Guanlong nobles would never enter the official career, and only then did the children of the Guanlong nobles arrange for them to enter the school and set up a course to teach these apprentices to read and write. This is another unexpected expense for Li Yuan. But forced by the situation, Li Yuan had to pinch his nose and swallow the bitter water of this large amount of additional expenditure into his stomach with his teeth. Fortunately, Li Yuan has accumulated a lot of wealth in his territory in recent years, so although these expenses are enough to make Li Yuan feel pain, they are not unacceptable.

After several twists and turns, Li Yuan finally opened this school for training craftsmen and apprentices, and more than 2,000 seeds have been sown into the soil, just waiting for the day when the soil will sprout and bear fruit.

On this day, Li Yuan sat in his mansion and looked at the package of gray powder that Li Jiancheng brought to him in front of him, frowned and asked Li Jiancheng: "You said that there is something important for your father to come and see, is this this bag of gray powder you are talking about?" ”

Li Jiancheng nodded and said to Li Yuan, "Yes, father." This is something called gunpowder that the child spent a lot of money to entrust people to get from the hands of Li Wenyuan in the Western Regions with some shady means. It is said that Li Wenyuan's team capable of spraying flames used this powder. This kind of powder can burn when it encounters Mars, and the burning trend is very fast, you don't look at such a large pack, but if it really touches Mars, it will burn out in an instant. The child heard that Li Wenyuan's team relied on the energy produced by the burning of this gunpowder to push the stone projectile forward to achieve the killing of the enemy, and the power was very fast, even the well-made Mingguang heavy armor could not resist a single bit. If we can make this kind of weapon, then we will be able to fight against any force other than Li Wenyuan in the future. ”

After listening to this, Li Yuan didn't believe Li Jiancheng's words, so he used a bamboo pick to push it out of the packaged powder, and said to Li Jiancheng: "You use this small half to show your father according to the method you said, can these medicinal powders really push the stone projectile forward?" Don't listen to the words of the profit-earning merchants, who are not very trustworthy. ”

Li Jiancheng saw that his father didn't believe it, so as his father said, he carefully scraped the small half of the medicinal powder that Li Yuan pushed out onto a piece of paper with a bamboo piece, and then put it in the brazier in the house that had not yet been put away. He took a piece of wood incense from the side, lit the wood incense with the help of the fire candle next to him, and then carefully handed it to the next person, and motioned to the person to light the wood incense on the powder. As soon as the subordinate touched the incense head on the piece of medicinal powder according to Li Jiancheng's instructions, he suddenly sneered a few times, and then a bright and dazzling light bloomed in the brazier, and at the same time, with a puff of black smoke rising, the previous silver powder turned all black. The face of the man who couldn't dodge was smoked like coal by this black smoke, and at the same time, his eyes were choked by this black smoke, and suddenly two lines of tears flowed, and he couldn't stop it no matter what.

Li Jiancheng comforted the subordinates who were a little frightened because of this incident, and told him to just go down and clean his face with water, and after washing his face, the tears would naturally stop after half an hour, and it would not be in the way. Then he turned to Li Yuan and said, "Father, this is the power of gunpowder that the child told you. ”