After listening to Zhang He's narration, Yang Wei felt that his fellow villager was also a rare talent, and it was absolutely rare to find someone who could be so righteous, and he must be recruited to his command. So he asked Zhang Hedao: "Can you still contact this fellow villager?" Where is it now?" Yang Wei secretly thought, probably his fellow villager has already returned to his hometown, even if he returns to his hometown, he will also send someone to find him back.

Zhang He said: "He is now in my thousand-person team, I asked Commander Xiong to summon him into the Yang family's army, and Commander Xiong agreed." But he told me that the army is a place that pays attention to strength, and my fellow countryman has not practiced qi at all, so he can only be classified into my thousand-man team, let him follow me, and I will take care of him. ”

Yang Dawei is happy, this is a trouble-free experience. Zhang Hedao asked: "What is the name of this person? Since he can read and hyphenate characters, has he ever had a meritorious reputation?"

Yang Wei's question was a bit redundant, if he had fame, he would never come to be a soldier. Sure enough, Zhang He replied: "My fellow countryman's surname is Zhan, although he is familiar with the scriptures and history, but he has not been able to pass any fame in the examination, and he has not even been able to pass the examination. ”

Yang Wei was surprised: "Why is this?"

Zhang He said with some hesitation: "He is a left-hander, so he is used to writing with his left hand, and because his family is poor, he has not gone to private school, and there is no gentleman to put his bad problems over, and he does not dare to write with his left hand when he takes the test Xiucai, and he can't even recognize himself when he writes with his right hand. He also practiced writing with his right hand, but he always couldn't write well, and this time he never wanted to take the test for Xiucai, so he came to be a soldier. ”

Yang Wei was dumbfounded, and he really didn't care much about this matter. Moreover, writing with the left hand can exercise the right brain, which is not a problem at all. So he said: "Let him follow me, and be responsible for sorting out the army's order letters, battle plans, battle maps, and so on." ”

Zhang He was delighted and thanked.

At this time, they had come to a remote courtyard, although the surroundings were very quiet. But the courtyard was not quiet, and there was a sound of "clanging". Yang Wei was surprised, and then relieved, it must be that Ma Jun thought of some idea again, and he was experimenting. When he came to the door, he knocked on the courtyard door, and when the courtyard door opened, he saw Ma Jun sweating profusely, and when he saw Yang Wei, he showed a look of surprise and joy. He snorted and said, "Master is here." Yang Wei nodded at Ma Jun and asked, "What are you doing?" At the mention of this, Ma Jun immediately smiled and replied: "When I went to the workshop that day, I felt that the temperature in the workshop was very high, and suddenly my heart flashed, and I thought of a lantern making method called Pan Cockroach Lantern that I had seen in a book before. This kind of lantern is to use a heat source to make the little person in the lantern move, I now just want to use the heat in the workshop, if it can drive the operation of the whole set of equipment, then it can no longer be limited by the workshop can not be separated from the river. I've made a cocktail lamp. Ma Jun said, stretching out his hand and pointing to a lantern placed aside. Yang Wei looked at it, what kind of cockroach lantern, isn't this just a marquee? To say that Ma Jun's idea is really quite creative, but there are still many difficulties. Ma Jun continued: "I'm now trying to drive the windmill with a heat source. As he spoke, he gestured to the half-finished thing on the table, but he still couldn't tell what it was. Yang Wei frowned and said: "Your idea is good, but there are a few problems to be solved first, one is the problem of fan blades, it is not possible to rely on a heat source to drive wooden fan blades, and the fan blade material must be light and heat-resistant and durable." The second is that this set of equipment requires a lot of power, and it cannot be driven by a single heat source, and the power is not enough. The reason why such a large amount of power is needed is because of the lubrication problem between the components, although animal fat is now used instead, but the cost is too high, the replacement is too frequent, and the lubrication effect is not very good. If the lubrication problem had been solved, the power needed would not be as great as it is now. If these two problems are solved, you can realize this idea. In fact, these two problems are solved, you can try to use your Fengshen, it's too awkward, I'll call it a blower, use the blower to blow the big fan blades, and then use the big fan blades to drive the blower. It can be artificially given an initial power and then let it achieve perpetual motion. Ma Jun was very depressed when he heard the first half, but his eyes lit up when he heard the second half. Yang Wei saw him like this, and Suo gave him a lesson, "Power comes from energy, for example, water flowing from a high place to a low place will produce energy. Both hot air rising and cold air falling produce energy. The flow of air from a place of high pressure to a place of low pressure produces wind, which is also a type of energy. Ma Jun was confused. He opened his mouth and asked, "Master, what is air, what is air pressure?" Yang Wei had a black line on his face. He forgot that no one really knew what air and pressure were in this day and age. So he explained: "Air is a formless and colorless thing, we breathe air all the time, we inhale it, we absorb part of it by the body, and we expel another part of the air that is useless to us." As for the air pressure, we sometimes feel stuffy, which is due to the low air pressure. Sometimes I feel that the autumn is high and cool, which is a sign of high air pressure. Okay, let's move on to the issue of energy, when something changes from one state to another, the volume increases rapidly, which produces energy. Yang Wei opened his mouth to ask when he saw Ma Jun again, but he didn't wait for him to ask, and continued to explain: "For example, water is liquid, and when the weather is cold, it will condense into ice, and ice is the solid state of water, and when water is heated, water vapor will come out, and these water vapor is the gaseous state of water." When water becomes gaseous, it increases in volume dramatically, and energy is also generated. If you have time, you can study the energy that is formed by the liquid-gaseous conversion of water. Yang Wei instilled the principle of energy and steam engine into Ma Jun, and he wanted to see if Ma Jun could develop a steam engine. At that time, if there were trains, the area that could be controlled by the Viet Nak Dynasty would increase dramatically, and it would be possible to unify the Eurasian continent and effectively control it. Ma Jun had fallen into a stupor, and Yang Wei was talking about something he had never thought of. Even if I thought of it, I didn't systematically organize it. Moreover, Yang Wei also introduced some new concepts, which made his concept change dramatically. At this moment, he admired Yang Wei even more. Yang Wei continued: "Okay, these are your next research directions. Now do some simple things, and design a plan to make the equipment work with human or animal power as soon as possible, so that the blacksmiths can build the parts they need. Then dismantle all the equipment in the workshop and transport it to the city, and you can discuss with the housekeeper the manpower and carriages and horses you need. Transported to the city to assemble it and continue to work. This task is not very difficult, but there must be no mistakes, otherwise, the workshop will be shut down for a while, and our horse armor is not yet fully equipped, and time cannot be wasted. Ma Jun respectfully responded, Yang Wei said: "Okay, you are busy, I'll go back." Turning around and walking outside the hospital, Ma Jun respectfully sent Yang Wei out of the hospital, and Yang Wei and Zhang He went back to Yang's mansion.