Liu He brought the math master Xu Yue with him this time has a deep meaning, a small abacus is just to let Xu Yue see his attitude and determination to support arithmetic, and it will really make Xu Yue feel that the subversive concept and ideas are still to come, Liu He is ready to take it out little by little, lest this master become a madman or a fool because he suddenly can't accept too many unbelievable views.

For example, Liu Heruo told astronomer Xu Yue that the earth is round, the moon orbits the earth, the earth orbits the sun, and the sun is a large fireball many times larger than the earth......

For another example, if Liu He writes a string of calculus calculation formulas, it is estimated that Xu Yue will not be able to drill in it for the rest of his life......

Liu He took Xu Yue to help him develop a good habit of applying what he had learned, and turn the wisdom in his mind into various inventions and creations that really benefit the country and the people!

That morning, Xu Yue, who was so excited that he hadn't slept well all night, came to Liu He's residence early in the morning with red eyes, waiting for Liu He to assign him a task.

Liu He, who had just finished washing, looked at Xu Yue, who was holding charcoal and cardboard and his eyes were as red as rabbits, and quipped: "Is it time for Mr. Gonghe to start a family in Youzhou?" ”

"Starting a family? This is not in a hurry, not in a hurry! Last night, Childe said that today he asked me to help make a few sketches, and now you will say your requirements, and I will draw them on the spot. ”

The great mathematician apparently didn't understand that some lewd man was laughing at him for his red eyes because he couldn't sleep at night because he wanted a woman. No way, people with high IQs tend to be unresponsive in some ways.

Liu He didn't make a joke about Xu Yue, nor did he feel bored, and said, "Mr. Gonghe, I have had breakfast with me, and we still need to wait for a few people to come over before we can officially start." ”

Xu Yue was not polite to Liu He, so he sat down and drank a bowl of millet porridge with Liu He, and ate a plate of sauced beef, a plate of bracken, and two eggs. calmly enjoyed the noble treatment that countless people dreamed of eating at the same table with the eldest prince of Youzhou.

Millet porridge nourishes the stomach, sauced beef grows strength, bracken supplements vitamins, eggs replenishes the brain, although Liu He's breakfast is simple, unlike other princes and grandsons, each meal is seven dishes and eight bowls so luxurious, but the nutrition is sufficient, but it also nourishes people.

When the two of them finished breakfast in the courtyard, Xu Huang came in and reported: "Son, the masters of the farm tool workshop came to visit and said that they had been invited by you. ”

Liu He nodded. Took Xu Yue to the front hall.

Came to visit Liu He is a few old acquaintances, these craftsmen under the guidance of Liu He made three different specifications of the Quyuan plow, since then out of control, not only in Macheng has a considerable status, but also become the master of the Macheng farm tool workshop, concentrate on teaching apprentices, supervise the manufacture of various farm tools.

Seeing Liu He enter the door, Niu Blacksmith, Ma Carpenter, Zheng Coppersmith and others hurriedly bowed down and saluted Liu He together: "The villain Niu Tie (Ma De, Zheng Erquan) greets Gongzi!" ”

Liu He smiled and stretched out his hand to help several people up. He said kindly: "Master Niu, Master Ma, Master Zheng, I haven't seen you for a few years, your body is still so strong and tough, it seems that life is good!" ”

"The little ones can have a good day today. It's all given by Childe! The blacksmith said in a loud voice.

"A few of us old guys have been looking forward to the day when we can be summoned again by Gongzi, but we didn't expect to be waited for!" Carpenter Ma also chimed in.

"Childe called us, do you have a new idea?" Coppersmith Zheng looked at Liu He expectantly.

"Hehe, don't worry, everyone. Come, come, sit down, and listen to me tell you slowly. Liu He beckoned everyone to sit down around the long table. At first, a few people refused to sit down, but they couldn't withstand Liu He's persuasion, and finally sat down with half their buttocks.

Everyone sat down, all of them involuntarily held their breath, opened their eyes wide, and pricked up their ears, for fear of missing any of Liu He's gestures and words.

"This gentleman next to me is our famous arithmetic master Xu Gonghe, today he will help you draw and calculate, you just need to follow my train of thought down, when you find something wrong, speak out in time to remind. Today I invited a few masters to make two tools related to farming, one of which is called a wheel water wheel and the other is called a chicken car, and my specific idea is like this......"

Liu He relied on the memory of his previous life to carefully explain the shape and working principle of the wheel waterwheel to everyone, and he said while drawing some outlines on the paper crookedly, and then the rest of the craftsmen supplemented it, while Xu Yue used charcoal to draw a three-dimensional waterwheel structure diagram.

With the assistance of these experienced masters and a geometry master, even without a top inventor like Ma Jun in Youzhou, Liu He quickly completed the design of a giant wheel waterwheel with a diameter of more than three zhang.

Ma Jun was an official in the Zhongping period, and once made a small overturned car that was light and durable, that is, a keel waterwheel, which has now spread all over the Han Dynasty and has really benefited the people a lot. Nowadays, the giant runner waterwheel that Liu He has made up is suitable for placing on both sides of a slightly larger river to irrigate a village, which is more powerful than the keel waterwheel.

Looking at the lifelike waterwheel on the drawing, Liu He was in awe of Xu Yue's geometric composition skills, and Xu Yue was deeply attracted by the idea of using the wheel axle principle to automatically draw water with the help of water flow.

After getting the wheelwheel, Liu He told everyone about the shape and operation principle of the chicken cart, this time it was easier, and soon a hand-pushed wheelbarrow pattern jumped on the paper.

The chicken cart gets its name because it is shaped a bit like a rooster: a huge wheel rises high, like a high-spirited cockscomb; The two wings are sturdy wooden frames for stacking goods; The two wooden handles at the back are lifted by the cart man and placed next to the crotch, like flamboyant chicken tails.

The best route for the chicken cart is the ridge road, which is no more than two feet wide, on which the ox carts and horse-drawn carts are intimidated, and only the one-wheeled chicken cart can easily maneuver. This car can carry two or three hundred pounds of goods on a rugged road, and those who are good at driving can even carry seven or eight hundred pounds.

Seeing that he was done, Liu He got up and said to several craftsmen: "You have a division of work, most of the craftsmen are responsible for making and experimenting with the giant waterwheel on the shore of the river, and the other group of craftsmen are rushing to make this kind of chicken cart. It's still the old rule, the sooner you finish, the richer the rewards. All kinds of materials required during the development period are provided by the official treasury of the school governor's office, and it is important to make the key parts such as bearing brackets strong and durable! ”

Several craftsmen accepted Liu He's task, and with unconcealed excitement on their faces, they hurriedly left the house.

Liu He sent a few craftsmen away, and turned around to see Xu Yue staring at the drawings with a frown, so he asked with some curiosity, "Mr. Gonghe found something wrong?" ”

Xu Yue shook his head and replied: "I didn't find anything wrong, I was attracted by the design of the wheel axle, which can change the direction and size of the force, and I felt that it seemed that some doorways could be figured out from this." ”

Liu He was reminded by Xu Yue's words, and suddenly remembered the pulley set commonly used in later generations, so he hurriedly lay on the long case to draw the fixed pulley, movable pulley and pulley group, and then took out his remaining mechanical knowledge and threw it to Xu Yue.

Liu He's words were very messy and not systematic at all, but Xu Yue's mind was different from ordinary people, he looked at the pulley group graphics drawn by Liu He, and then linked them with the knowledge fragments mentioned by Liu He, and quickly figured out a clue.

Xu Yue said with emotion: "Childe, the design of this pulley set is really not simple!" If we can make pulley components from a strong and wear-resistant material, steel, we will be able to use them in a large number of construction industries and factories in the future. The so-called four or two thousand pounds is exactly what it means! ”

"That's true, as long as you make reasonable use of the lever principle and the pulley block, and give you a support point, theoretically speaking, you can lift a mountain!" Liu He joked with Xu Yue.

Xu Yue didn't smile, and asked eagerly, "Do you want to send someone to call back the few craftsmen who left just now?" ”

"What are you doing when you call it back?"

"Let them develop a pulley!"

"Don't use it for the time being, this thing is too powerful, it's easy to be learned, and then we can build giant buildings on a large scale in the future, such as building bridges across rivers and high-rise buildings with more than nine floors!"

Liu He made up the simple pencil, the bead abacus, the wheeled waterwheel and the wheelbarrow in one go, although he was still a little unsatisfied, he still decided to stop for the time being, and did not dare to get some more important core things out in advance. For example, pulleys, cement, gunpowder, such as Baotou steel, such as ......

Some things can only appear at the critical moment of decisive battle, and if they are released early, they will cause the enemy to imitate them vigilantly, and the result is a small sweetness or two and then face big trouble.

For example, the high bridge saddle and two-foot stirrup used by the Youzhou cavalry are no longer a secret, if it weren't for the horseshoes that are not very eye-catching, they may have been learned by those who have a heart. However, with the living environment faced by Liu He at that time, if the troops were not equipped with a large number of high-scale saddles and stirrups, it would not be possible to greatly improve the overall combat strength of the Youzhou cavalry in a short period of time, and it would be impossible to achieve a series of small victories.

If you pay, you will be rewarded. If you have gained, you have to pay. Although many powerful forces have now discovered the secret of the Youzhou cavalry, they are still several years behind Liu He in terms of skills and tactics, not to mention that Liu He now monopolizes more than half of the war horse trade in the north, even if Yuan Shao, Cao Cao and Yuan Shu want to develop cavalry, they must first get a large number of war horses!

After Liu He got the abacus out this time, it will not be popularized on a large scale, but will only be used in the government offices and the army at a considerable level in Youzhou, as for the giant wheeled waterwheel and chicken cart, which are good things that are conducive to farming, Liu He will completely let go of the technique and let them benefit the entire Han people.

In Liu He's mind, there is no distinction between north and south, and there is no distinction between states and counties, their lives are already very difficult, but they are still struggling in dire straits, if they can't try their best to pull them out, then all their efforts and efforts will be meaningless. (To be continued......)