Chapter 53: 3 views with ball bearings

　　 Li Mansion, West Yard.
　　 Li Zexuan rolled up the drawing, handed it to Yan Shaoning, and said, "Brother Shaoning, I understand your drawing method, but I still think my method is more concise and clear."
　　 "Oh? Then, Xiaoxuan, tell my brother, what's the method of your drawing."
　　 Yan Shaoning saw that Li Zexuan was very confident in his drawing method, and couldn't help but want to understand the magic of this method.
"Little brother, this picture is a three-view and isometric side view of a component. The so-called three-view is to draw the outline of the object from the front, side and top of the object. For example, this stone, brother Shaoning, From the front..."
　　 Li Zexuan picked up a stone as a reference and explained the three-view drawing method to Yan Shaoning. After a while, he packaged the part that the professional teacher told him and gave it to Yan Shaoning.
　　 "...Look, Shaoning brother, with these three views, the craftsman can form a model of the part to be made in his mind at a glance, and it will be easier to mark dimensions on the three views."
After listening to Li Zexuan’s explanation, Yan Shaoning stood up, paced, contemplated for a moment, and suddenly shouted: "Wonderful, wonderful, this drawing method is really wonderful, Xiaoxuan, you are a genius, you draw like this It really looks clearer, with a lot of unnecessary annotations missing."
Yan Shaoning sat down again, rubbed his hands, and stared at Li Zexuan excitedly: "I must tell my father this drawing method and let him promote this method, Xiaoxuan, are you willing to go to jail? If Dad knows your talents, he would definitely be willing to ask you for an official position before your majesty."
　　 Li Zexuan shook his head and said, "Thank you, Brother Shaoning, for your kindness. The younger brother had been away from home for many years, and he just came back a few days ago. Now he doesn't want to be an official.
　　 will be a prisoner almost equivalent to the Chinese Academy of Sciences in the previous life, let Li Zexuan do research there every day, he is not willing. Besides, he has a lot of his own affairs recently, and the Qiqu Pavilion is about to open, and the locust eradication plan will be implemented in two days.
　　 Hearing Li Zexuan's refusal, Yan Shaoning sighed: "Oh, that's a shame."
　　 turned his gaze to the drawing again, and Yan Shaoning was puzzled: "Xiaoxuan, what does this isometric side view do?"
　　 "This view is mainly to help the craftsman form a three-dimensional model of an object in his mind, because some objects with a particularly complex structure can hardly be imagined as a three-dimensional model with only three views."
　　 Yan Shaoning nodded thoughtfully.
　　 At this time, Li Zexuan smiled meaningfully: "Brother Shaoning, you only noticed this drawing method, but you ignored the picture itself."
　　 "Oh? Is there any mystery in this? Don't say anything, wait for me to see."
　　 Yan Shaoning re-examined the drawing according to the three-view principle that Li Zexuan just explained to him. After reading it, Yan Shaoning stood up, closed his eyes, and imagined the three-dimensional picture of this thing in his mind.
After a while, Yan Shaoning opened his eyes and said excitedly: "I understand what this thing is, Xiaoxuan, what are you going to do with this thing?" Although he could imagine a three-dimensional model of this thing, he still couldn't think of it. use.
　　 Li Zexuan said with a smile: "I named this thing a ball bearing, brother Shaoning, do you think, if this thing is used for the transmission connection of the wheel and the wheel shaft, what will happen?"
　　 Yan Shaoning himself has a lot of research on mechanical design. Hearing a little bit from Li Zexuan, he immediately understood that he was more excited than before.
"It's amazing. This is simply a genius design. With this ball bearing, all cars in the future, whether they are carriages or trucks, will have very little resistance. How did you come up with this, Xiaoxuan? The invention is so great."
　　 Li Chengqian didn’t understand machinery, and he hadn’t said anything before. At this time, seeing Yan Shaoning was about to blow this thing into the sky, he couldn’t help but wonder: "Shaoning, is this thing so good?"
　　 Yan Shaoning was extremely excited at the moment. Hearing the Prince's question, he affirmed without even thinking:
"Of course, this thing can’t be overstated as my Datang’s most useful invention. Your Royal Highness does not know that if all of my Datang’s cars use this ball bearing for transmission, then the same horse can be used once At least pull more than 50% of the weight of the car.
When the time comes, merchants can transport more goods at a time, and a grain truck can load more grain and grass during wars. In addition to vehicles, other machinery that requires transmission can also use this ball bearing. Your Highness Said this invention is not important. "
Hearing Yan Shaoning’s analysis, Li Chengqian was also stunned. He didn’t care whether the merchants could ship more goods, but this could improve the efficiency of grain transportation in the battle, which is really crucial. In this era, one of the decisive factors for the outcome of war. It's still a matter of food and grass.
　　 Li Chengqian realized that Yan Shaoning’s previous compliments were not excessive at all, and he was a little excited now.
　　 "Brother Ze Xuan, this matter is very important, I wonder if I can let the lonely take it back to the palace?"
　　 Li Chengqian also knows that Li Tai is vying for favor with him recently, but he has no other way. He can't act like Li Tai in front of Li's second eldest grandson, right? If he dare to do this, UU reading www.uukanshu.com will definitely be reprimanded by Li Er that he does not have the authority of a crown prince.
　　 There are things that Li Tai can do, but he cannot do it because he is the prince. Seeing Li Er becoming more and more fond of Li Tai, Li Chengqian was also anxious, but he could only do so.
　　 At this time, seeing that the thing invented by Li Zexuan was so useful, it could even be used in the military, Li Chengqian's first thought was that he might be able to use this thing to make Li Er admire him, and by the way, he could also help Li Zexuan.
　　 Li Zexuan is a little helpless at the moment. Although the ball bearing is indeed extremely versatile, the two people are not so excited, right? Hearing what Li Chengqian meant was to submit the drawing to Li Er immediately, Li Zexuan said quickly:
　　 "His Royal Highness, this ball bearing is indeed very useful, but I don't know if it can be made at this time. I will submit the drawing to your Majesty now, I am afraid it has been too hasty."
　　 When Li Chengqian heard this, he also felt reasonable, and secretly said that he was still too reckless.
　　 "Brother Ze Xuan said that, after you and Shaoning build this thing and install it on the car, you can report it to your father, and then you can give it to the two to ask for help."
　　 Yan Shaoning frowned as soon as he heard Li Zexuan’s words. He was a little too excited just now. He didn't even think about whether this thing could be made. He thought for a while and hesitated:
　　 "Xiao Xuan, this ball bearing is hard to make."
When Li Zexuan proposed this ball bearing before, he didn’t know whether it could be manufactured with the craftsmanship of the Tang Dynasty. Although he was mentally prepared, now he heard Yan Shaoning’s negative answer. There was still a slight disappointment in his heart, but he also thought. Knowing where the technical difficulties are, I asked:
　　 "Brother Shaoning, I don't know where there will be difficulties?"
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