Otaku Engineer in Great Tang Dynasty

"Look at this strip Magnet, I tied it to its center with a wire, and left it empty. When it was still, point to the southern end. I call it the South Pole of Magnet, pointing to the north. At that end, it is called Magnet's North Pole. Then I put the label of South North Pole on both ends of it, Qingque, you also follow the steps I just made, and also labeled another Magnet with North North Pole!"

In the drunkenness, Li Zexuan carries a strip of Magnet and is doing the most basic Physics experiments for the four of them.

"Well, Thai is also coming!"

Li Tai Four Books of Confucianism The Five Classics of Confucianism has read a lot, but the real experiment has never been done. He just watched Li Zexuan playing very happy. He has been gearing up for a long time, and he is hungry and thirsty. Hear this, immediately rushed up.

Li Zexuan laughed, let Little Fatty play slowly, he went to get two small pieces of paper, ready to give Magnet in his hand, when you put "N" pole and "S" pole, suddenly a glimpse, this is in Tang Generation, where the ancients knew "North" and "South", who do you mean by "N" and "S"?

In desperation, he shook the head, can only write an "N" and "B" on both ends of the South North Pole, just use the pinyin initials of the South and North! Oh, trouble! Many scientific terms and terminology in later generations have various English abbreviations. What can I do later? Thinking of this, Li Zexuan can't help but feel a bit of brain pain, it seems that to upgrade the technology level of Great Tang, still have a long way to go!

"Sir, Tai also finds South Pole and North Pole, oh~? Mr., what do you mean by this text?"

Li Tai's ability to do it was OK. After a while, I found another South North Pole of Magnet, but he looked at the two letters of Li Zexuan and suddenly got some doubts.

"Qingque Do you still remember Pinyin? These N and B are the initials of the South and North Pinyin. For the convenience of marking, we will use these two letters instead of South North Pole!"

Li Zexuan couldn't help but be grateful for the wit, or else if he wrote an "N" and an "S", then how to explain it.

"Oh~! It turns out that Mr. said this, Tai also feels very convenient!"

Li Tai was stunned, and then he also had the same kind of proof, and the Magnet in his hand was marked with South North Pole. At this time, Li Zexuan took two Magnets in his hands and looked toward them. He said:

"Next, I want to tell you a very important theorem, that is, the same magnetic poles are mutually exclusive, and the opposite magnetic poles attract each other. If you don't believe it, you can try it yourself and see if this is the case!"

"Is there such a thing? I will try it!"

Li Yu took two Magnets and started the experiment. Although she didn't know Pinyin, the two letters were the same, she could still tell.

"It's really like this! Sir, why is this? Then what does this have to do with Compass's direction?"

After Li Yu played the two Magnets, she tried the results predicted by Li Zexuan, and she asked.

"Why would you like polarities repel each other, the opposite sex sucks, this question is slowly thought of behind you, of course, you can also understand him as the relationship between people, usually male and female, you never look Have you been a male or a male or a female and a female?"

Li Zexuan also explained this question at a time. At the time, their Physics Teacher only said that this is the theorem, so that everyone can remember it. As for why it would be like polarities repel each other in nature, the opposite sex sucks, he knows, only Can drive without saying a word!

"puchi!"

Li Yu smiled and said: "Mr. this is really interesting!"

"cough cough, as for the relationship between this theorem and Compass, I can only say that there is a big relationship. In fact, Earth can also be regarded as a big Magnet, one of which is near Geography North Pole, which can also be called Geo- Magnetic's South Pole, the other pole is near Geography South Pole, which is Geo-magnetic's North Pole. According to like polarities repel each other, the opposite sex of the Theory, our Magnet and magnetic needle under certain conditions, just right Can point to the north-south direction."

Li Zexuan began to give them a general knowledge of Magnetic Field, and several children first heard such novel theories, stared wide-eyed.

"How is it possible? How can we be a Magnet?"

Li Tai muttered to himself, and his face was unbelievable. This shocking remark made him subvert his view of World.

"hehe!"

Li Zexuan paid a smile and said nothing. He walked to the nearby case and began to draw pictures. The Compass that is really used for navigation can't be so rough and simple, so there is no technical content.

In fact, in addition to the magnetic needle, the core part of the Compass is to count its central axis. It is necessary to consider the balance of the needle and the friction during rotation.

Li Zexuan designed the center shaft as a stepped shaft. Drill a hole slightly larger than the diameter of the thin end of the step shaft at the center of gravity of the magnetic needle. After the magnetic needle is introduced into the thin shaft, try to deform the thin shaft end and rive the magnetic needle on the thin shaft. , control the amount of deformation at the end of the thin shaft, so that the magnetic needle is not riveted. At this point, the magnetic needle can rotate around the thin axis and cannot be separated from the thin shaft. As for the cover of the Compass dial, only glass can be used.

I used to be lazy and didn't make glass. I didn't expect that I couldn't get around the glass now. Then I will make the glass by the way!

Thinking of this, Li Zexuan looked up instructed:

"Sanbao, please come over Uncle Fu!"

"Yes, Young Master!"

Sanbao complied, quickly ran out of the small courtyard and went to Uncle Fu.

After a while, Uncle Fu came in and asked, "Young Master, are you looking for me?"

"Well, Uncle Fu, you can see if this thing can be made."

Li Zexuan handed the drawings of the Compass parts to Uncle Fu and said.

Uncle Fu took it over and looked at it carefully. After a moment of indulging, he finally nodded and said: "It should be OK, but it is very troublesome. Young Master, there are many fine small parts in this thing you want to draw. If you do it, you have to go to the old craftsmen who have been working for more than ten years!"

Li Zexuan hearing this , pats head, almost forgot, some of the Compass components are almost equivalent to a small precision instrument, for a modern industrial society with various lathe machines, it is a matter of seconds, but for In the ancient history of relying entirely on pure hand-grinding, it is really a big difficulty.

"That Uncle Fu, you will organize a group of experienced old craftsmen as soon as possible, let them put down their work first, concentrate on doing a batch of Compass first, oh, forget to tell you, this thing is called Compass, it is Your Majesty The Imperial Court, the water court, is mainly relying on this thing to identify the direction in the sea. You let the craftsmen grasp it, you can make one more now, and maybe you will save one more person. Life!"

Li Zexuan expression Strictly said, if there are difficulties, then overcome the difficulties. Although there are no modern crafts and equipments in ancient times, there are so many skilled craftsmen, many ancient handicrafts or buildings, modern people rely on machinery and can not make it.

Uncle Fu thought that Li Zexuan came here today, just like before. He just wanted to create some novel things for himself, but he didn't expect Li Zexuan to bring such an important task today. After listening to it, he quickly expressed One way to clean up:

“Young Master rest assured that Workshop will be up and down in the past few days, and make a batch of Compass!”

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