Otaku Engineer in Great Tang Dynasty

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"Look at this bar magnet, I tied a wire to the center of it, and then hung it in the air. After it is stationary, the end that points to the south, I call it the south pole of the magnet, the one that points to the north. One end is called the north pole of the magnet. Then I will label the north and south poles on both ends of it, Blue Sparrow, you can also follow the steps I just took and label the other magnet with the north and south poles!"

In Zuifeng Xuan, Li Zexuan was carrying a bar magnet and was doing the most basic physical experiments for the four of them.

"Okay, let's try Tai too!"

Li Tai has read a lot of the Four Books and Five Classics, but the real experiment has never been done. He just watched Li Zexuan having a good time, he was already gearing up, and he was hungry. Hearing this, he rushed up immediately.

Li Zexuan smiled and let the little fat man play slowly by himself. He went to get two small pieces of paper and was about to attach the "n" pole and "s" pole to the magnet in his hand. In the Tang Dynasty, where did the ancients know about "north" and "south", who knows what it means when you mark "n" and "s"?

In desperation, he shook his head and could only write "n" and "b" at the ends of the north and south poles, just use the pinyin initials of south and north! Alas, trouble! Many scientific terms and terms in later generations have various English abbreviations. What can we do in the future? Thinking of this, Li Zexuan couldn't help but feel a pain in his head. It seems that there is still a long way to go to improve the scientific and technological level of Datang!

"Sir, Tai has also found the South Pole and North Pole, eh~? Mr., what do you mean by this word?"

Li Tai's hands-on ability is not bad, and he found the north and south poles of another magnet in a short while, but he looked at the two letters of Li Zexuan's logo and suddenly became a little puzzled.

"Qing Que, do you still remember the pinyin? These n and b are the first letters of the pinyin of south and north. For the convenience of marking, we will use these two letters to replace the north and south poles in the future!"

Li Zexuan couldn't help but feel grateful for his wit just now, otherwise if he wrote "n" and "s", how would he explain it.

"Oh~! So that's the case, Mr. Tai also finds it very convenient!"

Li Tai was stunned, and then he followed suit and marked the north and south poles of the magnet in his hand. At this time, Li Zexuan took the two magnets in his hand, looked at the four of them, and said:

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

"What happened? I'll try it!"

Li Yu took two magnets and started the experiment. Although she didn't know pinyin, she could still distinguish whether the two letters were the same.

"It's really so! Sir, why is this? And what does this have to do with the compass being able to point the way?"

After playing with the magnet twice, Li Yu tried the result predicted by Li Zexuan, and then she asked.

"Why do same-sex repel and opposite-sex attract each other? You can think about this question later. Of course, you can also understand it as a relationship between people. Generally, men and women get married. You have never seen a man. Married with a man or a woman with a woman?"

Li Zexuan couldn't explain this question for a while. At that time, their physics teacher only said that this is the theorem, and let everyone remember it. As for why the same sex repels each other and the opposite sex attracts, he doesn't know, he can only say a word. If it doesn't fit, drive!

"Push!"

Li Yu smiled and said, "Sir's statement is really interesting!"

"Cough, as for what this theorem has to do with the compass, I can only say that it has a lot to do with it. In fact, the earth can also be regarded as a large magnet, one of which is located near the geographic north pole, which can also be called the geomagnetic south pole. , and the other pole is near the geographic south pole, which is the north pole of the geomagnetic field. According to the principle that likes repel and opposites attract, under certain conditions, our magnets and magnetic needles can just point in the north-south direction.”

Li Zexuan began to popularize the knowledge of the geomagnetic field to them. When several children heard such a novel theory for the first time, their eyes widened.

"How is that possible? How can the earth we stand on be a magnet?"

Li Tai muttered to himself with a look of disbelief. These shocking remarks simply subverted his worldview.

"Ha ha!"

Li Zexuan smiled and said nothing. He walked to the nearby cases and began to draw. A compass that is really used for navigation can't be so rough, so untechnical.

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

Li Zexuan designed the central shaft as a stepped shaft, and drilled a hole slightly larger than the diameter of the thin end of the stepped shaft at the center of gravity of the magnetic needle. After passing the magnetic needle into the thin shaft, he tried to deform the thin shaft end and riveted the magnetic needle on the thin shaft. Control the deformation of the thin shaft end, so that the magnetic needle is not riveted. At this time, the magnetic needle can rotate around the thin axis, but cannot be separated from the thin axis. As for the cover of the compass dial, only glass can be used.

I was lazy before and didn’t make glass, but I didn’t expect that I still can’t get around glass, so let’s make glass by the way!

Thinking of this, Li Zexuan raised his head and said:

"Sanbao, go and invite Uncle Fu!"

"Yes, Master!"

Sanbao responded, and hurriedly ran out of the courtyard to find Uncle Fu.

After a while, Forber walked in

Come and ask, "Master, are you looking for me?"

"Well, Uncle Fu, let's see if this thing can be made."

Li Zexuan handed the drawings of various parts of the compass to Fu Bo and said.

Uncle Fu took it, looked at it carefully, pondered for a moment, finally nodded, and said, "It should be possible, but it's very troublesome, young master, there are many fine small parts in this thing you painted, if you want to do it exactly To come out, those old craftsmen who have been more than ten years must do it themselves!"

Hearing this, Li Zexuan patted his head and almost forgot that some components in this compass are almost equivalent to a small precision instrument. For a modern industrialized society with various lathes and machine tools, it only takes a few seconds, but For the ancient craftsmanship that completely relied on pure manual polishing, it was really a big difficulty.

"Uncle Fu, organize a group of experienced old craftsmen as soon as possible, let them put down their work first, and concentrate on making a batch of compasses first, oh, I forgot to tell you, this thing is called a compass, and His Majesty is in a hurry. Yes, this time the imperial court sailed south, mainly relying on this thing to identify the direction in the vast sea. You ask the craftsmen to hurry up, you can make one more now, and you may save an extra boat of lives by then. what!"

Li Zexuan said with a serious look, if you have difficulties, you can overcome them. Although there were no modern crafts and equipment in ancient times, there were so many skilled craftsmen. Many ancient handicrafts or buildings could not be made by modern people even by relying on machinery.

Uncle Fu thought that Li Zexuan came here today as before. He just wanted to make some novel things for himself, but he didn't expect Li Zexuan to come with such an important task today. road:

"Don't worry, young master, the workshop will definitely be united in the past few days to make a batch of compasses!"

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