Otaku Engineer in Great Tang Dynasty Chapter 254: New world!

The genius remembers the address of this site in one second: (Top Chinese), the fastest update! No ads! "Let’s take a look at this bar magnet, I will tie it to its center with a wire, and then hang it in the air After it is still, the end that points to the south, I call it the south pole of the magnet, and the end that points to the north is called the north pole of the magnet. Then I put the labels of the north and south poles on both ends of it, green bird, You also follow the steps I just did and mark the north and south poles on the other magnet too!"

In Zuifengxuan, Li Zexuan was carrying a bar magnet and was doing basic physics experiments for the four of them.

"Well, good, come and try Tai!"

Li Tai has read a lot of the Four Books and the Five Classics, but the real experiment has never been done. He was very happy just watching Li Zexuan playing on the sidelines. He had already been gearing up and was hungry and thirsty. Up here.

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 the "s" pole to the magnet in his hand. He was taken aback. This was in the Tang Dynasty. Where did the ancients know "north" and "south", you mark "n" and "s", who knows what it means?

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

"Sir, Tai has also found the South Pole and North Pole, huh~? Sir, what does the text you marked mean?"

Li Tai's hands-on ability is not bad. He found out the north and south poles of the other magnet in a short while, but he looked at the two letters marked by Li Zexuan, and suddenly he was a little confused.

"Do you remember the pinyin of Qingque? The n and b are the first letters of the pinyin of the 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 should I explain it.

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

Li Tae suddenly felt, and then he did the same, marking the north and south poles on 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 want to tell you a very important theorem, that is, magnetic poles of the same **** repel each other, and magnetic poles of the opposite **** attract each other. If you don't believe it, you can try it yourself and see if that's the case!"

"This is what happened? Let me try!"

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

"It's really like this! Sir, why is this? And what does this have to do with the compass indicating the direction?"

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

"Why do people of the same **** repel each other and the opposite **** attract each other? You will slowly think about this later. Of course, you can also understand him as a relationship between people. Generally, men and women are married. Have you seen a man and a man or a woman and a woman getting married?"

Li Zexuan couldn’t explain this problem for a while. At that time, their physics teacher only said that this was a theorem, so that everyone remembered it. As for why the same **** repels each other and the opposite **** attracts each other, how does he know? Able to drive without saying a word!

"Pump!"

Li Yu smiled and said: "Mr.'s statement is really interesting!"

"Ahem, as to what this theorem has to do with the compass, I can only say that it has a lot to do. In fact, the earth can be regarded as a large magnet, one of the poles is located near the geographic north, which can also be called geomagnetic The south pole is located near the geographic south pole, which is the north pole of the geomagnetism. According to the principle of repulsion of same **** and attraction of opposite sex, our magnets and magnetic needles can point to the north-south direction under certain conditions."

Li Zexuan began to popularize the knowledge of the geomagnetic field to them. The children's eyes widened when they heard such a novel theory for the first time.

"How is it possible? How can the earth where we stand is a magnet?"

Li Tai muttered to himself, with a face of disbelief, this shocking remarks simply subverted his worldview.

"Haha!"

Li Zexuan smiled and didn't say much. He walked to the nearby cases and began to draw pictures. A compass that is really used for navigation can't be so crude and crude, and so lacking in technology.

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 not only the balance of the needle, but also the friction during rotation.

Li Zexuan designed the shaft to be a stepped shaft, 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, tried to deform the thin shaft end, and riveted the magnetic needle to the thin shaft On the top, control the deformation of the thin shaft end to prevent the magnetic needle from being riveted. At this time, the magnetic needle can rotate around the thin shaft, but can not leave the thin shaft. As for the cover of the compass dial, only glass can be used.

Before I was lazy and didn't make glass. I didn't expect that it still can't get around glass now, so let's make glass by the way this time!

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

"Sanbao, go and invite Fu Bo!"

"Yes, master!"

Sambo replied and hurried out of the courtyard to find Uncle Fu.

After a while, Fober walked in and asked: "Master, are you looking for me?"

"Well, Fu Bo, first see if this thing can be made."

Li Zexuan handed the drawings of each part of the compass to Fu Bo and said.

Fuber took the ~IndoMTL.com~ carefully looked at it, pondered for a moment, and finally nodded and said, "It should be possible, but it's very troublesome. Master, there are many fine small parts in this thing you painted. If you want to do it exactly, you have to make it yourself by those old craftsmen who have been more than ten years old!"

Li Zexuan heard this, patted his head and almost forgot. 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 takes only a few seconds. Things, but for the ancient craftsmanship that completely relied on pure hand polishing, it was really a big difficulty.

"Fu Bo, please organize a group of experienced old craftsmen as soon as possible to let them put down their work and concentrate on making a batch of compasses first. Oh, I forgot to tell you. This thing is called a compass. What your majesty is eager to ask for, this time the navy marches south, the imperial court mainly relies on this thing to distinguish the direction in the vast sea, and let the craftsmen hurry up. You can make one more, and then maybe you will save another boat. Life!"

Li Zexuan said with a serious expression, if you have any difficulties, you will have to overcome difficulties. Although there were no modern crafts and equipment in ancient times, there were so many skillful craftsmen. Many ancient crafts or buildings, modern people can't make them just by relying on machinery.

Fu Bo previously thought that Li Zexuan came here today as before. He was purely trying to make some novel things for himself, but he did not expect Li Zexuan to bring such an important task today. After he heard it, he hurriedly A solemn expression:

"Don't worry, young master, you will come to the workshop and make a batch of compasses!"

…………………

First!

Thank you for a goodbye, love you for my reward!

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