Chapter 254: New world!

A genius remembers the address of this site in one second: (Vertex Chinese), the fastest update! No ads! "Let’s take a look at this bar magnet, I will tie it to the center of it with a wire, then hang it in the air, and wait for it 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. I just marked the north and south poles on the other magnet!"
In Zuifengxuan, Li Zexuan was carrying a bar magnet and was doing the most basic physics experiments for the four of them.
"Good, good, come and try Tai!"
Li Tai has read a lot of the Four Books and the Five Classics, but he has never done any real experiments. He had just watched Li Zexuan playing on the side and was very happy. He was eager and hungry for a long time. At this moment, he immediately rushed up.
Li Zexuan smiled and let the little fat man play slowly by himself. He went to get two small pieces of paper and prepared to attach the "n" pole and "s" pole to the magnet in his hand. He was taken aback. In the Tang Dynasty, where did the ancients know "north" and "south", you marked "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 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 was not bad, and 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 became a little confused.
"Qingque, do you remember the pinyin? These n and b are the first letters of the pinyin for 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 being thankful for his wit just now, otherwise, if he wrote "n" and "s", how would I explain it?
"Oh~! That's how it is, Mr. Tai also finds it convenient!"
Suddenly Li Tai, and then he followed the same pattern, 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, the magnetic poles of the same repel each other and the 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!"
"There is such a thing? I will 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 that! 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 same-sex repulse and opposite-sex attract each other? You will gradually think about this later. Of course, you can also understand him as a relationship between people. Generally, men and women are married. You have never seen men. Are you married to a man or a woman to a woman?"
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, he doesn’t know, he can only say a word. If you don’t agree, just drive!
"Pump!"
Li Yu smiled and said, "Mr.'s statement is really interesting!"
"Ahem, as for 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 which is located near the geographic north pole, and there can also be called the geomagnetic south pole. One 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 in 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, these shocking remarks simply subverted his worldview.
"Ha ha!"
Li Zexuan smiled and didn't say much. He walked to the nearby cases and began to draw pictures. The compass that is really used for navigation can't be so crude and crude, 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. The deformation of the thin shaft end prevents the magnetic needle from being riveted. At this time, the magnetic needle can rotate around the thin axis, but can not leave the thin axis. 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 glass can't be bypassed now, so let's make glass by the way this time!
Thinking of this, Li Zexuan raised his head and said:
"Sambo, go get Uncle Fu over!"
"Yes, master!"
Sambo responded and hurried out of the courtyard to find Uncle Fu.
After a while, Fu Bo came 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.
Fubo took the ~EbookFREE.me~ and looked at it carefully, pondered for a moment, and finally nodded and said: "It should be possible, but it is very troublesome. Master, there are many fine parts in this thing you painted. If you want to make it exactly, you have to make it yourself by those old craftsmen who have been more than ten years old!"
Li Zexuan patted his head when he heard the words, 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, but For the ancient craftsmanship that completely relied on pure hand polishing, it was really a big difficulty.
"Then Fu Bo, please organize a group of experienced old craftsmen as soon as possible, let them put aside their work, concentrate on making a batch of compasses first, oh, I forgot to tell you, this thing is called a compass, your majesty is in a hurry Yes, this time the navy marched south, the imperial court mainly relied on this thing to discern the direction in the vast sea, and let the craftsmen hurry up. If you make one more, you might save one more boat's life by then! "
Li Zexuan said with a serious expression, if you have any difficulties, you will be able to overcome difficulties. Although there were no modern crafts and equipment in ancient times, there were so many skilled craftsmen. Many ancient crafts or buildings were made by modern people only by relying on machinery.
Fubo previously thought that Li Zexuan was the same as before, just wanting to make some novel things for himself, but he did not expect that Li Zexuan had brought such an important task today. After listening to it, he quickly looked down. Road:
"Master, don't worry, everyone in the workshop will be united in the past few days to make a batch of compasses!"
…………………
First!
Thank you a, goodbye, love you for my reward!
(End of this chapter) Mobile users, please browse and read for a better reading experience.