I am a primitive

I saw Dashenzi Han went outside, brought another bowl, which was filled with more than half of the bowl of water, and put it on the table in front of him.

Then sit in front of the table, pick up an iron needle and put it on a small magnet, and rub it back and forth.

This matter went on for about a minute, Han Cheng stopped his movements, took the rubbed iron needle, and moved to the side of another iron needle.

Then a miracle happened, the needle was directly sucked up by Han Cheng's iron needle.

Seeing such a scene, Wu who was standing by the side couldn't help but widen his eyes.

This is really quite miraculous, the son of God just rubbed the iron needle in his hand against the magnet, and this ordinary iron needle also has the characteristics of this magnet, and can also give the iron needle to the magnet. sucked!

Under Wu Man's curious gaze, Han Cheng put aside the iron needle that had been checked and confirmed to be magnetized.

Then pick up a piece of paper on the side and fold a crease about two centimeters wide and five centimeters long by hand.

After folding it, use the scissors placed on the side to cut it out.

Then thread the iron needle that has been magnetized along the length of the paper strip.

Among them, the two ends of the iron needle are on one side of the paper, and the middle section of the iron needle is on the other side of the paper strip.

After adjusting, Han Cheng picked up the quill pen again, dipped in the ink, and wrote the characters "North and South" on both ends of the paper.

After writing, I picked it up and carefully placed it squarely on the bowl of water that was already very stable.

The side with the word "North and South" facing up.

When putting the note with the magnetized iron needle into the pottery bowl, Han Cheng deliberately didn't put it straight, but put it facing east and west.

After putting it in place, amazing things happened.

This note was originally oriented east-west, but after it hit the water, it automatically began to rotate slowly.

After turning a small half turn, the magnetized needle, together with the strip of paper worn on the needle, turned to face east and west, and stopped there firmly without moving.

It's just a little embarrassing that the end of the note marked with south is firmly pointing to the north, and the side marked with north is also pointing to the north.

Even if Han Cheng gently touched it a few times with a small wooden stick, it was still extremely stubborn with the small note on the anvil.

After the thing stopped, it was still the same as before. The end marked with south was firmly pointing to the north...

Standing on the side, with a very reverent mind, the witch, who was full of novelty and was ready to watch and increase his knowledge, was a little dazed for a while when he saw the scene in front of him.

What is this all about?

Doesn't it mean that after this thing is done, it can always point to the south?

Why is the north-south direction wrong?Still can't correct it?

In Wu's bewilderment, as the person who personally did this, Han Dashenzi sniffed in embarrassment.

He used two small wooden sticks to pick up the small piece of paper and the iron needle floating there like vegetables.

At this time, after the note floated on the water for a while, it had become limp.

Under such circumstances, it is impossible to reuse it.

Han Chengcheng started again and cut a strip of paper with similar specifications from the paper on the side. The two ends of one side of the strip were still written with the characters "North and South".

After writing it, Han Cheng pulled the iron needle off the wet note, and then threaded it on the note in the same way as before.

The only difference is that this time when Han Cheng threaded the iron needle on the note, he turned the iron needle around.

After doing all this, Han Cheng started again and carefully placed the piece of paper on the water in the bowl.

This time, Han Cheng deliberately placed the end with the word "South" facing north, and then things became different.

Driven by the iron needle, the piece of paper began to rotate, and it stopped after turning half a circle on the water surface.

Then the side with south on it points to south, and the side with north on it points to north.

Even if you use a small stick to move it, after the little note stops, it can still point north and south firmly.

It was a success.

Looking at the scene in front of him, Wu also felt novelty, but despite the novelty, he still felt a little disappointed.

Because there is a big gap between what I see in front of my eyes and what I think in my heart and the miraculous effects that the Son of God said, it is really too crude.

Han Cheng naturally knew what Wu was thinking.

Because when I was in the second grade of elementary school, I made this after some hands-on work. While feeling novel, I also had the same idea.

After all, the compass makes people feel extraordinarily tall when listening to it.

And this method of making it with a bowl of water, a small piece of paper, and an iron needle rubbed against a magnet is indeed very different from the magical instrument in imagination. difference.

"Wu, this is the most basic thing. It is used to prove whether this thing is easy to use. To make a convenient and easy-to-use compass, a lot of things need to be done.

After all, such a compass is too simple and inconvenient to use. "

Han Cheng smiled and said to Wu...

As for the compass, Han Cheng learned how to make it from the bottom of a can in the hands-on practical class of later generations.

At that time, many people, including Han Cheng, were very happy to use the bottom of the can as a compass.

After all, when he was young, he was still in an era when supplies were relatively scarce.

At that time, except for a few families, many families did not have cans.

In the school's practical class, it is necessary to use cans and bottles.

Under such circumstances, the students can justly ask for some money from their families to buy a can of soda that makes people crave for existence on weekdays. How wonderful!

Of course, at this time of day, the cans and the soda in them are out of the question.

However, without the bottom of the can, it was also difficult for Han Cheng. After all, many things in the tribe have gradually developed.

Now there are two things in front of Han Cheng that are very similar to the bottom of a can.

It's just different from the aluminum or aluminum alloy material at the bottom of the can.

The two objects in front of Han Cheng, which looked exactly the same size and shape, were made of copper.

It was drawn by Han Cheng, and he explained it in detail to Heiwa, a tribe who made ceramics and molds, and was a master among the tribes. After some exploration, manufactured.

Behind the two copper objects placed in front of Han Cheng, there are many defective products that have been melted away.