Start with a photographic memory and build a memory palace

Chapter 43 Compass
……

Inside the tent.

Wu Wen is polishing a magnetic needle.

From time to time, he measured the length of the magnet with a ruler and placed it on a stretched string to see if its balance point was exactly in the center.

"Awen, what are you doing?"

At this time, Master Zhu Jiu limped into the tent, saw his strange behavior, and asked in confusion.

"Master Jiu, how is your injury?" Wu Wen stood up to greet him.

"It's almost healed." Master Zhu Jiu pointed to the wound on his leg and said.

Although this was in the early Tang Dynasty, there was actually surgical technology that used mulberry bark thread to suture wounds.

Mulberry bark thread is taken from the root bark of mulberry tree. It is simple to make, easy to use, and not easy to break. It has the effects of clearing away heat and detoxifying and promoting wound healing.

"What are you making?" Master Zhu Jiu looked at the needle in Wu Wen's hand and asked again.

"Oh, this is a magnetic needle. I'm making a compass!" Wu Wen answered, holding the thin needle in his hand.

As he spoke, he took it and put it aside. It was made of a whole piece of wood, about the size of a washbasin, and had symbols of the Heavenly Stems and Earthly Branches, the Five Elements, the Eight Trigrams, etc. carved in a circular shape on it.

There is a circular groove in the center, which is where he plans to place the magnetic needle.

"compass?"

Looking at what Wu Wen was holding, Zhu Jiuye repeated the question in confusion.

Afterwards, he stopped paying attention, sat down to the side, and said to Wu Wen earnestly:

"Awen, you are now a captain and you are in charge of this battalion. I think you should stop doing these little things and handle the military affairs of the battalion instead of leaving everything to that guard Deng."

Wu Wen naturally understood what Jiu Ye meant. He hoped that he would focus on the right path, do some real things, and keep the military power in his own hands.

"Master Jiu, you know that I have a casual personality and am not interested in management matters at all.

Moreover, Deng Dayong was arranged by His Royal Highness the Prince of Qi. The fact that I was able to transform myself into a captain and be in charge of a battalion of soldiers was also the order of the Prince of Qi.

Therefore, I will leave the affairs of the camp to Deng Dayong, and I can have some free time to do what I want to do. "

"Oh!" Upon hearing this, Master Zhu Jiu let out a long sigh.

Since Wu Wen said so, he didn't ask any more questions.

His eyes returned to the compass in Wu Wen's hand.

"What did you make this for?"

"this?"

Wu Wen raised his hand and held up the compass, smiling and saying, "This is used for measuring and positioning. It is not ready yet. I will show it to you when it is finished."

Master Zhu Jiu shook his head to indicate that he didn't understand, then limped out of the tent.

Wu Wen returned to his seat and continued to polish the magnetic needle.

The compass he's working on, specifically, is his tool for detecting and locating electromagnetic fields.

To achieve electromagnetic wave transmission between the human body and the electromagnetic field, the key is to make the human body's biological electromagnetic field and the external electromagnetic field form the same frequency resonance.

The electromagnetic field, as an invisible physical field, cannot be seen directly by the human eye.

Therefore, Wu Wen intends to use the property of magnets that can deflect under the influence of electromagnetic fields to indicate the direction and intensity of the electromagnetic field and make it concrete.

Then, by controlling itself, it resonates with it at the same frequency and realizes electromagnetic wave energy transfer.

—

Two hours later.

Wu Wen finally polished the magnetic needle.

Carefully put it into the compass, and the compass is now complete.

At this time, night had fallen. Wu Wen walked out of the tent holding a compass in his hand and looked up at the bright starry sky.

In the eyes of someone like him who understands numerology and astronomy, these stars connected to each other form a complex and mysterious star map.

Astrological maps have many functions, such as determining directions, determining seasons, and even predicting celestial phenomena.

At this moment, he looked up at the star map above his head, then slowly turned his body until he was facing due north.

Then, he looked down at the compass in his hand and matched the symbols of the Heavenly Stems and Earthly Branches, the Five Elements and the Eight Trigrams engraved on it with the star map above his head.

Since the earth is a huge magnet with a strong magnetic field, although the magnetic needle in the compass will deviate, it can still basically point accurately to the north and south.

After testing, Wu Wen confirmed that the compass he made was of good quality, so he took it back to the tent with satisfaction.

A good night's sleep.

the next day.

Wu Wen started to get busy again and started to make another auxiliary tool.

He found an iron plate, placed it between two magnets, and used iron wire to connect it to a coil of iron wire wrapped around a wooden stake.

This is a simple power generation device, and also an electromagnetic coil device.

When the iron disk rotates between the magnets, it cuts the magnetic lines of force, thereby generating an electric current. When the current enters the metal coil, an electromagnetic field is formed.

Before I knew it, another busy day had passed.

Arrived the next day.

Wu Wen invited Master Zhu Jiu.

"Master Jiu, I have something I want to ask you for help with."

"what's up?"

"Hold this handle in your hand and rotate it hard. Keep rotating it and don't stop." Wu Wen said, pointing to the handle connected to the iron coil.

Although Master Zhu Jiu was somewhat puzzled by Wu Wen's request, he still grasped the handle and twisted it vigorously.

Wu Wen held the compass in his hand, concentrating on finding the direction.

As the iron coil was energized, an electromagnetic field was quickly formed, and the magnetic needle in the center of the compass also changed significantly, no longer pointing to the originally fixed south and north directions.

Wu Wen held the compass firmly and carefully adjusted his pace according to the new direction of the magnetic needle.

Every step he took would cause the magnetic needle to deflect again due to changes in the electromagnetic field, and he would constantly adjust his direction based on these subtle changes.

In the eyes of Master Zhu Jiu, his behavior was full of mystery. He held a compass and slowly rotated it around the wooden stake where the magnetic coil was located, as if he was performing a ritual.

However, in Wu Wen's mind, a clear model of electromagnetic fields was gradually taking shape.

Under the action of the electromagnetic field, the magnetic needle will deflect, and the angle and direction of the deflection are directly affected by the strength and direction of the electromagnetic field.

Therefore, by observing the deflection of the magnetic needle, we can not only sense the existence of the electromagnetic field, but also accurately infer and judge its direction, strength, and distribution.

soon.

Half an hour passed.

As Wu Wen never stopped shaking, Master Zhu Jiu's arms became sore.

"Okay, Master Jiu, stop and take a rest!"

As Wu Wen stopped, Master Zhu Jiu was finally able to relax his arms.

"Sorry to trouble you." Wu Wen said apologetically.

"It's nothing!" Master Zhu Jiu shook his arms nonchalantly.

Then, Wu Wen said a little embarrassedly: "Master Jiu, I'm afraid I will have to trouble you more in the next few days!"

……

(End of this chapter)