After dinner, Jiayi brought a platter and Kissin to the ship's side.

"Jiayi, what is your array plate for? Does it have anything to do with bats?" Kissin looked at the so-called array plate in Jiayi's hand. He didn't understand this, but he just looked very strange. This was a two-dozen disk, and one dozen was the distance between the palm of his palm and the middle fingertip, which looked about 20 centimeters.

The array plate is not thick, no more than the thickness of four nails. It is covered with mysterious patterns, with white metal filling inside, and four gems between the four corners, which looks more like a craft.

He didn't know that those white metals were mitral alloys. The filling of the array disk constructed a magic power. The reason why Mitsunian alloys were used was of course because it was so cheap. There was also a small horn-like thing on the outermost part of the array disk, which made the array disk look like a turtle shell, and the horn in front was the head.

Jiayi held the array disk and said to Kissin: "This is used to simulate the sound of a bat. Then the array disk will receive the waves emitted by the sound, and then it can detect if there is anything in front of it."

"Why imitate bats to make sounds? Is it useless?"

"Bats can see things at night, not because their eyes can see things in the dark, but because their mouths can make sounds. When they hit an obstacle, they will reflect back and hear it when they are heard by their ears, and they will know that there is an obstacle in front of them."

As soon as Jia explained, he saw Kissin's confused look and knew that he still didn't understand.

"It's like an echo. You know, you can hear an echo in the canyon. The speed of the sound is the same. According to the time of the echo, we can know how far the obstacles ahead are. The same is true for bats, but the sound of bats cannot be heard by human ears, so people did not find that bats are located by sounds."

Kissin felt that he understood a little, but he still couldn't accept it. He had never heard of seeing it with his ears: "Can you really see it with his ears?"

"Your martial arts are pretty good, right?" Jia nodded when he saw Kissin and continued, "Do you have that feeling? When someone wants to attack you, you will have a sense. When you hear the sound, you can find someone on which side?"

Kissing continued to nod.

"Is that right? You don't see it through your eyes? So it's really not a big deal to see it with your ears. As long as you feel it's sharp enough." Jiayi actually changed his concept, but after saying this, Kissin would be much easier to understand.

Jiayi didn't want to explain this thing anymore. Kissin lacked the corresponding foundation. Just know a rough idea. If you want to explain it clearly to him, Jiayi didn't have the ability to do so.

Jiayi picked up the array plate and was about to activate the magic array, but suddenly remembered something. Is the sound here still a transmission speed of 340m/s? If it is in water, what is the speed? If this is also wrong, the measurement distance will be too big.

Jia thought about it and decided that it would be better to measure it yourself.

He asked the boat to drop a small boat, came to a relatively flat cliff, then ran to the other side, used magic to measure the distance, and determined the distance. He used his array disk to aim at the opposite cliff to emit ultrasonic waves, and at the same time started timing with an hourglass. After receiving the returned ultrasonic wave, he stopped to count. After dividing the distance by time and then divided by two, he obtained the transmission speed of the sound, which was not much different from that of the earth, about 360m/s, which was 20 meters per second faster than on the earth, and the gap was not large.

After calculating the transmission speed of good sound, Jiayi continued to test his own detection array disk. At least it was very useful when it was used to measure the speed of sound. I think there is no problem using it as a sonar radar.

When Jiayi returned to the big ship, many sailors had already surrounded him because he heard that Master Jiayi wanted to see things with his ears, and everyone was surprised.

"Get out of the way, get out of the way, don't get in the way."

"Jiayi, how do you use this thing? Can you really see it? Use the sound?" Even the captain heard the sound of the wind and came over to watch it.

Jiayi also saw the boredom of sailors. He said: "This is still a primary version. In theory, you can only find things on the water surface. After improvement, you can find things on the water surface, and you can also find things under the water. Even at night or when you have bad vision, there is no problem."

After saying that, Jiayi came to the side of the ship and lined up the sailors around him, only Kissin and two captains were by his side.

Jiayi lifts the array disk and after activation, a ray of light and shadow rises on the array disk. Theoretically, this light and shadow are used as a display screen to display the real-time dynamics around it according to the feedback from sound wave detection. Unfortunately, it has not been completed yet, so it can only display a line or a point.

After the array disk was activated, ultrasonic waves began to be released intermittently from the small speaker, and the rest could not feel anything. However, Jiayi himself used listening techniques, so he could hear intermittent sound waves transmitted out.

The sound waves transmitted quickly received feedback. They were cliffs on both sides of the shore. Two irregular lines were displayed at both ends of the display screen, symbolizing the cliffs on both sides. Then, some sporadic highlights appeared, these were ships in the river. But in addition to these, there were many miscellaneous points, which were the background noises caused by multiple reflections and should be filtered out.

Although it has not reached the point of holographic images, Jiayi is already quite satisfied with this now, at least he looks a little bit, right?

"This point should be a ship, which is opposite to us. According to the reaction time, it should be 2 miles away." Jiayi said, pointing to a larger dot closest to him.

"Come and go to the observation deck to see if there is a ship right in front of the waterway?" Captain Heulette said.

After hearing his words, a sailor immediately climbed onto the mast on the boat and looked straight ahead. It would be great if there was a telescope, so that he could see further, so he would not have the energy to do it. Jiayi didn't know that there was a telescope, but he just didn't know it.

However, the two miles of road was not far. After the sailor went up, he searched casually and saw a large ship coming towards him, which was almost the same as what Jiayi said according to his visual observation.

The sailor immediately told the people below.

"This can really be detected. Is it really detected through sound? Why can't I hear it?" asked Captain Hewlett.

"People can only hear some of the sounds. If the frequency of the sound is too high or too low, they will not be able to hear it. Even if this detection array makes a high-frequency sound, you can't hear it."

Jiayi explained, but no one could understand. Seeing their blank look, Jiayi could only explain simply: "This is magic!"

Oh, now everyone understands it. Isn’t it better to say that this is magic? Everyone can understand it. After saying so much before, it just makes everyone confused.
Chapter completed!