The Tang Dynasty started from saving Empress Changsun

Chapter 267 Gramophone
After tightening the clockwork, Chen Jingke said to Xiao Si: "Are you ready, it's about to start."

Xiao Si nodded her head solemnly and said, "Okay."

Chen Jingke flicked the switch, and the spring rebounded to drive the gear to rotate at a constant speed.The gear drives the belt, the belt drives the wheel at the other end, and the glass turns at a constant speed.

The childish singing of the little Sizi sounded: "I have a little donkey, and I never ride it... It crashed and threw me all over the mud."

When the singing ended, Chen Jingke also pressed the switch, and the glass stopped spinning.

Then he boasted: "Little Si sings really well."

Others also applauded: "Little Si sings really well."

The little Si was both happy and shy.

After complimenting his own sister, Li Tai couldn't wait to ask: "Why did you let Xiao Si sing to this paper cup? And then?"

Chen Jingke said: "Don't worry, you will know soon."

After finishing speaking, he reset the glass, re-wound the clockwork, and said to everyone: "All ears are pricked up, the time to witness the miracle has come, don't be frightened."

Then flip the switch again, and the glass spins.

Just when everyone was wondering, a familiar singing voice came out from the paper cup: "I have a little donkey, I never ride..."

Although the voice was very weak, with noise and slight distortion, it was still possible to tell that it was Xiao Sizi's voice.

Everyone stared wide-eyed and opened their mouths wide, looking at this strange thing in disbelief.

Princess Chengyang was the first to exclaim: "Monster, little Si's voice was snatched away by this monster."

Xiao Sizi himself was taken aback, and quickly said: "No, I can still talk."

Everyone also reacted, and Li Tai rushed over directly, looking at the gramophone excitedly, as if seeing a treasure:
"What is this and how is it done?"

The others also looked at Chen Jingke, waiting for his answer.

This time, Chen Jingke didn't play tricks, and explained in detail: "Sound can vibrate... A paper cup is a horn. Talking loudly to it will vibrate..."

"The needle will also vibrate accordingly, and the vibration track will be engraved on the glass below..."

"When we reset everything and the bamboo needle walks along the traces carved before, it will produce the vibration of the same trajectory..."

"The vibration is transmitted to the paper cup along the bamboo needle, and it will make the same sound...I call this thing a phonograph."

Everyone was confused, but at least they understood one thing. This is not a monster but a machine that can be controlled by people.

Li Tai is the person with the deepest understanding among the crowd, the more he understands, the more interested he is in this thing, and he said obsessively:

"So that's how it is, that's how it is...the sky really doesn't create useless things. Everything is useful, but we know too little about it."

This is what Chen Jingke wanted, and just as he was about to continue talking to lure him, he realized that someone was pulling the corner of his clothes.

He looked down and saw that it was Xiao Si, and said softly, "Little Si, what's wrong?"

The little sizi whispered: "I...I want it, let Yeyeniang hear it."

Chen Jingke smiled and said, "Okay, I'll give it to you, and I'll teach you how to use it later."

Xiao Si said happily, "Thank you brother."

Princess Gao Yang was envious, and then gave Fang Yi'ai a hard look.Fang Yiai scratched her head and smiled foolishly at her.

Princess Chengyang and Chen Jingke have a good relationship and straightforward temperament, so they said directly: "Brother, I want it too."

Chen Jingke glanced at Du He and said, "I'll just have this one on hand for the time being. I'll teach brother Qingquan how to make it later, and let him build one for you."

Du He gave him a grateful look, and then said to Cheng Yang: "Princess, don't worry, I will make one and send it to you as soon as possible."

Princess Chengyang is not in the habit of grabbing things with her younger sister, so she can only say disappointedly: "Hurry up."

Du He said, "Okay, I promise you won't be kept waiting for long."

Princess Gaoyang on the other side finally couldn't bear it anymore, and kicked Fang Yiai lightly.

Fang Yiai is just naive but not stupid, she immediately understood what she meant, and said to Chen Jingke: "Really, I...I also want to make one for Gao Yang, I don't know..."

Chen Jingke smiled and said, "Okay, I'll give you a copy of the blueprint later."

Then he said to Gao Yang: "Look, now you know the benefits of having an obedient man."

Gao Yang's pretty face instantly turned red, he stomped his foot in reluctance and turned around.

"Haha..." It was rare to see her shy, and everyone burst into laughter.

Afterwards, Chen Jingke restored the glass and played it again.

It's just that it can be clearly heard that the sound quality this time is obviously not as clear as the previous one, and there are more noises.

Chen Jingke explained: "There is a piece of diamond debris under this bamboo needle. When it passes through the glass for the second time, it will deepen the trajectory and cause sound distortion."

"The more you repeat it, the more it gets distorted, until it's completely distorted."

Li Tai said: "Wouldn't it be all right to change to a needle without a diamond when it's playing?"

Chen Jingke said with a smile: "Yes, this is not to demonstrate to you, so that you can understand the characteristics of the phonograph better."

Everyone: "..."

Then the little sizi pursed her mouth, and said aggrievedly: "Brother, is the... gramophone broken?"

"Eh..." Chen Jingke slapped his forehead, forgetting about her, and quickly comforted him: "No, no, the glass can be changed at any time. Let's change to another glass and record it again, and it will work again."

The little sizi then showed his face again, and said: "That's great, I'll record one for Yeye and Niangqin when I go back to the palace."

Chen Jingke boasted: "Little Si is so good."

After coaxing his little daughter-in-law, Chen Jingke said: "Although it can be changed, it can't be changed casually."

"The closer the material and shape of the two needles and the cup are, the better. If the difference is too large, the vibrations produced will be different."

"This phonograph is still too crude, and subtle differences will affect the playback effect. It would be great if a better and more accurate phonograph could be made."

Li Tai immediately said: "Teach me the principles, and we will study together. If it really doesn't work, I will ask you to be my teacher."

Chen Jingke couldn't laugh or cry and said: "You are the elder brother of Xiaosi, what kind of teacher do you worship, if you want to learn, come to Guanli, and I will teach you."

Your Li family can ignore seniority, but I can't.

Li Tai immediately said: "Okay, I will come to you every day to learn from you, and strive to make a better phonograph."

Chen Jingke smiled and said, "Are you only studying gramophones?"

Li Tai was stunned for a moment, and asked, "Why don't you study it?"

Chen Jingke said: "The gramophone is just the fruit, and the knowledge of Gephysics is the tree that bears the fruit. Don't you want to study this tree?"

(End of this chapter)