"Senior Barry. Brandy looked back and shouted.

"I'm here, Frandy. Barry hurriedly took two steps forward.

"Candace's amplifier is very important, and it's very versatile, you have some people to help her test the material of this sound membrane, three days, how about three days? I hope to see the finished product in three days. ”

"No problem, just leave it to me. Senior Barry agreed.

It's just a matter of testing materials, and it's not a problem, just find a few more people, find more materials, and try them one by one.

You don't need to test this sound film for many days at once, like an electric lamp, you just need to change it to listen to the sound, and you can change countless materials in a day.

"Okay, then that's it, I'll come back in three days, come on. Then he turned to Tom Jerry and Gustav and Katrina. "Are you here or going back with me?"

"Is this going back? I want to stay here a little longer. I'd like to work on this megaphone with Candace. "Katrina didn't want to go too much, she didn't want to go, and of course Gustav was going to stay with her.

Jerry too, since the last time he taught the researchers here the construction of magic generators, electric lights, and telephones, he hasn't been here for several days, and he doesn't want to go back after a trip.

"Alright then, send me a message when you want to go back, I'm going back first. With that, Flandi waved open the portal and returned to his magic tower.

The reason why he wanted to come back was mainly because Flandi suddenly had an idea when he saw this megaphone.

The input device for sound is there, it's a microphone, the output device for sound is there, it's a speaker, these two things are there, as long as you add a storage device, isn't it a gramophone?

In the previous life, Edison in 1877 developed the gramophone after four days and four nights of hard fighting, and with the resources that Flandi now has at his disposal, it is definitely not worse than Edison's voice at that time, on the contrary, it is much stronger.

Now he is the one who stands on the shoulders of giants, and he has memories of his previous life, especially when he was bored in his previous life, he swiped the Internet, and he knows a lot of all kinds of miscellaneous things.

The earliest phonograph was a large metal cylinder, fixed horizontally on a bracket, with a pattern carved on the surface, attached to a small crank. Next to the metal barrel is a thick metal tube.

There is a needle in the center of the bottom membrane, facing the groove of the metal cylinder. The metal cylinder underneath the tin foil is grooved, so as the sound undulates, the stylus engraving grooves in different shades of the foil. When the stylus vibrates repeatedly along the ripples, the original sound is produced.

However, this phonograph was so primitive that it would be scrapped after a few uses, almost disposable, so Brandie was going to make a second-generation phonograph made by Mr. Edison in 1887.

The second generation of phonographs used disc-shaped discs instead of metal cylinders, and wax paper instead of tin foil, because wax paper can be reused, it is much more practical than tin foil.

At first, the second generation of phonographs was powered by the announcement, but Flendie decided to skip this step and go straight to the small magic engine, which was very luxurious, but also omitted the step of the announcement.

Later, the electric engine can be used to replace the magic engine, after all, the electric engine is not cheaper than the magic engine, but some common materials.

He only had to put forward a theory and then make a physical object, as for the wax paper that stored the sound, it must need a better medium, and as for what medium was needed, it was up to the Imperial Academy of Sciences to test them one by one.

It only took Flemdy half a day in the laboratory on the seventh floor to draw the drawings of the gramophone, in fact, the original gramophone was not complicated, but it needed to be made a little more delicately.

At noon, Tom and the other four sent a signal to Frandy, who picked them up.

"Huh, Flandy, what are you working on?" asked Katrina, seeing that Flandy had already drawn several drawings.

"A device that can retain sound can be directly called a gramophone. Flandi was putting the finishing touches on the drawing, and he didn't even lift his head, just a few simple explanations.

Several of them were startled, "What? Keep the voice?" asked Jerry in surprise.

"Yes, record the sound and play it back when you want to listen to it, so you can call it a tape recorder. ”

Gustav took the drawings in his hand and looked at them carefully, as if he had an understanding.

"That's how it works, Flandy, are you sure you'll be able to reproduce the engraved sounds if you do this?"

Brandy smiled and said, "I'll know if I can restore it or not, my drawings will be finished soon, and we'll start manufacturing in the afternoon." ”

"That's it, it's that simple?"

"It's just a simple drawing, and it still needs to be a little more detailed when making it, and it's not so easy to do. ”

"So what are you waiting for, let's get started!" Jerry said excitedly.

All four of them are very enthusiastic about experimentation, especially the experiment of creating a new device, which is not something that ordinary people can experience.

"I'll have lunch in a moment, and I'll talk about it after lunch, I'm still one last bit here. Don't bother me yet, wait for me in the restaurant. ”

"Okay!" the four agreed, and they knew that it was best not to be disturbed while Flandy was drawing drawings, but it was just lunch time, and they could still wait.

So, after lunch, Frandy and a few assistants got busy.

The phonograph didn't need a lot of power, and it would be a waste to have a magic engine to provide it, so Flandi simply put together the magic generator while drawing the drawings.

In this way, the magic engine can not only drive the rotation of the disc, but also drive the power generation of the magic generator, so although the gramophone will be larger, it saves a lot of trouble.

Microphones, speakers, and the like don't need any strong current, so even if they are all put together, they still don't need much power from the magic engine.

As long as a fire-based magic essentia ampoule is used, it will not be a problem to drive it to continuous operation for hundreds of years.

This gave Flandi another idea, in his previous life, until Frand's death, he did not develop a large-capacity battery, and in this magical world, it is completely possible to use the magic engine as a battery.

With the popularity of civilian schools, there will be more and more magicians, and the magic seeds of the fire system will be easier and easier to obtain, which has solved a big problem.

Another problem left is the magic crystal, even if it is a low-level magic crystal, it is not something that ordinary people can get, the production is extremely limited, and now it can only be used by magicians, and even after the number of magicians has increased in a few years or more, there may be an embarrassment that it is not enough.

However, Frady believes that sooner or later people will find a replacement for the Enchanted Crystal, as long as they need it. I don't know how Vice Dean Gavin is doing with that fire crystal, but there is no news until now.

......

Three days later, Flandi returned to the Imperial Academy of Sciences.

However, when they came this time, Tom and Jerry came with a wooden box, and in this wooden box was the shell of the magic gramophone that had already been made.

This phonograph has reserved several ports for connecting recording equipment and playback equipment, and if you don't take it apart, you can't see the structure inside.

It was still Senior Barry who accompanied Frandy to Lab No. 3.

As he walked, Senior Barry said to Frandi: "Frandi, in the past three days, we have tested more than 5,000 kinds of materials, what do you guess is the best material in the end?"

Where could Flandy guess, the odds of such a variety of materials being able to guess were too small.

However, Senior Barry just talked casually, of course he knew that Flandi couldn't guess, and he didn't wait for Flandy to speak, so he continued: "It's paper! We debugged a kind of lacquer, applied this paint to the paper, and when it dried, it can perfectly reproduce the sound of holding the microphone!"

"Paper?" said Flandy.

In the previous life, the materials used to make speakers were paper cones, and there were several types of rubbing paper cones, paper-based wool basins, and pressed basins.

The paper cone has the advantages of natural timbre, cheap, good rigidity, light material and high sensitivity, even in some high-end HIFI systems, the use of paper cone abounds, because the sound output is very average, and the reduction is good.

However, paper concites also have disadvantages, that is, poor moisture resistance, and difficult to control consistency during manufacturing, but these can be overcome. Now is not the time to make speakers on a large scale, and when the time comes, there will be better options.

"Yes, it's paper, who would have thought that the most ordinary paper could sound so good. The Brazilian senior was a little embarrassed.

"Senior Barry, everything has a purpose, but don't think that paper is normal and don't pay attention to it. ”

"I know, I know, just to sigh, by the way, Tom, Jerry, what are you moving? It looks weirdly heavy. ”

Tom and Jerry looked at each other, and then Jerry smiled: "Senior Barry, this is a good thing that Flandi has newly researched, I won't tell you what it does now, it will definitely surprise you later!"

"Oh, what's good again?" said Barry's eyes lit up, he knew that every time Flandi researched a new device, it would be unexpected, so his curiosity grew.

However, he is not a teenager of a few years old, and this patience is still there, and since Jerry said that he will surprise himself for a while, he is not too anxious.