Chapter 741 The Art of Sound Transmission

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Roland wiped the fine sweat from Anna's forehead, and held her in his arms. www.しwxs520. com Lewen Novel

In the dim light, you can still see a seductive blush on the girl's face.

Since the last time I talked to her about the dream, Roland always felt that Anna had become more active in this aspect, and would work hard to learn some new skills—it was just that her progress in this aspect was slower than the knowledge in books. Much slower. Seeing Anna's clumsy and serious appearance was a completely new experience for him. The visual enjoyment even surpassed the sensory experience, and a sense of superiority of an old driver emerged spontaneously.

Of course, storytime after the fun is always inevitable.

Smelling the fragrance of Anna's hair, Roland explained in detail the new news brought by the Taquila Witch and his guess about the battle of divine will.

"Although I knew that we were only in the corner of the mainland, I didn't expect that there were civilizations completely different from ours under the mountains... This world is really full of unknowns." Anna sighed, "Maybe one day, We can also set foot on that distant land to see what kind of secrets are hidden in the world across the sea."

"There will be such a day, I promise," Roland replied with a smile.

Even if the sea is impassable, you can still fly there-the land that can be seen with a telescope is not too far away. When there is an internal combustion engine, large airships will come into play.

"However, do gods really exist in this world? They left behind relics, prompting us to fight each other... maybe it is watching us somewhere."

"Are you afraid?" Roland couldn't help tightening his arms and hugging her closer.

"No, I still have to thank it."

"Why?" He was slightly taken aback.

"Because it sent you to me." Anna raised her head and said softly.

Roland saw the blue lake light rippling in the other person's eyes - that was her undisguised emotion.

He felt a heat surge in his heart.

"I will always be with you."

"But you can't always be by my side."

"I--"

As soon as he spoke halfway, Anna covered his mouth.

"You are the king and the commander in chief against the devil army in the future. How can you stay in Neverwinter forever? I can't take all of you because of my own desires. The soldiers fighting on the front line need to see you. Other cities My people also hope that you can be with them." She said softly, "Roland, I am very satisfied to hear you tell me stories like this."

Roland was silent for a moment, "You are right, but no matter where I am in the future, you will be able to hear the stories I tell... I can guarantee this."

Anna blinked her eyes, as if she understood the meaning of his words, "Don't rely on the Sigil of Listening?"

"That's right," he nodded.

If the love words between two people should also be conveyed through the listening sigil, how can it be spoken.

"How to do it?"

"You will know tomorrow," Roland turned over and pressed Anna under him, then kissed her neck...then slid from the neck to the collarbone, leaving a light mark on the white and tight skin, "but Now, it's my turn."

The two joined together again, and the sweet panting sound echoed up and down, which lasted for a long time.

...

After breakfast the next day, Roland walked into the backyard of North Slope Mountain with Anna refreshed.

"Good morning, Your Majesty." Lucia came even earlier, she put down her work and bowed to him.

"Good morning, Your Majesty the King! Good morning, Sister Anna! Sister Nightingale!" Ling Ye followed her sister's example and shouted cheerfully.

Roland smiled and waved his hands, indicating that the two of them don't need to be polite, then walked to the workbench, took out a blank piece of paper, and drew a design drawing with a pen. He intends to take advantage of the time when the Taquila survivors have not yet migrated to the western region to fulfill the promise he made last night - a communication tool that can communicate with Anna at any time without magic power.

That is the landline phone.

The principle of the telephone is very simple, but it is the most basic application of the phenomenon of electromagnetic induction: the sound wave causes the metal reed in the microphone to vibrate, causing it to form a magnetic flux change in the magnetic field, and finally produces a large and small induced current. The earpiece, on the other hand, uses the electromagnetic coil to generate a magnetic force that is large and small, causing the diaphragm to vibrate and restore the current to sound.

In other words, there is no essential difference between it and a generator or an electric motor, except that the latter turns vibration into rotation, and the power is much greater.

When he explained his ideas and designs, Anna immediately understood how this unprecedented communication tool works.

"I'll call Mystery Moon and Soraya over!" Her eyes lit up.

"Electricity... exchanged with sound?" Nightingale was still at a loss after listening. She looked at Lucia as if she was looking for a sense of approval, but found that the latter was thinking.

"Electricity and magnetism are born together, and the magnetism is transformed into force...that's how it is."

Even the little girl Bell yelled, "Sister, are you talking about the content of the second chapter in the book "Elementary Physics"?"

Nightingale was hit immediately, and heartbroken, she picked up a piece of dried fish, turned around and fled into the mist.

Looking at this scene, Roland couldn't help laughing out loud. Having said that, it is not that simple to get a functional phone, the problem is the signal transmission.

Electrical signals are attenuated.

This is also the reason why the telephone was not put into use on a large scale after it was developed in the early stage-once the distance is too long, it is difficult for the other end to hear clearly what the other end is saying. It wasn't until people invented the electron tube that can amplify electrical signals that it quickly became popular.

The electrical part is not Roland's strong point. The books he wrote at the beginning basically didn't get involved in this aspect. Even with the help of the dream world, he found that manufacturing electronic tubes is still quite troublesome.

Since you don't intend to amplify the signal, you can only start with reducing the attenuation.

Such as increasing wire size and reducing line loss.

The former is very simple to implement. Anna’s black fire can precisely process the required copper wires. According to the memory data, using a wire with a diameter of 4 mm can maintain a non-relay communication of about 50 to 60 kilometers. The wire is only 0.4 to 0.6 mm. It's a bit wasteful to do so, but it can effectively avoid the trouble of signal amplifiers.

The latter can use coaxial cables to achieve the purpose-the so-called coaxial cable is to wrap a layer of metal mesh around the wire, and the two are separated by insulating materials, making the metal mesh a Faraday cage, which transmits electrical signals. divergence is minimized. At the beginning of the popularization of telephones, the technology of wrapping the metal layer was not yet mature, so the loading coil was used at that time, that is, a helically wound coil sleeve was placed outside the wire to reduce signal loss. But for Roland, there is no need to follow this rule anymore. With Anna's processing ability and Soraya's special coating, it can be done in one step.