Release that Witch

Roland wiped the fine sweat on Anna's forehead and held her in her arms.

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

Since the last time she talked to her about dreams, Roland always felt that Anna has become more proactive in this regard, and will try to learn some new skills - just compared to the knowledge in books, her progress in this area A lot slower. Looking at Anna's clumsy and serious appearance, it is a completely new experience for him. The visual enjoyment even surpasses the sensory experience, and the superiority of an old driver comes to life.

Of course, the storytelling time after the joy is always inevitable.

Sniffing Anna's fragrance, Roland summed up the new news brought by the Takira witch and his own guess of the battle of God.

"Although we have long known that we are in a place where the mainland is only a glimpse of the mainland, we did not expect that there were so many civilizations under our mountains that were completely different from ours... This world is really full of unknowns." Anna exclaimed, "Maybe one day, We can also set foot on the distant land to see what kind of secrets are hidden in the world opposite the sea."

"There will be a day, I promise," Roland laughed back.

Even if the sea can't get through, you can fly over—the land that you can see with a telescope is never too far away. When there is an internal combustion engine, large airships will be used.

"However, is there really a **** in the world? Leaving the relics, prompting us to kill each other... maybe it is looking at us somewhere."

"Afraid?" Roland couldn't help but tighten her arm and bring her closer.

"No, I want to thank it."

"Why?" He gave a slight glimpse.

"Because it sent you to me." Anna looked up and whispered.

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

He felt that there was a surge of heat in his heart.

"I will stay with you all the time."

"But you can't always stay with me."

"I--"

When he had just said half of it, he was stunned by Anna.

"You are the king, and the commander of the future against the devil army. How can you stay in the winter city? I can't occupy all of you because of my own desires. The soldiers who fight on the front line need to see you, other cities. The people also hope that you can be with them," she said softly. "Roland, I can tell you stories like this, I am very satisfied."

Roland was silent for a moment. "You are right, but no matter where I am, you can hear the story I said... I can guarantee this."

Anna’s eyes groaned, as if he had heard what he said, “Don’t rely on listening?”

"Yes," he nodded.

If the love between the two people is to be conveyed through listening and listening, then how can people say it?

"What do you want to do?"

"Tomorrow, you will know," Roland rolled over and pressed Anna under her body, then kissed her neck... and then slipped from the neck to the collarbone, leaving a shallow mark on the white skin. "But Now, it’s time for me to change."

The two men joined together again, and the sweet gasps undulating and resounding, and they have not dispersed for a long time.

......

After breakfast the next day, Roland rejoices with Anna and walks into the backyard of Beipo Mountain.

"Good morning, sire." Lucia still had to come earlier, she put down the work at hand and bowed to him.

"Good morning, King's Majesty! Good morning, Anna sister! Night sister!" Bell also learned the appearance of her sister, and bent down happily.

Roland smiled and waved his hand, indicating that the two did not have to pay more, then went to the workbench, pulled out a piece of white paper, and drawn the design drawing. He intends to complete the promise made last night, along with the time when the remnants of the Takula have not yet moved to the West, a contact tool that can communicate with Anna at any time without the need for magic.

That is a wired phone.

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

In other words, it is not fundamentally different from generators and motors, except that the latter turns the vibration into a rotation and the power is much greater.

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

"I am going to call Mystery Moon and Soroya!" She put her eyes in the light.

"The current... is interchangeable with the sound?" After the nightingale was heard, she was still amazed. She looked at Lucia as if she wanted to find her identity, but found that the latter was thinking.

"Electricity and magnetism are born, and magnetic is transformed into force. It turns out."

Even the little girl’s bell yelled, “Sister, are you talking about the second chapter of the book, Elementary Physics?”

The nightingale was suddenly hit, and a heart was picked up and turned into a fog.

Looking at this scene, Roland couldn't help but laugh. Having said that, the phone that wants to get the functional features is not that simple, the problem is in signal transmission.

The electrical signal is attenuated.

This is also the reason why the phone was not developed on a large scale after it was developed early. Once the distance is too long, it is difficult for the other end to hear what is being said. It was not until the invention of a tube that could amplify electrical signals that it quickly became popular.

Regarding the electrical part is not Roland's strengths, the books he wrote at the beginning did not basically get involved in this aspect. Now, even with the help of the dream world, he found that making electronic tubes is still quite a troublesome thing.

Since you don't plan to amplify the signal, you only start by reducing the attenuation.

For example, increase wire size and reduce route loss.

The former is very simple to implement. Anna's black fire can accurately process the required copper wire. According to the memory data, the four-meter-diameter wire can maintain about five or sixty kilometers of non-relay communication, while the general telephone The line is only 0.4 to 0.6 mm. Although it is a waste of this, it can effectively avoid the trouble of the signal amplifier.

The latter can use coaxial cable to achieve the purpose - the so-called coaxial cable, is to wrap a metal mesh around the wire, the two are separated by insulating material, so that the metal mesh becomes a Faraday cage, the electrical signal The divergence is minimized. At the beginning of the popularization of the telephone, the technology of wrapping the metal layer was not mature, so the loading coil was used at that time, that is, a spirally wound coil sleeve was placed outside the wire to reduce signal loss. However, for Roland, naturally there is no need to follow this rule. With Anna's processing ability and Soroya's special coating, it is completely possible to make it one step.