Roland wiped the fine sweat from Anna's forehead and held her in his arms. Pen ~ fun ~ pavilion www.biquge.info

In the dim light, a seductive blush could be seen on the girl's face.

Ever since the last time he had talked to her about dreams, Roland had always felt that Anna had become more proactive in this area, and would try to learn new skills - but she had made much slower progress in this area than she had learned in books. Looking at Anna's clumsy and serious appearance, it was a completely new experience for him, and the visual enjoyment even exceeded the sensory experience, and a sense of superiority of an old driver arose.

Of course, storytime is always inevitable after the fun.

Sniffing Anna's scent, Roland recounted the new news brought by the Witch of Tachira, as well as his speculation about the battle of divine will.

"Although we have known for a long time that our place is only a corner of the continent, I did not expect that there were also civilizations completely different from ours under the mountains...... The world is full of unknowns. "Maybe one day, we, too, will be able to set foot in that distant land and see what secrets are hidden in the world across the sea." ”

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

Even if you can't get through the sea, you can still fly through it - the land that can be seen with a telescope is not too far away. When there is an internal combustion engine, there is a place for large airships.

"But are there really gods in this world? leaving relics behind that will cause us to fight each other...... Maybe it's watching us somewhere. ”

"Are you scared?" Roland couldn't help but tighten his arms and hug her closer.

"No, I have to thank it too. ”

"Why?" he was slightly stunned.

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

Roland saw a blue lake in the other's eyes—an emotion she had made no secret of.

He felt a current of heat surging in his heart.

"I'll be with you all the time. ”

"But you can't always be there for me. ”

"I—"

He was halfway through his sentence when Anna covered his mouth.

"You are the king, and the commander of the army against the devil in the future, how can you stay in Neverwinter forever. I can't take possession of you because of my own selfish desires, the soldiers who are fighting on the front lines need to see you, and the people of other cities want you to be with them. She said softly, "Roland, I'm very satisfied to hear you tell me stories like this." ”

Roland was silent for a moment, "You're right, but no matter where I am, you'll be able to hear what I'm talking about...... I can guarantee that. ”

Anna's eyes blinked, as if she understood the meaning of his words, "Don't rely on listening sigils?"

"That's right," he nodded.

If the love words between the two are also conveyed by listening to the sigils, how can people say it.

"How?"

"You'll know tomorrow," Roland rolled over and pressed Anna underneath him, then kissed her on the neck...... Then it slid all the way down the neck to the collarbone, leaving a shallow mark on the fair, tight skin, "But now, it's time for me." ”

The two joined together again, and the sweet wheezing echoed undulating for a long time.

......

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

"Good morning, Your Majesty. Lucia had come a little earlier, and she put down what she was doing and bowed to him.

"Good morning, Your Majesty, good morning, Sister Anna, Sister Nightingale!" shouted Suzu, following her sister's example, and bent down happily.

Roland smiled and waved his hand, signaling that the two of them did not need to be polite, and then walked to the workbench, pulled out a blank piece of paper, and drew a design with a pen. He intends to take advantage of the fact that the remnants of Taqira have not yet migrated to the West, to fulfill the promise he made last night - a communication tool that can communicate with Anna at any time without the need for magic.

That's the corded phone.

The principle of the telephone is simple, but it is the most basic application of electromagnetic induction: sound waves cause the metal reeds in the microphone to vibrate, causing it to form a change in magnetic flux in the magnetic field, and finally produce a large and small induced current. The earpiece, on the other hand, uses an electromagnetic coil to generate a magnetic force that fluctuates and vibrates, causing the diaphragm to vibrate and restore the current to sound.

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

When he laid out his vision and design, Anna immediately understood how this never-before-seen communication tool worked.

"I'm going to call Mizuki and Zoroa!" she said, her eyes lit up.

"Current...... Interchange voices?" Nightingale was still dazed, and she looked at Lucia as if she was looking for a sense of identity, only to find that the latter was thoughtful.

"Electricity and magnetism are born together, and magnetism is converted into force...... I see. ”

Even the little girl Ling shouted, "Sister, are you talking about the content of the second chapter of the book "Elementary Physics"?"

The nightingale was suddenly struck, and with a crushing mouth, she picked up a piece of dried fish and turned and fled into the mist.

Looking at this scene, Roland couldn't help but laugh out loud. That being said, it's not that simple to get a phone with useful features, the problem is in the signal transmission.

Electrical signals are attenuated.

That's why telephones have not been put into use on a large scale since they were developed in the early days – once the distance is too long, it is difficult for the other end to hear what is being said on the other end. It wasn't until people invented the electron tube that could amplify electrical signals that it quickly became popular.

The electrical part was not Roland's strong suit, and the books he had written at first did little about it, and now, with the help of the dream world, he found that making tubes was still quite a problem.

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

For example, increasing the size of wires and reducing route losses.

The former is very simple to implement, Anna's black fire can accurately process the required copper wire, according to the memory data, when using a wire with a diameter of four millimeters, it can maintain about 50 to 60 kilometers of non-relay communication, while the average telephone line is only 0.4 to 0.6 millimeters. This is a bit of a waste, but it can effectively avoid the hassle of signal amplifiers.

The latter can be achieved by using coaxial cable - the so-called coaxial cable is to wrap another layer of metal mesh around the wire, and the two are separated by insulating materials, so that the metal mesh becomes a Faraday cage, which minimizes the divergence of electrical signals. At the beginning of the popularization of telephones, the technology of wrapping metal layers was not yet mature, so at that time, a coil sleeve was used to reduce signal loss, that is, to put a coil sleeve wrapped in a spiral shape over the wire. However, for Roland, there is no need to follow this law anymore, with Anna's processing ability and Zoroa's special coating, it can be completely done in one step.