Roland wiped the sweat off Anna's forehead and held her in his arms.
In the dim light, he could see the alluring blush on the girl's face.
Since the last time they talked about the dream, Roland felt that Anna had become more proactive in this aspect. She would also work hard to learn some new skills, but compared to the knowledge in books, her progress in this area was much slower. Looking at Anna's clumsy and serious expression was a completely new experience for him. The visual enjoyment even surpassed the sensory experience, and a sense of superiority welled up in him.
Of course, after the pleasure, there was always a time to tell stories.
Sniffing Anna's fragrance, Roland told her the new news brought by the Taquila witches, as well as his speculation about the Battle of Divine Will.
"Although I knew that we were only in a corner of the continent, I didn't expect that there was a civilization that was 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 faraway land and see what kind of secrets are hidden in the world across the sea."
"There will definitely be such a day, I promise," Roland replied with a smile.
Even if they couldn't travel by sea, they could still fly over and use binoculars to see the land, so it wouldn't be too far. Once they had the internal combustion engine, large airships would have a place to use.
"But, is there really a God in this world? Leaving behind a relic that urges us to kill each other... Maybe it's watching us from somewhere. "
"Are you afraid?" Roland could not help but tighten his arms and pull her closer.
"No, I have to thank it."
"Why?" He was slightly stunned.
"Because it sent you to me," Anna raised her head and said softly.
Roland saw the rippling blue light in her eyes. It was her undisguised feelings.
He felt a surge of warmth in his heart.
"I will always be with you."
"But you can't always be by my side."
"I..."
Before he could finish his sentence, Anna covered his mouth.
"You're the king and the future commander of the Demon Army. How can you stay in Neverwinter all the time? I can't occupy all of you for my own selfish desires. The soldiers fighting on the frontlines need to see your figure, and the people of other cities also hope that you can be with them. " She said softly, "Roland, I'm already very satisfied to be able to listen to your stories like this."
Roland was silent for a moment. "You're right, but no matter where I am in the future, you'll be able to hear my stories … I can guarantee that."
Anna blinked as if she understood what he meant. "Not relying on the Sigil of Listening?"
"That's right," he nodded.
If the words of love between two people had to be conveyed through the Sigil of Listening, then how could they be spoken?
"How do I do it?"
"You'll know tomorrow." Roland turned over and pressed Anna under his body, then kissed her neck... then slid down from her neck to her collarbone, leaving a shallow mark on her fair and tight skin. "But now, it's my turn."
The two of them kissed again, and the sound of their sweet breaths echoed for a long time.
...
After breakfast the next day, Roland walked into the backyard of North Slope Mountain with Anna in high spirits.
"Good morning, Your Majesty." Lucia, who had come earlier, put down her work and bowed to him.
"Good morning, Your Majesty! Good morning, Sister Anna! Sister Nightingale! "Bell also imitated her sister, bowing cheerfully and shouting.
Roland smiled and waved his hand, indicating that they did not need to be so polite. He then walked to the workbench, took out a piece of white paper, and started drawing a design. He intended to take advantage of the time when the Taquila survivors had not migrated to the Western Region to fulfill the promise he made last night. A communication tool that did not require magic power to communicate with Anna at any time.
That was the wired phone.
The principle of the telephone was very simple, but it was the most basic application of the electromagnetic induction phenomenon: sound waves caused the metal reed in the microphone to vibrate, causing it to change the magnetic flux in the magnetic field, and finally produced an induced current that fluctuated between large and small. The receiver, on the other hand, used the electromagnetic coil to produce a magnetic force that fluctuated between large and small, causing the diaphragm to vibrate and restore the current to sound.
In other words, it was essentially the same as an electric motor, except that the latter turned vibration into rotation, and the power was much greater.
When he explained his idea and design plan, Anna immediately understood how this unprecedented communication tool worked.
"I'll call Mystery Moon and Soroya over!" Her eyes lit up.
"Electric current... and sound exchange?" Nightingale was still confused after hearing this. She looked at Lucia as if she was looking for a sense of identity, but found that Lucia was lost in thought.
"Electricity and magnetism coexist, and magnetism is converted into force... I see."
Even the little girl Bell exclaimed, "Sister, are you talking about the second chapter of Elementary Physics?"
Nightingale was immediately shocked. She held a piece of dried fish in her mouth, turned around, and disappeared into the Mist.
Looking at this scene, Roland could not help but laugh. Having said that, it was not so easy to make a practical telephone. The problem lay in the signal transmission.
Electric signals would be attenuated.
This was why the telephone was not put into use on a large scale after it was developed in the early years. Once the distance was too long, it was difficult for the other side to hear what was said. It was not until people discovered the vacuum tube that could amplify electric signals that it quickly became popular.
Electricity was not Roland's strong point. The books he wrote at the beginning basically did not touch on this aspect. Now, even with the help of the Dream World, it was still quite troublesome for him to make the vacuum tube.
Since he did not intend to amplify the signal, he could only start by reducing the attenuation.
For example, increasing the size of the wire and reducing the route loss.
The former was very easy to achieve. Anna's Blackfire could precisely process the required copper wire. According to the information in her memory, using a wire with a diameter of four millimeters could maintain a non-repeater communication for about 50 to 60 kilometers, while the general telephone wire was only 0.4 to 0.6 millimeters. Although it was somewhat wasteful to do so, it could effectively avoid the trouble of signal amplification.
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