At this time, Lu Qi noticed something and picked it up. It was two trumpet-shaped things with a line in the middle.

He picked it up and asked curiously, "Navis, what is this?"

Navis, who was caught in the middle and forced to chat, subconsciously stood up when she heard Lu Qi's question, and replied nervously, "Return to Your Highness, that is the microphone I invented."

"microphone?"

When Lacus heard this, she also stood up curiously.

When she came, Lu Qi handed over one of the speakers.

Lux took it, and then walked a few steps to the farthest point of the line, about seven or eight meters away.

Then she said into the horn, "Hey, can you hear me?"

Lu Qi didn't even need to raise the horn, looked at Lux at the other end and said, "Isn't this nonsense?"

So Lacus couldn't help asking blankly: "So what's the use of this microphone?"

With the distance between her and Lu Qi, she can communicate with normal speech.

Navis showed an embarrassing expression, and said embarrassedly: "So it's useless."

Lu Qi turned his head and looked at the gizmos in the room. It seemed that they were all made by Navis, and they seemed useless.

"So you have been at home for so long, and you have researched some waste products?"

He said.

Hearing this, Navis lowered her head and said weakly, "Yes."

Although it is very sad to be called a waste product this time, it has to be admitted that what Lu Qi said is true.

Lu Qi continued: "Actually, I think you just think too much."

Unexpectedly, Lu Qi would have a follow-up article, Navis raised her head, as if she was a little puzzled.

"You don't seem to have focused your attention on one thing."

Lu Qi picked up the paper on the ground and checked it. There are several types of things recorded on these papers, but the dates of these types are not far apart.

This shows that after Navis researched an object and found it was useless, she gave up decisively, and then put her mind on the next one.

Because of this, she didn't come up with a useful invention.

Hearing this, Navis bowed her head even more ashamedly.

Lu Qi looked around, and actually found some small inventions that would definitely be useful if he continued to study.

However, Navis did not persevere.

"Like this, microphone, do you know why sound can travel between two speakers?"

"Because there is a medium of communication between them."

Navis replied subconsciously.

Lu Qi continued: "Yes, the rope is the medium for sound transmission, but have you found that when it exceeds a certain distance, the sound cannot be transmitted?"

Navis nodded, the results of her several attempts were the same.

"Because, when the distance is long, the sound transmission is interfered a lot." Lu Qi played with the speaker in his hand, and then asked, "Do you know how sound is transmitted?"

Facing this question, Navis thought for a while before replying, "I think some kind of substance must be needed for the transmission of sound."

She was able to answer vaguely.

Lu Qi was a little surprised, and then added: "Yes, what is needed for sound to propagate in the air is a substance, and I will use it as a medium."

At this moment, Kashina, Lacus, and Fiona sat aside, looking at the two people who were talking, they suddenly felt that they couldn't get into it.

"medium?"

Navis was a little dazed for the first time.

Lu Qi said: "There are many kinds of media, including objects, gases, and even liquids. Have you ever tried it? Can sound travel in an environment without air?"

Navis shook her head.

"Let me tell you the answer directly. Sound cannot be transmitted in a vacuum environment. It can only be transmitted through a medium. This medium also exists in the air we breathe."

Lu Qi said, took a breath and asked again: "Do you now know why the sound cannot be transmitted beyond a certain distance?"

Navis thought for a while, and replied, "Because the influence of the medium is not enough? That is, the rope cannot carry the function of carrying sound for a longer distance."

Lacus, Kashina, Fiona: (⊙_⊙)

Completely unable to comprehend, they raised their heads and began to travel far and wide.

"Then do you know that the voice has a high and a low, and what does the high and low pass through?"

"what?"

"vibration."

As they chatted, a gleam of light gradually appeared in Navis' eyes under the big round glasses.

"You can think of sound as ripples on the water surface. During the propagation of sound, the greater the vibration amplitude, the louder it will be."

"That is to say, the reason why the microphone cannot transmit sound beyond a certain distance is also due to insufficient vibration amplitude?"

"good."

Seeing Navis's stunned expression, Lu Qi was quite satisfied, this girl has some talents.

So he said something more.

At the same time, it also answered Navis' puzzlement.

Three 10 minutes later.

"That's almost all. Speaking of which, do you understand?"

Lu Qi's speech was parched. Of course, he couldn't explain and explain class by class like in university courses.

I can only express my mastery and understanding in the simplest way.

For example, in the era of electronic technology later, I didn't talk about it at all.

Let’s go on, it’s an episode that goes into science.

At this time, the sensible Kashina poured Lu Qi a glass of water and brought it over.

Lu Qi took a sip and looked at Navis who seemed to be still processing the information.

"I understand!"

Navis suddenly raised her head, and her voice became louder unconsciously, showing an expression of sudden realization, "If it exceeds a wide range, the sound must not be able to spread, because there is not enough medium, and the sound will dissipate in the process.

Even if I wrap it in copper tubing, it won't work to minimize the sound dispersion. "

She began to deduce herself, stood up, took a book from the shelf, and flipped through pages quickly.

Makes one wonder if she even saw what was on that page.

Finally, she stopped on a page and looked at the content on it: "However, the normal method won't work, you can use this."

Lu Qi stepped forward and took a look. It was a shell-shaped body surrounded by circles.

"The shell of the triangle crab is a very strong shell, and people usually use it to make simple tools." Navis said to herself, "However, this shell can also be used as a medium for sound transmission. It can accommodate sound, It will definitely spread.

The sound travels halfway through it, it will be retained, and it will not be affected when it is transmitted again, and it can continue to propagate, and when the sound passes through the shell, the vibration amplitude will be enhanced again. "

At this time, there was no need for Lu Qi to say anything.

Navis already had the answer in her heart, and her eyes lit up completely: "This way, you don't have to worry about the problem of insufficient medium and vibration when the sound is halfway transmitted!"

Lu Qi looked at the girl in front of him who was asking and answering questions.

Can't help feeling...genius.

Navis, may be a genius.

It's a pity that I was born in the wrong place. If I was born in Piltover, I think the future will be very bright.

Known as the City of Evolution, Piltover has concentrated many outstanding inventors, and it can be said that it is at the forefront of Runeterra technology.

However, Demacia seldom interacts with Piltover, almost none.

Otherwise, Germany's industrial level can still improve.

Chapter 82 It's clearly agreed to be a mess together!

"Navis!"

Lu Qi's voice was a little heavier, and he said, "I have a task for you, and I order you to develop the microphone quickly."

Hearing this, Navis subconsciously stood up straight and replied, "Yes!"

Eh?

Immediately, she froze for a moment.

Why did you get so confused that you accepted a mission?

"I'm waiting for your good news."

Lu Qi smiled.

Microphone, good stuff.

After researching it, he will install one at home at that time. When he wakes up every day when his mouth is dry, he doesn't need to get out of bed, just call Yuerna directly.

It's not in vain for him to waste his tongue for so long!

"Your Highness, I heard that you are looking for me, and there are other things..."

Navis came back to her senses, her voice returned to normal, she seemed to have no strength.

"Ah, yes." At this moment, Lu Qi also remembered his real purpose of coming here today, "I'll tell you about the newspaper."

Not much to say this time, just a concept.

After listening, Navis sighed: "I had a similar idea before. But when I proposed it, many people laughed at me, and I didn't have the funds to prepare..."

The current Demacia basically uses transcription and lithographic methods, which are very rigid and inflexible.

Generally, official bulletins are transcribed by special people, and then posted outside for the common people to watch.

Lithographic printing, on the other hand, can basically only deal with books, because the content of books is rigid. It only needs to burn out the fixed words, then copy them with ink and paper, and then fix these papers together, and paste the leather surface prepared in advance.

The whole process is laborious and time consuming.

Don't look at Lu Qi and the others who have books to read every day. In fact, folk books are extremely expensive.

There is even a kind of occupation, which is to copy and write books for others.

Therefore, it will definitely cost money in the initial stage to make a big deal of printing.

Whether it's paper, equipment, or manpower and material resources, it's a lot of money, and the three thousand gold coins on Lu Qi's body may not be enough to spend.

That's why he recruited three of them, Lacus, Fiona, and Kashina.

Under the premise of not being sure that this thing will explode in the future, naturally no one would dare to try it lightly.

It stands to reason that Navis is the young lady of the doorman family, so she should be qualified.

In reality, however, this is not the case.

Because her mother didn't listen to the family's words, she married an ordinary craftsman without permission, which made her not very popular in the doorman family.

Even though her name has the word "menke" in it, some people regard her as an outsider.

Looking at the girl who bowed her head in front of her, Lu Qi said: "Now you don't have to worry about this problem, just do it boldly according to your ideas."

Navis raised her head, looked at Lu Qi, and said with some confidence: "But...can I do it? Why don't you go find someone else?"

In terms of talent, she doesn't seem to be the most outstanding in the Menke family.

She often makes some useless inventions, leading many people in the family to think she is the most stupid one.

I obviously have no advantages...

Lu Qi looked her up and down, and said seriously: "Because other people don't seem to be as easy to fool as you."

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