A few days after the international students' visit.

With Sakura Border Territory welcoming talent for the first time, a political event for international students also came to a close.

Ladies and gentlemen, it's time to wait.

The biggest reason they came all the way to the end of the border was the start of a full-scale inspection of our laboratory, which is proud of its territorial reform chamber.

The residences of the inmates, which were formerly only digging huts, have become splendid brick buildings by repeatedly building, remodeling, and experimenting.

It may be said that the original purpose of living in an institution that is too splendid for criminals to pay for their sins has been forgotten.

A variety of experiments have been carried out in buildings as splendid as those owned by the lord's family.

Development of plain new drugs, development of plain alloys, improvement of plain plane models, development of plain power engines, development of plain batteries, development of plain bulbs, development of plain balloons, etc.

Sometimes it explodes and makes noise, but what we do is plain.

If I could make a finished product, I could do something flashy. Technological improvement is basically a repetition of plain things.

This time, we will show the results of the relatively flashy students.

I'm going to learn from the inventor and give him a demonstration.

The first is a light bulb.

Light bulbs are easy to follow. Prepare a little acidic liquid and two metal plates. If a metal plate is attached to an acidic liquid, it becomes a battery or battery. Therefore, the conductor drawn from the plate is applied to the light bulb.

The light bulb then glows pepperly.

It's really easy. Acid liquids can be used simply by squeezing citrus fruits.

The difficulty is to provide a light bulb.

In particular, it is difficult for bulbs to sustain this luminescence. A minute or two of glow is too weak as a light in life.

The bulb emits light in a portion called a filament that receives an electrical current.

It seems that the heat that the filaments get when they emit light exceeds 2,000 degrees. If it emits light normally in the atmosphere, it will naturally ignite. It's filled with oxygen and hydrogen. We are studying the three elements of combustion.

Even in the ignited state, it can be said that the light is out, but it is not different from the candle and it does not last longer than the candle. Filaments are usually extremely fine fibers, so they are short-lived as combustible materials. In that case, it would be more convenient to have a candlestick pointing at the candlestick.

So, what should I do?

Former researchers and inventors were troubled. Someone of them came up with it.

You just need to lose the combustible material.

Specifically, the filament should be wrapped in a transparent material to vent the air inside. There is no fire without oxygen or hydrogen. I mean, it doesn't burn.

That's how we built the vacuum bulb.

In this case, no matter how hot the filament gets, it won't burn. Yes, it doesn't burn.

Instead, it evaporates beyond the boiling point of the filament material.

The more the filaments evaporate, the thinner they become, and eventually they are cut. Since the electricity does not flow when it is cut off, the light emission stops. This is why it is said that "the light bulb has broken".

There are two measures. Make filaments highly heat-resistant. Prevent evaporation of filaments. Either of these.

For the former, suitable materials are known to the extent available. The bamboo and bamboo plants that are currently available are excellent.

Yeah, I picked one shot from a lifetime memory. I can expect at least the practical stage to last. I admire that there are more suitable metals in werewolf metals around tungsten, but the refining technology has not kept up, so the details are unknown.

I know how to do the second measure. The environment inside the bulb can be devised to suppress evaporation by taking away the heat of the filament.

This effect cannot be expected because heat is difficult to move in a vacuum. Of course, if you put oxygen and hydrogen in, you'll just have to go back to the beginning. Substances that do not ignite and that can take away the heat of the filaments are desirable.

This seems to be the easiest to obtain, including nitrogen. It is easy to obtain because it is irritable in the atmosphere. Grab it by hand and you'll get plenty of nitrogen impurities. The disadvantage in this case is that it is ineffective because of impurities.

Highly pure nitrogen is not available. I wish I had the technology to make liquid nitrogen as cold as possible, but it seems impossible for the time being.

We might be able to make it by turning the steam engine fully to create high pressure - in fact, we could make as much ice - and the cost would be terrible.

In the first place, maintaining the vacuum used for vacuum bulbs is even sweet. Even in a low-temperature environment, it is visible that nitrogen can be removed from it and injected into the bulb itself.

That is why there is still room for improvement in the current light bulb, but it has reached the practical stage.

It is a light source that has no fire, no soot, and at first glance it is not clear why there is light there.

It's not strange for a first-time visitor to look like magic. Actually, it's very stiff.

"The fire is burning inside... No, it's not fire... it's not, right?

"Huh? What is this? Huh?

"What... inside this... what?

I admire it, I'm confused by the bite.

The most fantastic reaction among the people who saw the light bulb was whether they caught the fairy or not.

A fantasy unfavourable to mankind, with no monsters and no fairies.

Incidentally, batteries and batteries that supply electricity are actually more important inventions than bulbs.

What I am using is a battery made of lead and sulfuric acid. The output is still weak, but if the electric motor is adjusted in series, it can be used for stable output machine tools, lathes, etc.

It mainly uses water wheels for hydroelectric power generation.

... instead of generating electricity, turning the machine tool directly in a water wheel has been more efficient so far.

Sulfuric acid production became possible thanks to the availability of sulfur, and development around this area proceeded at once.

Sulfuric acid, very useful.

Although it is a prehistoric listening knowledge, it seems that sulfuric acid will be needed in various processes in the industrialization era, and that sulfur consumption will be one guide for measuring the industrial power of the country.

It seems that sulfuric acid can also be removed during the oil refining process, so we can understand how fossil fuels are important to the development of civilization. In other words, the world is hopeless.

When I was sucking my fingers in love with fossil fuels, the international students who had been explained by the director of the laboratory, Miss Reina, were already full of faces.

I am troubled by your satisfaction here.

There is a demonstration that has a little more impact.

If you can manipulate the electricity there in a user-friendly way, the possible range will be spread all at once. For example, is it a substance that can be obtained by electrolysis?

This demonstration will take place outside the lab as it is dangerous to do indoors.

When I took the international students out, the lab staff, headed by Hermes, was running around to prepare for my accident.

"Hermes, are you ready?"

"I just installed the battery on the propeller. Hydrogen has been filled. Next, make sure the collar is securely tied..."

When Hermes says it, the staff who was playing with the dog-sized object will say it's confirmed.

"Ready, Master Planner."

Hermes made a serious report with his lips lifted with excitement.

I've done this test over and over again, but it seems fun to do it over and over again.

I also look back at the international student with a smile on my face when I was caught by Hermes.

Well, let's have a look. This is the most proud prototype in our lab right now. Chief Reina, thank you very much. "

Laboratories have what is often called a rice grain-shaped object. At the bottom of the rice grain is a little square fillet.

When asked what this is, the people of the previous life would have answered:

An airship.

"From now on, we will conduct a test flight of a prototype airship. Test, start."

In accordance with Miss Reina's daunting orders, the crew with the airship is playing with the lower part of the rice grain.

Connecting the battery to the motor conductor. This motor is connected to the propeller and is not as powerful as it is powerful, but it catches the wind and generates propulsion.

With its propulsion, this airship can fly.

Because even floating is possible on its own.

The crew let go of the hand holding the airship.

Airships float in the wind, like ships floating in the sea. The propeller is the one that blows the atmosphere instead of the blade.

Start slowly and gradually faster. Sometimes it was a splendid flight to cross the sky without being relied on by the wind.

Laboratories who have already seen it several times are laughing at the airship with a full smile.

For the first time, the international students shouted in surprise and looked at them with their eyes on a plate.

All of that is a tribute to the boy who was fascinated by the aircraft.

The praiseworthy boy still whispered greedily.

"Hey, if the last experiment had worked, I might have shown you the plane instead of the airship."

However, from the way your cheeks are tightening like spring snow, you can see the full mood of the illuminated boy.

Besides, Hermes speaks much faster than usual.

"Oh, I know, I know. That international student is an important customer. If the prototype engine explodes, it won't work."

Well, that's true.

"In that regard, the airship is certainly good. That size will surprise you even if you light it."

I smile and slap my back at Hermes, who told me to make more small experimental engines.

"You're building an improved engine, right? It's going to be so late."

International students are young. I hope you will take care of me for a long time to come. I still have a chance to show you.

"And look at that."

The international students began to shout alongside other staff, saying that the astonishment they had seen for the first time had begun to turn into a surprise.

Arun, who is honest in his emotional expression, is excited to forget his identity, even Miss Seele, who is involved in intelligence, and Miss Medici, who was educated by the diplomat's mother.

"I can't say anybody in there can fly anymore."

Oh, yeah.

Instead of being a lab member during the exam, Hermes looks at the sight that he created with his own hands in a mere dream hunter tone.

Ultra-telescopic eyes, which were once invisible at their feet, are certainly now focused on the people in front of them.

"We've already come that far."

"Of course."

A low-altitude airship has that much power.

Unlike tendon-powered airplanes, this prototype airship has the ability to fly in the sky with humans on board if it is as large as it is.

However, if left unattended, it will go anywhere, and since it is light, there is a risk of being exposed to a sudden wind, so it is quite pathetic to see a string called a collar attached.

That's it, it's like a balloon distributed to children in an amusement park, as I remember it from my previous life.

If you make a difference, it is a little dangerous because the contents are hydrogen.

One spark will cause a great flame. Helium may be safer, but it's difficult to produce this. In that regard, hydrogen can be obtained simply by pumping electricity into the water around it.

In the meantime, if we can get this far with the airship technology, we can get to the mysterious rendezvous point we got when we fought Trent.

Whether or not you can go with a propeller plane depends on Hermes' cancer. It's too difficult to get there on foot, but we can handle it with an airplane.

Asked if it was necessary to go there, there was no reason other than the anomaly of "I feel like I have been able to communicate with the monster".

But I have to go.

I really don't have any basis, but I think so somehow.

While I was thinking about it, it seems that the test flight of the airship is over. Miss Reina and Hermes are giving the international students an overview of the airship.

I was thinking of joining, and Mr Bergo came closer with one hand up.

"What's wrong?

"No, it's not a big deal, but I thought I'd put it in your ear."

Mr. Bergo and other early members of the inmate community are now completely treated as researchers and engineers. The results of the laboratory were recognized and the sentence was commuted.

The creation of manure compost and the operation of test farms have been followed by an increase in the number of jailed prisoners, who are in charge of supervision and more specialized fields.

"I heard from old habits....."

Mr Bergo's old habits are those who live in unpleasant neighborhoods in the city.

Fortunately, the grey zone of the slum city - or even the dark zones altogether, just because they don't have kills.

There are some bad things that are necessary because they are people who do things like guardians outside the law called slums.

I also met their parent several times. The first impression was that the Yak chef was more afraid.

Anyway, information from the shadows of this city will be brought to you via Mr. Bergo.

"Hey, it looks like there's some redundant wandering around here."

"Does that mean you're not a citizen of our country?

That's right, Bergo nods.

The people who lived behind the city decided that they were different from the recent increase in the number of refugees because they went so far as to listen to me.

"When you come here in a glimpse, you'll soon be gone. And after a while, you'll see a similar face again."

Well, that's interesting information.

Next time, I have to greet my parents.

Please tell Bergo that you would like to have a drink this time as a thank you for the information. Of course, I promised Mr. Bergo a drink.

Lord Fennex.

As if I had watched the end of a little exchange of information - no, I suppose I had watched it, Miss Salle slipped into the just right gap between the conversation and the conversation.

"Excuse me, Seele. What about the results of the Institute, which the Office for the Promotion of Territorial Reform is proud of?"

"I'm totally surprised. I've been wondering how amazing things have been in my life since I've been here... no, I've been wondering every time the angle of the sun has changed since I left Vladimir SKNA."

A little tiredness and plenty of fulfilment appeared on her face.

"It's only been a few days, ten days, but I can't write my grandfather's letter anymore."

"That's tough. At the same time, it makes you proud."

It is said that the Territorial Reform Promotion Office is amazing what its members came to do. I'm glad to be frank.

"Sir Fenex, if you don't mind, could you advise me on what to write?

With pleasure, I reply immediately.

Miss Seele gave priority to the task to be tackled by the Vicomte Sucuna, at least ostensibly in line with the Sakura Border Territory's intentions.

"Again, I would like to recommend civil engineering technology that can be used to develop the transportation network and architecture."

This is also a strong desire to boost circulation with the Sakura Border Territory, but it will also have a positive effect on the tourist destination of the County of Squana.

"I see...."

She gives a rare peek at her face, which may be called beauty, at the youthfulness and childishness that she usually hides with a gentle attitude.

Letters from destinations are a bit boring when it comes to stones and roads. That's what I said.

However, it seems that the education given by the skilled aristocracy was certain. Miss Salle shook her head and smiled, scolding the emotions that came to her mind.

"Now, let Grandpa know how comfortable it is to ride that carriage and how wonderful the paved road is."

"Yes, thank you. To be honest, the lightbulbs and airships that I showed you today, even if they were prototypes, they wouldn't be popular enough."

When I opened my cheeks to seed, she seemed completely convinced.

"I'm sorry. Especially about that flying ship, it's a shame to dream about it."

"It's a wonderful dream."

From the bottom of my heart, I answered.

"That dream will come true."