Eira, Cachea, and Groma listen attentively to the pinhole camera.

"Well, it was interesting," said Eira.

Let's try it first."

So they immediately made a pinhole camera with the materials they had on hand.

A square box with frosted glass on one side and a needle hole on the other side is made. The diameter of the hole is about 0.2 mm.

When the camera is pointed toward a bright light, the view from that side is reflected upside down on the frosted glass.

If it is difficult to see, cover the frosted glass with a hood to darken it.

If you replace the frosted glass with film, you have a film camera.

"I don't think this is taught at the . ......"

Eira says ruefully.

(Is it missing from the curriculum? ......)

This was a bit surprising to me as well.

I thought there should be a demonstration of a pinhole camera in the upper elementary school level as a basic of optics. ...... (I remember seeing it too).

(I remember seeing it too).

(I remember seeing one myself.) My teacher at that time called it a .

"So we reverse this. Instead of frosted glass, we can insert a with a magic circle drawn on it and illuminate it with a strong light from this side."

In the case of an electric light source, heat is generated at the same time, so we must be careful not to cause a fire due to the heat generated, but in the case of a magical light source, we can illuminate it in a frequency band that does not contain heat rays.

"But still, we need a very bright light source, don't we?"

It is not a lens like the one used in a camera, but a pinhole, so it is very dark.

If you use a pinhole lens with an F value (the smaller the value, the brighter the lens), you will need a very bright light source. The smaller the number, the brighter the lens) is applied to a pinhole, it might be around F200.

"What's left is the focal length?"

If you want to project the image to a distant place, you will have to make a lot of efforts.

After building the actual pinhole camera, the problems became clear.

"For now, let's think about making it effective at a distance of about 10 meters.

Jin suggests.

If we try to pursue high performance from the beginning, we may end up not being able to complete the project anytime soon.

So, Jin and his team immediately start working on the prototype of the .

* * * * * * * * *

Meanwhile, Elsa is also demonstrating the <3D human body model> to those who are engaged in the medical field.

"With ......, you can also display only the nervous and vascular systems that line the human body, like this."

This was an advantage of the 3D image that could not be easily achieved with a model.

"In addition, we can show what would happen if a person contracted a disease that we know about, like this: ......."

Elsa operates the controller. A list of diseases is then displayed.

It is displayed in a tree view, for example, head--brain--stroke, chest--pulmonary--pulmonary tuberculosis, and so on. --pulmonary tuberculosis, and so on.

If you select pulmonary tuberculosis, you can see the condition of the affected lungs.

In some cases, you can also select the stage of the disease, such as early, middle, late, or end stage.

Unfortunately, not all of them are available, but that is because there are no cases and the data are not stored.

Elsa then finished her explanation.

"That's wonderful, Miss Elsa!"

Mei Shai Joey, who was assisting her, complimented in an impressed voice.

"Thank you. I hope that ...... this magical tool will be used for the further development of medicine."

He then bowed to the audience.

The audience applauded him generously.

Now, please ask your questions.

May Shai Joey addressed the audience.

"......, Pollyanna?"

"Yes. My name is ...... Pollyanna Pendleton. ...... Is that magical tool, the <<3D human body model>>, available to any of us in the medical team?"

"Yes, it will be donated to <>. And since it is not something that should be classified and should be open to the public, it will probably be available in a few days.

Elsa replied and looked at Mei Shai Joey.

Mei Shai Joey saw the meaning of her gaze,

"Yes, as you say, Elsa-sama, I can assure you that this will be open to the public.

A murmur of "good" and "happy" spread through the room.

"Now, other questions, please. ...... yes, then Cain."

"Yes. My name is Cain Gay. ......You said that there are some diseases that are not registered there, but can they be added later?"

"Yes, you can. I can add it to ......, but not for everyone, right now it's just me, Jin, and ...... maybe a deus ex machina."

"Okay."

Next, ...... is Najas.

"Yes. ...... is Najas Khan. Do you have any cases of damage to internal organs caused by ...... external forces?"

I showed him cases of dislocations and fractures in major areas of the skeleton, but not with regard to internal organs.

"Yes, I am afraid not. Damage caused by external forces is too varied and difficult to be databased.

"...... understands. Thank you very much.

After receiving more questions like that,

"Well, this concludes the presentation. I wish you all further improvement and development. Thank you very much for your attention.

The briefing by Elsa was over.

The time was 11:50 a.m.

* * * * * * * * * * * * * *

<>, the lunch break is from noon to 1:00 PM.

Jin and the others had accordingly visited the cafeteria for lunch.

"Is Elsa at ......?"

Unfortunately, Elsa was not in the cafeteria for the public.

Unfortunately, Elsa was not in the public dining room, because May Shai Joey was leading her to the dining room for guests.

Anyway, during the meal, but after the meal at the time of tea, there was a crowd around Jin.

Of course, they were people who wanted to ask the <> for his teachings and advice.

Jin was willing to answer any meaningful questions as long as he had time - that is, during his lunch break.

How can I improve my engineering magic?

Please make me your apprentice!

and other vague questions and unfulfillable requests,

I am stuck in the development of magic tools. I'm trying to improve the efficiency of < by using a compressed format, but it doesn't work very well. What is wrong?

For specific and technical questions such as "What's wrong?

"I think that is a bad approach. Compressed format helps to increase the amount of writes to <, but not so much to increase the efficiency. If you want to try it, try multi-layering.

This was the advice he gave to the participants.

At 1:00 p.m., Jin and the others headed back to the .