After breakfast consisting mainly of freshly baked bread, Jin and Goh set out for their respective destinations as planned.
Jin and Goh decided to investigate the filter attached to the well in order to make a magical tool to extract minerals from the water.
They asked us to analyze the filter of the well in front of the village chief's house. Of course, with a word of warning.
"The filter. ...... I see."
"...... Jin-sama, what kind of structure is it?"
"It seems to be trying to filter out minerals with very fine fibers, but it's not enough."
Some scaling around the filter suggests that it's not a total waste, but a of the filtered water shows that it still contains a significant amount of minerals.
"In the first place, since we are trying to remove dissolved elements from the water, simply filtering the water is not enough, is it?"
"Yes, that's right."
"Okay, what would Goh do?"
I thought about it for a while last night, but I didn't come up with a good idea. But what about now, after a good night's sleep?
"I have an idea for a big device," he said.
"Oh, that's all right. What kind of structure?
"Yes. Well, there is a method called that can be used to remove dissolved substances from water. That's why ......"
It was similar to the water purifier that Jin and Reinhardt once built for Marquis Dominique de Firenziano, lord of the province of Xaus, in the kingdom of Elias.
Since Goh was not supposed to know about it, Jin was happy to know that he had come up with the idea on his own.
But...
"The idea is good. It would be of great use if it could turn seawater into fresh water. But it would cost too much to use it in this village.
It had its drawbacks.
"Yes, it is. ...... cost was also an issue last night."
Goh was happy to hear the praise, but he had mixed feelings about the fact that it was still far from being put to practical use.
"I was wondering yesterday, too, what to do with the separated minerals."
"Yes, I guess so. But after a night's sleep, I've come up with an idea that looks a little better.
"What! You are indeed a gin master! How does it work?
"That's ......."
Jin thought of a structure in which a net is stretched over the bottom of the container and the separated minerals are trapped under the net.
"Wow! That seems to work well."
Goh praised him with open arms, but Jin denied it with a sullen look on his face.
"No, it's not enough.
"Why is that?"
Goh's negative words make him ask a question reflexively.
Jin began his explanation in the form of a question to make Goh think.
First of all, how do you separate them?
"Isn't that the kind of magic circle you use?"
"Yes. In that case, where would you carve the magic circle?
At the bottom of the container, right?
"Yes, that would be the case. But perhaps that would only dilute the mineral concentration of the water at the bottom, which would be difficult for the water in the container.
"Wouldn't it circulate?"
"It would be difficult. The water with the minerals removed would certainly be a little lighter, but I don't think it would be enough to allow for natural convection."
"So that's what you're saying. ......"
Gough ponders this too.
"We can't ask them to shake it or stir it up, can we?"
"If there's no natural convection, I guess we'll have to make it artificial. ......
"Oh, that's it! Jin-sama is amazing after all."
Jin came up with the idea of carving a magic circle that would stir up the water as well as a magic circle that would separate the minerals.
"Well, I guess that would accomplish the goal," he said.
Are you still dissatisfied?
"Yes. ....... What if the vat is always swirling?"
It's ...... a little unsettling, a little creepy.
"Wouldn't it?"
"Well, how about adding a timer or something to stir it up every now and then?"
"That would be the next best thing. ......"
Jin again pondered, "But it's not the best way," he said.
* * * *
Now, Saki and Rubina.
They first headed to the east of the village.
This was the border with the former Leonard Kingdom, and at the same time a mountain range separating the two countries.
"...... limestone. This area used to be the bottom of the sea.
"Oh, I remember that limestone was formed from the carcasses of prehistoric creatures, wasn't it?
"Yes, that's right. That's called biogenesis. There are also those formed by chemical precipitation. The ones here seem to be biogenic.
How do you know?
Because it contains fossils. See?
"Oh, ......."
Saki pointed to a limestone rock with a pale granular pattern.
It's Fusilina limestone. <
Fusulina, also called spindle worms, are single-celled protozoa that live in warm seas.
Limestone is the result of the accumulation of dead corals and spindle worms, which indicates that its origin was the bottom of the sea long ago.
In Japan, limestone is found in the Chichibu Paleozoic Formation, and the Chichibu area of Saitama Prefecture is one of the largest producers of limestone in Japan.
And that mountain is probably made of chert.
Chert?
Yes. It's a hard, dense rock made of silicon dioxide, like quartz and quartz.
How can you tell?
Rubina wondered how she could tell just by looking at it from a distance.
"Kuhu, that's how."
Saki picked up a stone that had fallen at her feet.
"Because the debris is coming down to the foot of the mountain.
"Oh, I see. ......"
Ryogamiyama, which rises in the western part of the Chichibu region.
The mountain body, which is also likened to the Gate of Heavenly Rock, is said to be made of huge chert, measuring about 8 kilometers from east to west and 2 to 3 kilometers in width.
Rubina was awakened to the fascination of seeing things she had not seen before.
"It's interesting, isn't it, geology?
"Is it?"
Saki seemed to be pleased to hear that from Rubina.
The two continued to examine the rocks and stones around their feet. .......