Admitting that he could make a waterwheel, but not really knowing ...... how to transmit its rotation to the millstone, Jin decided to change his mind.

"Are there any millstones left?"

"Yes. It's stone, so even if the water mill was destroyed, the millstone would be fine."

Helga replies.

"Good, that's good. So where is the millstone?

"For now, it's in the corner of the square.

There are four millstones in use: two are turned by a waterwheel and two are turned by hand.

Let's go there.

"This way."

Helga led Jin to the square.

The square is located in the south of the village and serves as a marketplace when vendors come and as a collection point during the harvest.

In one corner of the square, there were four stone mills stacked on top of each other.

"Huh?　...... Oh, these two have been roasted over the fire."

The colors were completely different. The one that seemed to have been roasted by fire was literally dark brown.

Two of the hand millstones were burnt.

The millstones for the water mill were located near the river, so it seems that they were not damaged by the fire.

"Reiko, take me down."

"Yes, Father."

Even though the millstones were hand-cranked, they were 30 centimeters in diameter and weighed more than 30 kilograms in total.

Reiko easily carried two of them and brought them in front of Jin.

"Wow, that's amazing!"

"That's amazing. ......"

Reiko carries two 30 kg millstones, each with one hand.

The millstones here have a structure of short cylindrical members stacked one on top of the other.

Reiko is holding the lower part of the millstones because the upper part is divided into upper and lower parts when she holds the upper part, and the way she holds the millstones is like pinching the lower corner of the millstone with her fingertips.

The villagers who passed by also rolled their eyes.

The inside is not burnt.

Since the surface of the grinding seems to be fine, Jin scrapes off a thin layer of the surface of the millstone with .

"Wow, it's beautiful now."

"That's amazing. ......"

The difference between Katya and Helga's reaction was probably due to the total time they spent watching Jin's work.

Anyway, although the millstone became about two millimeters smaller, it regained its original appearance in about 30 seconds.

"Can we work a little with these two units?"

"Yes, we can. Thank you, Mr. Jin.

Helga is pleased,

"I'd like to have a grinder's hut.

Katya is calm.

The wheat has to be ground indoors or the wind will blow the flour around.

We also need dust masks.

Jin thinks for a moment that he has been in such a dusty and powdery environment recently.

"As expected, we don't have enough materials to build a hut.

Since this is not the island of Hourai, we cannot just go out and cut down some trees.

Fortunately, there is still more than a month before the wheat harvest. We should be ready during that time.

>, Jin writes the third note in his mind.

The four millstones are to be stored in the livestock barn under construction, as it is not advisable to leave them out in the rain.

It is empty because the livestock themselves have not yet arrived.

Jin writes and the fourth item in his mental note.

* * * *

Jin and the others then head to the east side of the village.

"This way is the river and the washing place, right?"

A reservoir had been built with water drawn from the Nosina River, and dirty laundry was done there.

"We used to use the water from the well and dump it all over the place," Cachair says.

Kachair says.

"If we think about the environment, we have to dispose of sewage properly.

"Right."

The reservoirs we came to were built under the guidance of <>, and they were quite good.

There is one pond upstream, where they have started to raise trout.

The next level had a washing area, and two sedimentation ponds were built downstream of the washing area.

"Will the settling ponds be treated in any way?"

Jin asked Helga about the question.

"Yes. They haven't done anything yet, but before the summer, they're going to install a purification system.　She said they're going to install a magical tool for purification before summer."

"I guess that's good."

Jin was relieved that this did not seem to be a problem.

"Did he say anything about what to do with the mud that accumulates in the settling pond?"

Jin asked one more question that had been bothering him.

"Well, I heard that the water should be drained before winter and the mud should be mixed with fallen leaves and used in the field.

"Oh, I see."

Jin agreed that the purified mud would have a lot of organic matter in it, so mixing it with humus might make a good soil .......

"But I think it's too acidic."

"Oh, I think he said that it would be good to mix eggshells and crushed bones from the meal."

"Would that be okay?"

Bone meal is probably calcium phosphate, which is slightly alkaline, right?　Jin thought.

"It would be better to mix in some grass and wood ash if possible."

The grass and wood ashes contain a lot of potassium and are definitely highly alkaline.

In the case of humus and bone meal, I felt that the amount of nitrogen and phosphorus would be too high and potassium would be insufficient.

Incidentally, nitrogen, phosphoric acid, and potassium are called the three elements of fertilizer.

"Can I use ashes from the hearth?"

"Yes, I think so."

Since the only fuel used in this village is firewood, the ashes are , so there is no problem in using them.

Here, Jin made a mental note of the fifth item, .

* * * * * * * * * *

From there, Jin and the others walked along the Nosina River upstream, that is, to the north of the village.

"The riverbed doesn't seem to have changed much.

Jin and the others walk around the north side of the village, looking at the riverbank where they searched for the rough whetstone before.

"Were the fish all right?"

"Yes, that's the thing. Most of the animals have escaped, so we've been eating only fish for a while.

Helga said.

But fortunately there was more fish than we could take up.

"Maybe fish farming is very suitable for us.

Jin made a note in his mind to < as well.