< keeping an eye on their surroundings, Arnold and Chelle were able to concentrate on investigating the inside of the workshop.

"Well, there's not much here, is there?"

"Yes, Mr. Arnold."

But perhaps because the facility was abandoned, there were no materials, no parts, and only a few scraps of work.

It is clear that even the scraps were properly sorted and intended to be reused.

"I wonder if this place has been moved out after all?"

"That's a big possibility. ...... since no one seems to have died in this facility."

"I see. ......"

Nevertheless, Arnold and Chelle continue to investigate the workshop.

And it seems to have paid off,

"Mr. Arnold..."

Chelle seems to have found something.

"Yes, what is it?"

"It's a drawing of something, isn't it?"

It was a drawing engraved on a rusty brass plate. No, it must not have been rusted when it was engraved.

It seems that drawings were often stored on thin metal plates because leather paper was not large enough and did not preserve well.

Even after 700 years, the brass plate has not decayed, and we could still read the drawing on it.

"Hmmm ...... this is a parts drawing. It also looks like a scribble."

In the broadest sense, blueprints include schematic drawings, assembly drawings, parts drawings, and bills of materials.

Schematic drawings are used to explain the outline and function of a product to a third party in an easy-to-understand manner, using floor plans and functional drawings.

Assembly drawing is a drawing that explains all parts and how and where they are used.

A parts drawing is a drawing of all the individual parts.

A bill of materials provides information such as how many of all parts are needed to make a product.

Generally, you may think of a blueprint as an , but a single blueprint is not enough to make a product.

Since most machines are made up of a combination of parts, it is necessary to know what parts are needed.

And if it is an important part, or if a good engineer sees it, he may be able to know the whole machine from a single drawing. ......

"But what is this?"

"I don't know, sir."

"Hmmm, maybe Jin can figure it out?　......<>Lord, show this drawing to Jin."

Arnold called out to <, who was on the lookout, and hoped that Jin could get a good look at the drawings through his vision.

* * *

"Hmmm ...... what's this?"

<, Jin tilted his head.

Jin stared at the rusted brass plate, which was blackened and glowing greenish-blue in some places.

The explanations where they were supposed to be were hidden by the greenish-blue, making them difficult to read.

"But ...... spiral (spiral?) ...... and the disk on one side ...... could this be ......<>!　......No, it's not right for that."

Jin's sense is that it is inconceivable that he would go to the trouble of drawing a spiral groove in a drawing of a screw.

But that is the story of drawings seen in modern Japan, and it may be different in this world. ......

"Besides, the difference between the peaks and valleys is too big for a screw. ......"

I don't know the scale, so it's hard to come up with ...... but.

"Maybe it's a spiral staircase?"

However, it seemed strange that the steps were not drawn for a spiral staircase.

"...... You don't think it's a ...... pile driver, do you?"

A pile driver is a pile driver, not a drill.

Jin is mistaken on this point.

The name of what Jin has in mind is a huge drill that drills holes in the ground <.

It is designed to drill through relatively soft soil, not into bedrock.

"Is this a blueprint for a construction machine?　Without using magic?　Is that why they bothered with the drawings?"

Not knowing the circumstances of the time, I could not speculate further.

"Is there any meaning in the fact that you used a blueprint instead of a template?"

"Father, that is exactly what I think that only Mr. Arnold would understand."

* * *

"...... kyodaina drill dato oshatte massu."

Meanwhile, Arnold was also informed of Jin's decision through <.

"Drill ......?"

"Mr. Arnold, do you have any idea what's going on?"

"Yes. At the end of the ......<>, there was a shortage of good mages, and many ordinary people were involved in the construction work.

Arnold guessed that the parts were needed for non-magical construction machines.

This explanation reached Jin through <'s hearing.

Arnold's explanation reached Jin through <'s hearing.

"I see. They were researching such heavy equipment in that facility?

However, such heavy machines can be converted into weapons with a little modification.

Jin also imagined that they might have had such a plan in mind.

* * * * * * * * * *

"Are there any other documents left?"

"I don't think so. ...... Oh, wait a minute.

Chelle, who was checking the shelves in the workshop, seemed to have found something else.

"I found this."

It was a magic crystal (magi crystal) that was supposed to be used for storing information.

However, it was missing. It was probably defective, Arnold thought.

But just to be sure, he decided to check the contents by <>.

And then, he found the following

<>

"...... so far?"

As expected, not much information was recorded.

However,

"Mr. Arnold, are you saying that the <> of the <> is taking place at the <> of the <>?"

Chelle's mind was filling in the incomplete information, and assembling it into the information that was just barely necessary.

"I can't be sure, but I think it's highly probable."

"Yes, it is. Chelle, you did a great job.

Thank you.

Then, when it seemed that no new discoveries could be made by investigating the workshop any further, he decided to go to the <> that had been shown on the floor plan.

"Well, it wasn't exactly marked as a <>, was it?"

"Yes, it was. Probably ......."

"Yeah, maybe this is it."

This is the wall on the right side of the corridor from the room with the transfer magic circle.

If you look closely, you can see a narrow opening in the wall, which seems to be a door.

Do you want me to open it?

"No, Mr. Arnold, this is probably ......."

Chelle told Arnold her guess.