Mr. Pierre is a very creative young man.

Although the steampunk-style machine last time was not effectively used and promoted, it is still a very rare invention.

During this time, Mr. Pierre immersed himself in mechanical research all day long, using his intelligent mind and rich imagination to try to create a convenient and fast retrieval machine.

"So, this table-like thing, could you please demonstrate it?" Elena said meaningfully.

In front of them at the moment was a square panel painted with some criss-cross lattice patterns, surrounded by rows of buttons. If you look closely, you will notice that this is a flat microcosm of the distribution of bookshelves in the library.

"Is this a retrieval machine?" Miss Margaret leaned down and observed curiously the pattern on the table.

Just when Bella and Elena were returning to the salon, Mademoiselle Marguerite heard that they were going to the library of the University of Paris, and she was eager to come with them.

Because she had heard Elena say that Monsieur Pierre of the library had invented an interesting "retrieval machine" that would "clang" and rattle.

"What do you mean by the sound of 'clanging and booming'?" Monsieur Pierre was a little speechless at the way this was described, and he was really unable to complain, "However, although the 'Ratatosk' last time looked more handsome, it was actually not very easy to use. Not only are the steps cumbersome, but also inefficient."

Ratatösk is a squirrel in Norse mythology that lives on the World Tree, because it is lively and active, often climbing and jumping back and forth on the World Tree, passing on the words spoken by the giant eagle that lives above to the dragon that inhabits below, and then passing on the words heard from the dragon to the giant eagle. There are symbols like "messengers".

"Then this is the Ratatosk II?" Elena asked.

"Uh...... Let's call it that."

Monsieur Pierre didn't really care, but the way he chose his name was quite novel.

From Bella's point of view, this bizarre naming convention is in fact a pinning on Monsieur Pierre's hopes.

He may be hoping that it will make it easier for readers to find the information they need.

After a while, Mr. Pierre began to show how to use the "Ratatorsk II".

"I've numbered each of the different books." "For example, the rose I was looking for last time was first and foremost biological, so it was X."

As he spoke, he pressed the top row of the table from the tenth button on the left.

"Immediately after that, the botanical classification is VI."

Monsieur Pierre selected the left column again, counted the sixth button from top to bottom, and pressed it gently.

After that, he pressed a button in the right column and the bottom row in turn.

After all four buttons were pressed, the pattern on the tabletop, where there was a bookshelf, suddenly lit up.

It seems that this time the lights were installed in the table.

"Just remember the number and location of the bookshelf and go back and look for it. It doesn't affect the next person's use."

Monsieur Pierre said, pressing a button on the top right corner of the table, and in an instant all operations were restored to their original state.

"Looks a lot more flexible." Elena commented, "But I still think that big guy looked a little more handsome last time, and he felt a lot of feelings!"

"Ugh...... Really." Monsieur Pierre didn't know how to respond, so he smiled awkwardly.

"Quick, let me try." Miss Margaret looked gearing up, "What books are you looking for?"

"Black magic." Bella said.

"Well, the dark arts...... Let me think, it should belong to the occult, right?" Miss Margaret glanced at the list next to her, "There you have it, the last one."

She found the corresponding button and pressed it hard.

"And then there is - divination, elementals, summoning, cursing...... It should belong to the "forbidden arts", right? And the last one."

Margaret said, pressing the corresponding button.

"Huh? Why is it gone?" She was a little confused, "Am I looking for it the wrong way?"

"If the following classification is unclear, or if there are some things that are inconvenient to classify, you can click here." Mr. Pierre pointed to a circular button in the lower right corner and said, "It displays all the categories of bookshelves currently selected."

"Is this it?" Margaret said, pressing as instructed.

Two light-up bookshelves appear on the display panel.

"It's all here. Because there are not many documents in this part in the first place, and few people usually look for them, if they are to classify them, it will not only be troublesome, but also cause unnecessary trouble." Mr. Pierre said, "Generally, I put some unpopular subjects together, so that it is much easier to find them."

If there are only a few books, and there are several categories, then the search will become extremely cumbersome, but it will be redundant.

According to the location marked on the panel, everyone quickly found the corresponding bookshelf.

Both are located in the corners.

"It seems that it is really unpopular." Elena sighed.

"Because things like black magic are originally forbidden by the Magic Association. Therefore, most people are afraid to approach." "And according to the rules, these books are not allowed to be borrowed. But you can watch it here."

"Thank you so much." Bella thanked her and searched for the information she wanted on the shelves.

Elena also helped start the search from the other side.

Marguerite followed Monsieur Pierre back to the front desk. She also wanted to play with the magical "Ratatosk II" again.

Monsieur Pierre was also with great interest to accompany Mademoiselle Marguerite.

Originally, the machine had just been completed, and it had only been simply adjusted, and it was not without strict proofreading of each type of bibliography. At this time, Mademoiselle Marguerite was so active that she was helping Monsieur Pierre to find the loopholes.

According to Fang Cai's demonstration, Margaret tried several more times, and the lights on the panel came and went.

About ten minutes passed.

"Huh?" Miss Margaret stopped suddenly, "Why isn't it bright?"

She tried again a few more times, but there was still no response.

"What's wrong?"

Monsieur Pierre was kneeling at the counter at this time to copy the latest notes of borrowing and returning books, and when he heard Marguerite's voice, he put down his pen and got up and walked over.

"It doesn't seem to be responding." Margaret said, "I've tried several times."

"What book are you looking for?" Pierre asked.

"'Gallic Wars.'" Margaret replied.

The Commentarii de Bello Gallico (Commentarii de Bello Gallico) is a work by Gaius Julius Caesar, a famous Roman ruler.

"I think the book was on shelf X.VII. in Section B." "Try again, let me see."

Margaret pressed the buttons again in order.

"Well, there's no problem with the method of screening." As if talking to himself, Mr. Pierre said, "The buttons are in the right order, why aren't they displayed?"

"Could it be that the battery is out of power?" Miss Margaret said.

"Probably not...... Mister Pierre crouched down and checked the power cord behind him, "The power supply is normal......

He stood up again and pressed the side button according to the other category, and the corresponding position quickly lit up.

"Well, it's a little bit." Pierre was still talking to himself.

Immediately afterward, he operated according to the category of "Gallic Wars" again, but there was still no response.

"Could it be that something is wrong with the wiring?"

Subsequently, he tried several other adjacent books. As a result, all the books on the same shelf as the "Gallic Wars" were not lit up.

"Looks like it needs to be double-checked."

As he spoke, Pierre walked back to the counter, rummaged through the cabinets below, took out a wrench and a pack of other tools, and returned to the Ratatorsk II.

He cut off the power supply, then removed the panel from the shelf, buckled it back to the floor, and began to disassemble it from behind.

After unscrewing a dozen screws, Monsieur Pierre finally opened the back cover.

"Wow ——!" Miss Margaret's eyes widened in surprise.

It was as if he had seen a miracle appear.

Countless parts and interfaces are exposed to the air, and the colorful wiring is a dazzling fireworks.

"It turns out that the interior of the 'Ratatosk II.' is so complicated." Miss Margaret couldn't help but sigh.

It is hard to imagine how Monsieur Pierre managed to grasp such a complex structure.

Moreover, this thing was invented by Monsieur Pierre himself!

"The lights aren't broken...... Pierre continued to mutter, intently inspecting every detail of the interior.

Mademoiselle Marguerite just stood by and watched quietly, not daring to make a sound, lest she disturb Pierre's train of thought.

After a while, Monsieur Pierre seemed relieved.

"It turns out that the thread is not in good contact." Pierre said in a normal voice, "I'll pick it up again later."

With that, he took out a large push of tools and materials—none of which Miss Margaret did recognize—from his bag, and began to tinker with them.

It took about a dozen minutes for Monsieur Pierre to finally close the lid, screw it back, and put the panel back on the shelf.

When I turned on the power again, I saw that all the lights on the panel were on for a while, and then all went out.

I searched the "Gallic Wars" again, and this time the bookshelf at X.VII. in Area B finally lit up.