The old things I repaired have become fine

Chapter 198 Shen Le: This memory almost drowned me!
There are specialties in the art industry, and every line is like a mountain.

They are all repairing wood, ancient buildings, antique furniture, and ancient shipwrecks, but they are not the same.

At the very least, the fact that the water content of the wooden boards of an ancient shipwreck that had been soaked in water for hundreds of years could exceed 200% was beyond his imagination.

Are you serious?

One kilogram of wood can absorb more than two kilograms of water?
This feeling has exceeded his common sense!
Shen Le was too embarrassed to ask. Fortunately, he still had reference books and papers to look up. He went back and looked through a lot of information and finally figured it out:

Ancient shipwrecks that have been soaked in sea water for a long time have their wood fiber tissue destroyed and the wood cellulose decomposed in large quantities due to water immersion, salt corrosion, and the action of microorganisms.

In general, cellulose accounts for about 50% to 60% of the dry weight of wood. After all of this is decomposed, what fills it up is water!

Shen Le took a deep breath. Then, he sincerely asked his doctoral fellow:
"So how do you measure the moisture content?"

"Use the drying method..."

Shen Le rolled his eyes with extreme resentment.

“Is there no non-destructive method of measurement?”

The drying method, as the name suggests, is to cut a small piece and weigh it; put it into the drying box for drying, weigh it again, and calculate the moisture content of the wood according to the formula.

Of course, there are still many details and precautions in the specific operation, but it is already the most general, accurate and simple method.

The problem is that this method requires cutting off several pieces of wood!
It's such a big ship, with so many planks, you can cut them at will. But my compass is so small, it can't withstand a cut here and there!

If the moisture content, salt content, sulfur content and wood species cannot be determined, many subsequent repair methods will not be effective!
"We can still make a rough estimate." There were heavy footsteps behind me, and the old professor who had been holding a magnifying glass and wanted to lean on the compass came over:
"Looking at the grain of the wood, it's not the ginkgo or tiger bone wood commonly used for compasses, nor is it camphor or nanmu, which are commonly used woods for shipbuilding.

If I could just cut a little piece..."

Shen Le silently put the compass back into his arms. The old professor looked at him, shook his head and chuckled:
"It only takes a layer of 0.1 millimeters. I looked at it and found that if you scrape off a very small and thin piece from the crack or the bottom, you can put it under a microscope."

Shen Le hesitated. He had to take down the copper frame anyway, and maybe unscrew the screws, and the surface would be exposed anyway...

When removing dirt, if you use a little more force with your hands, 0.1 mm will disappear, right?
But how to cut 0.1 mm?
The old professor continued to smile:
"You don't need to use a slicer, you can just cut it by hand - can you cut it?"

I won't!
What kind of god can cut a layer 0.1 mm thick? ! !

"Come, come, I'll teach you." The old professor waved to him confidently.

Shen Le walked up to him a little stiffly, and saw the old professor holding the wood in his left hand and the blade in his right hand, and gently pushed -

A piece of wood that is as thin as a cicada's wing and looks translucent and translucent? Shavings? It is attached to the blade.

The old professor moved his right hand slightly, and before Shen Le could see clearly how he did it, the translucent plant tissue had already fallen onto the slide...

"Come on, come on, give it a try." The old professor handed over the blade. Shen Le took the blade stiffly, pointed it at the wood that the old professor had just cut, and pushed it down...

"You're going in the wrong direction. You have to scrape against the direction of the cells. Only in this way can you scrape off a layer of cells!"

"Hand steady! Hand steady! It's only 0.1 millimeter. If your hand shakes a little, the cut will be uneven!"

"Angle! Pay attention to the angle! You can't cut it like this!"

"Be more confident! You can cut 50 microns, and now I'm only asking you to cut 100 microns. It's not difficult at all!"

A small group of students stood at the far end of the workbench, by the wall, and at the door, whispering to each other and shivering:

"The old man has arrested another person to practice knife skills."

"It's terrible, cutting by hand... now there are automatic slicers, why do we still have to cut by hand!"

"If the old man doesn't pass on this unique skill, he won't be willing to do it!"

Under the guidance, correction and scolding of the old professor, Shen Le was sweating profusely. He drew a line once and his hand shook. He drew another line and his hand shook again.

After scraping the wood for more than ten times, he finally found some feeling. He took a deep breath and silently practiced his internal energy:
Force yourself into a state of extreme concentration. Hold the blade steady, tilt it at 45 degrees, press it slightly into the wood, and push—

"Well, that's not bad this time! Come on, try again!"

The old professor's eyes lit up. He watched Shen Le push three times in a row, and visually estimated that he had met the requirements three times. He grabbed another piece of wood from the side:
"Come on, try this one!"

Shen Le was in a flow state while cutting the wood. He had no doubts at this moment. He took the wood and observed the grain, then raised his hand and cut it. As soon as he cut it, it got stuck.

"So hard?"

"What you just cut was pine wood, and this piece is camphor wood." The old professor smiled cunningly:

"Different hardnesses require different strengths. Come on, cut slowly, and you'll be done when you get to the ironwood!"

Shen Le's head buzzed and he felt dizzy. Iron, iron wood!
Old professor, do you think too highly of me?
Can something like ironwood be cut by hand?
It turns out that he can cut what others can't. The heat in his body flows rapidly, extending from his hands to the blade, pressing lightly, and then pushing lightly.

Brush, brush, brush, and slice continuously. Seeing that his knife skills were almost perfect, the old professor began to teach him the advanced version:
"Come on, let's try cutting in different directions. To look at wood cells, we need to look at three directions: tangent, radial and chord. Once you have practiced them well, you can cut on the compass!" Shen Le: ...

What, am I going to make so many cuts on the compass?!

Fortunately, each cut only required a thickness of 0.1 mm and a length and width of less than 5 mm. Shen Le practiced hard for a long time and actually cut out wood chips that met the requirements on the ironwood.

Then, following the old professor's instructions, he gently made three cuts on the surface of the compass, cutting out wood chips roughly equivalent to scraping.

Some students took the wood chips, ran to dye, dehydrate, make them transparent, and seal them, put them under an optical microscope to take pictures, and then ran to deliver the pictures.

The old professor put on his reading glasses, took a look at the photo, and nodded without surprise:
"Hmm, it looks a bit like a raft to me. Weigh it, measure the volume—volume can be measured with a scanner—and make a rough estimate of the density.

By comparing it with other wood of the same type, you can roughly estimate its moisture content.”

Wha...what?
Can you recognize wood from these cell photos? !
Before Shen Le could be surprised, the old professor gave a look and his students ran to turn on various instruments and let him do the work with their own hands.

Shen Le carefully pried open the connection bit by bit, removed the movable shaft and copper hoop from the compass, and then measured its weight and density.

Shen Le was already used to using the scanner, and the precision balance was not difficult to use, so he quickly got the data.

A huge table was opened. The students looked it up for a while and were surprised:
"85% to 95% water content!"

“Very rarely!”

“It’s basically like there’s no water at all!”

“Just a little dehydration, a little desalination, a little shaping and that’s it!”

Shen Le breathed a sigh of relief. As for how to dehydrate, desalinate and desulfurize to preserve the demonic energy or dead energy inside as much as possible, that was another question that needed to be studied slowly later.

Compared to before, the outer copper hoop and the ring movable shaft are easier to repair.

He first sent these metal parts to the metal flaw detector for testing. As expected, all the parts were generally intact, with only the joints being slightly blackened and corroded more severely.

Then use an X-ray fluorescence spectrometer to test and divide the rusted area into four layers, namely black corrosion layer, green corrosion layer, blue corrosion layer and red corrosion layer.

It was confirmed that the copper hoop and ring were made of red copper, which was quite corrosion-resistant in seawater. Except for the connecting parts, there was only a small amount of rust.

Then use a scalpel to carefully remove the condensation and rust on the surface. If it is really hard to remove, use an ultrasonic dental scaler...

"A dental scaler?!"

Shen Le was stunned: "Isn't it the kind of thing you use to wash glasses that will do?"

"How can that thing have enough power!" The graduate student who was working with him rolled his eyes at him:
"That kind of thing is only used in small studios! In a museum like ours, the things we clean have been buried in the sea for hundreds of years. How can an ultrasonic cleaner for washing glasses be used!"

"Small Studio" Shen Le was shot in the knee by an arrow and said nothing. After the decontamination, it was desalination. The large barrel of deionized water - Wahaha - was directly soaked for desalination;
Of course, the things used in the museum are much more advanced than those in Shen Le’s home. There are even things like digital display constant temperature magnetic stirrers that can continuously circulate the deionized water between hot and cold.

In addition to stirring, the conductivity of the copper mirror must be continuously measured. When the conductivity stabilizes at a relatively fixed value, everyone will naturally know that desalination is complete.

After working to this point, Shen Le finally saw the dawn of victory. But it was not over yet. The copper rings and copper frames that were fished out had to be dehydrated and dried using anhydrous ethanol and acetone.
After drying, soak the objects in 5% BTA alcohol solution, keep it in a sealed state for 1 to 2 hours, take it out and dry it to remove the crystals precipitated on the surface and complete the surface corrosion inhibition pretreatment.

Finally, carefully apply a layer of 3% B72 acetone solution, and then apply a layer of microcrystalline wax to further seal...

"Ah, finally done!"

Shen Le let out a long sigh, sorted out all the metal parts, and assembled them one by one.

I turned it left, right, left, and right in my hand, and I was very satisfied:

The copper frame and copper ring became shiny, moved flexibly, and were intact as a whole;

Under the spiritual eyes, the black air that permeated it became a little lighter, no longer so violent and gloomy, but there seemed to be another breath faintly revealing from it.

Perseverance, defying the wind and waves...

"I'll put you back. Can you tell me some of your memories? Tell me why you're so upset and how can I comfort you?"

Shen Le gently stroked the copper rings and placed them next to the deep wooden groove of the compass.

Suddenly, a huge wave hit him and almost choked him to death:

"Oh my god! The interaction between these memories is so strong!"

“You almost drowned me!!!”

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(End of this chapter)