The water of roe is so dangerous that it will cause huge damage when it encounters people. In desperation, Malin had to temporarily give up the experiment of water of roee's corrosion iron gate and instead develop a gas mask first.

Gas mask Marin is not unfamiliar with it. When raising silkworms in his family in his previous life, he had to sprinkle quicklime frequently to disinfect them. Therefore, Marin's mother always wears the farmer's version of gas mask. The so-called farmer's version of gas mask is actually the original gas mask, which removes the most core activated carbon part. Because the farmer's version of gas mask mainly prevents the eyes and respiratory tract of silkworm breeders from burning by quicklime. Just add a simple filter screen, even without activated carbon. After all, quicklime is solid, not poisonous gas.

If Marin wants to get a real gas mask, she actually only needs to fill the filter screen in front of the mouth and nose of the farmer's version of the gas mask.

But first... Marin needs to get activated carbon first...

So Marin found a craftsman and first made a simple farmer's version of the gas mask. This was easy, but it was all sewn with leather on the edges of his eyes and wrapped in a cover-like space. Because there was no plastic, Marin directly used a wooden shelf. Marin's craftsmen could even make pocket watches, and this simple gadget was made without any effort.

Then, it is to make activated carbon. This is more troublesome. Marin remembers that activated carbon mainly includes chemical activation method and water vapor activation method.

However, Marin remembers that activated carbon produced by chemical activation is often toxic and can only be used to remove impurities and filtration in industry. Activated carbon used in food production is often produced by impacting charcoal with high temperature water vapor. Chemical activated carbon is often produced directly with coal.

Chemical malin is not very clear about the technical content, but physical malin still remembers it. The specific process is to first place wooden materials such as coconut shells in a furnace with high temperatures and isolate the air to heat them, so that they can be carbonized into charcoal. During the carbonization process, substances such as wood or methanol inside the coconut shells evaporate at high temperatures, and first some pores are left inside the charcoal. But this is not enough...

After that, put the smaller charcoal on the metal filter and put it into the furnace. High-temperature and high-pressure water vapor is introduced, and the charcoal on the metal mesh is severely washed away from bottom to top to generate more voids, which is conducive to adsorption. This water vapor is often at a temperature of more than 500 degrees, and can even reach 800 degrees...

...

OK, high temperature and high pressure water vapor... This is to force Marin to build a pressure cooker...

Didn't say anything - get on the pressure cooker first...

Then, a pressure cooker with soft and thick elephant skin as a leather washer was born...

In fact, when Malin was making paper, he made a large sealed metal container and added cowhide gaskets to hold his breath. However, cowhide was a little thin and the effect of holding his breath was not very good. But no matter what, it was enough.

And this time, when Marin sent people to Senegal to hunt rhinoceros skin, he hunted many elephants by the way. Therefore, the thick and soft elephant skin was sent to the local area.

Although the elephant leather is thick, it is too soft and not big for armor. However, it is very suitable for making genuine leather sofas, which is much more comfortable than cowhide.

And now, Marin suddenly discovered that thick and soft leather, such as elephant leather, seems to be very suitable for making leather washer for pressure cookers...

Even the edge of the gas mask, in order to make the face and the gas mask have no gaps, Marin also used soft and thick elephant skin to replace the rubber edge of the gas mask in later generations to achieve the effect of fully holding the breath.

After the pressure cooker was finished, Marin made a metal mesh with copper wire, but the copper was easily oxidized under high-temperature water vapor. Therefore, Marin threw the copper mesh into the zinc liquid and soaked it, resulting in a galvanized layer. The zinc liquid was easy to oxidize, but after oxidation, the oxide layer formed was very corrosion-resistant and oxidized.

Then, Marin asked someone to build copper tubes and boilers to create a system for producing activated carbon. Then, Marin ordered the pressure cooker to boil water...

The pressure cooker made by Marin is different from the small pressure cooker in later kitchens. The wall thickness of this pressure cooker used for industrial production is very thick and the lid is also covered with a heavy locking mechanism. In this way, it is not as easy to fry as the pressure cooker in later kitchens.

After cooking for a while, it felt almost done. The worker wearing armor to prevent the explosion pulled down the valve...

Suddenly, a high-temperature and high-pressure hot water vapor rushed violently along the copper tube toward the copper furnace, swept through the metal mesh at a rapid speed, and washed the charcoal particles on the mesh. When the water vapor passed, the charcoal particles fell back on the metal mesh...

After that, Marin had someone do it repeatedly so many times before taking out the activated carbon...

...

After getting activated carbon, the effect will naturally be tested. Marin put the activated carbon into the farmer's version of the gas mask. Then, find someone to test the effect...

This time I was testing the poison gas, so I naturally wouldn't find my soldiers. Then, a death row prisoner in the prison was brought out...

Marin asked someone to tie the death row prisoner up and his face was fixed downward. Then, he put a bottle of water in front of him and threw another piece of iron into it...

The iron block entered the regia and churned violently, and the reaction speed was very fast. Then, a large amount of nitric oxide gas floated up and rushed straight to the death row prisoner's face...

But until the iron block dissolved, the death row prisoner did not fall into a coma...

"Very good, one success!" Marin clenched his fists happily.

It's no wonder. After all, Malin had come into contact with the farmer's version of the gas mask in his previous life. When he was a child, he often took his mother's farmer's version of the gas mask to play war games with his friends. Therefore, he still knows the gas mask very well. Otherwise, it wouldn't be so easy to imitate. If it were something he had never seen before, even if he knew the principle, it wouldn't be so easy to make.

In addition, elephant skin is really a good thing, thick and soft. In many occasions, it can completely replace the role of rubber. The rubber trees promoted by Marin have not grown for 6 years and cannot be cut into rubber. Therefore, I had to deal with it with elephant skin first.

As for protecting elephants? Don’t joke! Later generations protected elephants because humans used advanced hunting guns to hunt too many elephants, which made the elephants endangered, so they needed to protect elephants.

In this era, elephants basically have no natural enemies. Because even the elephant herds are lions, they dare not provoke them. Even those powerful tribes in Africa have to be mobilized to provoke them.

Marin later saw a video of Lao Hei hunting elephants with a javelin. In that video, Lao Hei was everywhere in the mountains, at least thousands of people. In order to prevent the elephants from fighting back, they dressed themselves up in a fancy way (actually to scare beasts), and then kept making ghosts and howls to scare the elephants. The elephants were indeed scared and began to run away. At this time, these Lao Hei really started to hunt down elephants with javelins. If the elephants were not scared but were angry, they would be trampled to death by many people...

Moreover, it is difficult for stone javelins to pierce thick elephant skins, and they can be easily achieved unless they are metal spearheads. Therefore, in this era, there are very few Lao Hei who dare to provoke elephant herds. Because most of Lao Hei at this time were in the Stone Age.

In front of the powerful "Elephant Master", Lao Hei of the Stone Age was frightened and shivered. He was afraid of being ruined by elephants in farming. How dare he harm the elephant?

Therefore, Marin sent people to kill elephants in Senegal, and even received gratitude from the local Lao Hei...

...
Chapter completed!