The 3,000 battalion is the forbidden army that guards the capital, and it has a slightly better literacy rate, at least most of the soldiers can write their own names, so they can barely step through the first hurdle.

But in the future, military strategy, talent learning, and virtue are the real screening out of the gap between ordinary people and talents.

Chen Kan stepped down from the platform, and Fang Xu took over the command.

After screening out some of the soldiers who couldn't even write their names, they directly started the Smash Bros. mode.

Since it is necessary to select the strongest, it is naturally the Smash Bros. mode that can best screen talents.

Although this will make some soldiers with low force value but good brains eliminated early, this era is never fair.

The first phase of the Navy Academy plans to enroll 6,000 people, and the army of the Ming Dynasty has 800,000 if not 1 million, and it is unfair to select 6,000 people out of hundreds of thousands of people.

Because the commander of the 3,000 battalion is Chen Kan, and the Navy Academy was also proposed by him, he can give 100 places, which can already be regarded as Zhu Neng giving Chen Kan face.

That's right, the head of the Navy Academy is Zhu Neng, who has stepped down as generalissimo since Annan's return to the dynasty.

Zhu Neng used a hundred places to end Chen Kan's love for the policy of safe south.

Although the first credit of Ping'an Nan is still Chen Kan, how to reward it is a matter of the imperial court, and it has nothing to do with him Zhu Neng, and he Zhu Neng no longer owes Chen Kan anything.

It is worth mentioning that Sheng Yong finally got his wish and left a thousand-year-old reputation, when he captured Thang Long City, he led the army to attack the city, and finally died under Thang Long City.

Zhu Di thought a little bit of affection, and in the end he did not kill the family of the Marquis of Licheng, but only took back Sheng Yong's title.

It was not difficult to choose a hundred out of 4,000, and it was even faster than anyone expected.

In just half an hour, only the strongest hundred people were left in the field.

Without him, everyone wants this kind of opportunity to ascend to the sky in one step, and naturally no one will keep their hands when they move.

When everyone is heavy-handed, the winner is naturally fast.

The 100 people standing in the teaching field were satisfied, while the rest of the soldiers were lying on the ground and rolling in pain.

Of course, everyone is a robe of life and death after all, so no one is stubbornly defending.

The wounded soldiers only need a few days of recuperation before they can recover.

Chen saw that he gave the 100 people standing in the teaching hall the travel expenses, and gave them identity plates, and let them go on the road.

Chen Kan still had to stay in Beijing to wait for news, so naturally it was impossible to go with them, and the soldiers didn't say anything, received the travel fee and identity plate, and packed up their clothes and went south together.

Except for the change of clothes, they couldn't take anything with them, whether it was a war horse or a blade armor, it was something that belonged to the 3,000 battalions, and they no longer belonged to the 3,000 battalion sequence, so naturally they couldn't take it away.

After taking care of the affairs in the barracks, Chen Kan took his horse back to the Hou Mansion.

Today, he made an appointment with the three little guys to burn paper glass to make a microscope, so naturally he couldn't miss the appointment.

"Driving~"

Chen Kan beat the war horse fast, but the direction of the road was not the Hou Mansion, but the cement factory where the cement was burned.

Glass, that is, glass, is made up of silicon in the sand, which still needs to be calcined at high temperature to form.

In the past, Chen Kan felt that it was too troublesome to burn paper glass, so he was too lazy to do it.

But now it can't be burned, the schoolwork of the three little ones has caught up, and the microscope is an indispensable tool for observing natural science.

If I want to continue teaching them, I can't afford to delay it any longer.

Daming also has a method of firing colored glass, but its quality, Chen Kan thinks it is better than the crystal dug out of the cave, the transparency is too low, there are too many impurities, and it can't be polished with the precision he wants.

Seeing the smoke billowing from the large chimney of the cement factory from a distance, Chen Kan could already smell the smell of lime.

Chen Kan crossed the cement factory and headed straight for a new cave.

The cave is made of red bricks and cement, but there is no risk of blowing up the kiln.

Zhu Zhanji, Huashi, Zhu Zhanji, and the three little children were already waiting in front of the cave accompanied by craftsmen.

At this moment, seeing that Chen Kan was finally late, the three little guys suddenly greeted him.

"Teacher, you're here."

"Hmm!"

Chen Kan nodded, and didn't talk too much nonsense, and asked directly: "Are the things that the teacher asked you to prepare ready?" ”

The three little guys nodded, and then pulled Chen Kan to a pile of tools.

Scales, stone mills, iron tongs, grinding, crucibles made of clay, a pile of quartz sand that glows in the sun, a pile of soda ash, a pile of coral in poor condition.

And a whole bunch of burnt coke.

This is what Chen Kan asked them to prepare.

The raw materials needed to fire glass are very simple, quartz sand, that is, the main material of glass, silicon, soda ash plays the role of sodium carbonate, and coral is calcium carbonate.

Chen Kan didn't know the specific proportions of the three things, so he needed to experiment again and again.

But Chen Kan is sure that with the raw materials he prepared, even if the proportion is wrong, the quality of the fired glass will definitely be better than that of Daming.

Because Chen Kan had visited the kiln of Daming to burn paper glass, they were still using eggshells instead of calcium carbonate.

Now that you have the tools ready, let's get to work.

Chen Kan put some diamond-like quartz sand into the stone mill and began to grind, while the three little ones took out small notebooks and charcoal pens and began to record.

How much is fed, what is burned, and what is the ratio, these are all things that they need to record in this experiment.

After studying with Chen Kan for so long, the three little guys have deeply understood the importance of data.

After grinding the quartz sand, then grinding alkali and grinding coral.

These raw materials need to be ground to pulverization.

The raw materials ground out by the stone mill were not fine enough, and after Zhu Zhanji passed the raw materials through a sieve, he poured the coarser particles in the sieve into the grinding mill and continued to grind them with an iron pestle.

Then, the matter of recording the data was taken over by Hua Shi and Zhu Zhanyan.

Half an hour later, there were three more cylinders of powder in front of several people.

Chen Kan instructed the craftsmen on the side to start the fire, and then took the three little ones to mix the three powders with water according to different proportions.

The clay pot containing the mixed powder is also marked by the three little ones, so that it is easy to distinguish which jar of experimental object is in what proportion.

The coke was quickly ignited, and there were more than a dozen clay pots in front of Chen Kan and the three little guys.

The clay pot is fixed with iron tongs and placed into the fire through a hole in the waist of the kiln, and the firing process is officially started.

After doing all this, Chen Kan wiped the sweat from his forehead, sat on the side and began to wait.

The coke of this era was not pure, so it was not burned very sufficiently, and it was even more difficult to reach high temperatures of several thousand degrees.

So if you want the materials in the clay pot to melt into glass water, you have to wait a long time.

The craftsman was naked, pulling the bellows that had been blown into the cave with a hunting sound.

The gradually rising temperature made the craftsman sweat in large drops, but he was still vigorously agitating the bellows.

The three little ones couldn't stay idle, and the observation port that flowed out of the cave kept staring at the changes in the clay pots in the kiln, and from time to time they would record something in the notebook.

Chen Kan is far away from the kiln, not worried about the cave exploding, this season does not rain or snow, the possibility of the cave exploding is not very likely, mainly because the place near the cave is too hot.

The guards brought a small table, and set up rice wine and candied dried fruits for Chen Kan, and Chen Kan lay on the rocking chair and closed his eyes to recuperate.

A mouthful of candied fruit and a mouthful of dried fruit, and then sent down with rice wine, this day, I won't change it for an emperor.

It would have been perfect if it hadn't been for the shouts and exclamations of surprise from the three little ones.

Chen Kan had been lying on the recliner for a long time, and when he was struggling with the tide of sleepiness, Zhu Zhanji's babbling voice suddenly came.

"It's melted, teacher, the powder in the clay pot is melted."

The sound came from far and near, and Chen Kan couldn't sleep.

Chen Kan sat up and scolded: "If you melt, you will melt, what are you talking about?" ”

Zhu Zhanji was very accustomed to Chen Kan's scolding, so there was no fear or anything like that, and he suddenly leaned into Chen Kan's ear and asked, "Teacher, when will you be able to get out of the kiln?" ”

Chen Kan waved his hand impatiently and said: "Continue to watch, when you see that the sand in the crucible has completely turned into water, and there are no black spots and impurities in it, you can take it out and cool it down naturally." ”

"Oh, got it!"

Zhu Zhanji responded, and Chen Kan lay down again.

This time he couldn't win the tide of sleepiness.

After a while, the sound of Chen Kan falling asleep sounded on the recliner.

Half-asleep and half-awake, Chen Kan didn't hear the sound of the three little guys babbling anymore, I don't know how long he slept, Chen Kan was about to turn over and change his position to continue sleeping.

"Bang~"

A deafening explosion suddenly sounded in Chen Kan's ears.

"it!"

Chen Kan was directly frightened out of the quintessence, and the whole person jumped up from the recliner at once.

"What's the matter, the kiln is blowing?"

Chen Kan was still a little stunned, and he heard a noise not far away.

"Save people, save people."

The exclamation did not belong to any of the three little ones, it seemed to be the craftsmen who had rushed to help.

Chen Kan hurriedly trotted in the direction where the explosion came from: "What's the matter, what's going on?" ”

Hearing Chen Kan's voice, the crowd surrounding the three floors inside and the outside three floors made way for him.

Chen Kan walked all the way to the source of the explosion, his face suddenly sank, a craftsman sat on the ground covered in blood, and the three little guys stood on the side at a loss.

Two other craftsmen were cleaning the shards of glass from the bloodied craftsman.

Chen Kan glared at the three little guys fiercely: "Didn't you say that you should be cooled down naturally, who let you use cold water?" ”

After reprimanding the three of them, Chen Kan hurriedly came to the craftsman: "How are you, it's okay, right?" ”

The craftsman smiled innocently: "Master Hou, it's okay, it's all some skin injuries." ”