In the room, Su Xiaoxiao and Su Xiaocao were absorbed by Jiang Chao's boxing technique, and they looked over unconsciously, and the two stretched out their hands to gessy.

When Jiang Chao saw this scene, his heart moved slightly, it was impossible for him to stay by their side every day in the future, or it would be good to let them learn some self-defense techniques.

He beckoned to the two sisters, and Su Xiaoxiao's face showed a happy color, it seemed that she was also interested in boxing. Su Xiaocao's face was also full of longing.

Jiang Chao taught the two sisters boxing with one hand and one foot, they have a talent for martial arts, and Jiang Chao can understand the movements almost once.

Jiang Chao explained the key to them, and took them to fight again.

Next, the two sisters slowly familiarized themselves with it again, and when Jiang Chao began to build bamboo mines, they began to review the knowledge they had learned at night.

He didn't make much bamboo thunder this time, and he needed to study the bamboo mines used in mortars several times.

Although, the knowledge he has learned makes him very familiar with making explosives, and he can easily create bamboo mines.

But to make a bamboo mine like a mortar, it still takes several tests.

If, after the test is successful, it will not be so simple to mass-produce.

This kind of bamboo mine can't be caused by filling it with some gunpowder. How to fill the gunpowder that does the thrust of the base part is a problem.

However, this was difficult for Jiang Chao, and with his ability, he quickly thought of a solution.

In terms of iron sheets, the output of nine blacksmiths may not be able to be raised. Technological backwardness is a hard wound.

Jiang Chao was wondering if he should make a steam engine. It's just that the technical difficulties of the cylinder layer are afraid that they will not be able to overcome it for the time being.

He dismissed this idea for the time being, and some ideas could only be implemented slowly.

However, when Song Ningxue left, Jiang Chao had already asked her to look for blacksmiths and workers who made firecrackers.

These workers can temporarily help Jiang Chao make bamboo mines, as long as ten workers and twenty or thirty apprentices, they should be able to solve the problem of mass production of bamboo mines for the time being.

As for the bamboo mines of mortars, the yield may not be too high, but I believe it should be enough.

Anyway, the mortar bamboo mine is temporarily used as a secret weapon, and the bamboo mine is the most important weapon at present, but the bamboo mine is still not as good as the mortar bamboo mine.

First of all, in terms of lethality, bamboo thunder is not as good as mortar bamboo thunder. Mortar bamboo mines with iron sheets are at least several times more lethal than bamboo mines.

In terms of attack distance, even if there is a simple trebuchet to drop, the distance is not as good as mortar bamboo mines, and the farther the strike distance, the worse the accuracy of bamboo mines.

Early the next morning, Su Xiaoxiao and Su Xiaocao got up with Jiang Chao to box.

After the fight, Jiang Chao took ten bamboo tubes to make bamboo thunder and some gunpowder to the iron-making workshop, he wanted to see the progress of iron-making, and by the way, he made mortar bamboo thunder.

The matter of the bandits in Jiming Mountain made him have to be urgent.

The affairs of the family were handed over to Su Xiaoxiao. In the past few days, although Su Xiaoxiao is in charge of cooking, she is also in charge of the production of soap and perfume.

The soaphorns and flowers were almost mashed and set aside, just waiting for Song Ningxue to send wine and lard.

Jiang Chao specially taught Su Xiaoxiao how to make soap and perfume last night. And let her try it out a few times.

These are actually very simple, just a few operations, you will know how to do it.

There are also several stoves in the house, which are used to make perfume and soap in addition to cooking.

When Jiang Chao arrived at the iron-making workshop, nine blacksmiths were gathered in front of the blast furnace, their eyes blood-red, as if they hadn't slept all night. But his eyes were clearly full of excitement.

Seeing Jiang Chao coming, they hurriedly ran over in surprise. He was very excited.

According to Jiang Chao's method, the quality of the copper and iron they smelted amazed them.

In particular, when the furnace fire reached more than 1,500 degrees Celsius and the iron and copper melted into liquid, they could hardly believe what they saw.

They had only seen copper melt into liquid, but they had never seen iron melt into liquid.

Moreover, the liquid made of copper is viscous, not like water, as it is seen today.

When the molten iron and copper water are cooled, the quality of the iron and copper is simply indescribable.

Even if they forged thousands of times, they were afraid that they would not be able to obtain such quality iron and copper.

At this time, they found out where the blast furnace built by Jiang Chao was different, and the position of the lower layer of the blast furnace was connected to molten iron and molten copper.

The nine blacksmiths had already regarded Jiang Chao as a god, so they almost knelt down and worshipped. They cast some pieces of iron according to Jiang Chao's explanation.

It's just that after these iron pieces are cast on the refractory mold, according to Jiang Chao's requirements, they still need to be tempered, and nine blacksmiths tempered more than 30 pieces.

As for the cast small barrels, they all failed. Either the mold is not done well, or the casting is not in place.

Still, it's a good start. Only after experiencing failure can we slowly succeed. Jiang Chao told several blacksmiths about the reasons for their failure.

The nine blacksmiths humbly accepted, their eyes full of longing for technology.

Jiang Chao himself also cast it once, and the cannon barrel that was cast was very rough. But it was a success, and it barely worked.

Mortars do not have high requirements for gun barrels, not to mention that Jiang Chao's mortar bamboo mines can only be regarded as the most primitive mine.

Gunpowder was used. It's not smokeless gunpowder, and in terms of power, it's a little worse. The damage to the barrel is also weaker.

Jiang Chao put the barrel aside and began the assembly of the mortar bamboo mine.

He first loaded the iron sheet into the bottom of the bamboo tube, and then pressed a piece of gunpowder under the iron sheet.

Then, it was to fill the bamboo tube with gunpowder, and Jiang Chao did not fill it with iron slag. It's not too late to fill in this test when it's successful.

After sealing the bamboo mine, a mortar bamboo mine is completed.

Jiang Chao lit the bamboo thunder and put it into the barrel, and a few seconds later, the bamboo thunder in the barrel shot out angrily with a muffled sound.

The powerful thrust generated by the gunpowder under the iron sheet of the bamboo thunder, under the action of the cannon barrel, pushed the bamboo thunder out.

With the protection of iron sheets, the power generated by the gunpowder on the base is blocked, otherwise, the bamboo thunder will have exploded in the barrel.

The bamboo thunder instantly landed at a position of a hundred meters. The fuse was almost to the bottom at this time, and bam...... With a loud bang, the bamboo thunder exploded.

The experiment was barely successful, but there were too many shortcomings.

The base gunpowder is still not enough, the thrust is insufficient, and the bamboo mine is not fired far enough. In the case of fuzes, the length may be shorter. The explosion was a little faster.

Jiang Chao was calculating the shortcomings, and he was thinking of ways to improve.

The nine blacksmiths on the side looked at him in astonishment, and did not come back to their senses for a long time. The power of bamboo thunder just now. But it scared them.

They couldn't have imagined that Jiang Chao would be able to make something so powerful.