Hong Chengchou did send someone to deliver more than a dozen barrels of gunpowder. What is exciting is that in a hurry, six of them were saltpeter powder that had not been purified. In addition, two barrels of sulfur were also included.

The cannon is too late to forge, at least it can make a few packs of black gunpowder. If it is proportional to gold, its power is enough to shock the world.

Prince Zheng Jiergalang and Dorobele Dododo, who were sent by Huangtaiji, arrived in Yizhou for a drink.

"Flowering Bullets" are ammunition that uses the fragments and shock waves generated after the projectile explosion to kill or explode. This is what we often call grenades and grenade shots. Grenades and grenade shots with advanced fuse technology are used to hit far, have good safety, and have accurate timing of explosion, and are specially designed to deal with infantry.

In fact, there were already flowering bullets in the Ming Dynasty. The powerful flowering bullet was many times more powerful than the solid bullet. The sound of the solid bullet was huge, but it was just using the impact of the projectile to injure the enemy. In fact, it had great disadvantages.

So why did the Ming Dynasty have flowering bullets but not popular? The reason is that the so-called "flowing bullets" in the Ming Dynasty are all two different things. The early flowering bullets were very difficult to operate and dangerous.

There is no such advanced fuse at all. The fuse used to detonate is usually a hollow reed tube built-in medicine twist. Before loading, cut the corresponding length according to the distance of the target to be shot. Before firing, ignite the shell from the muzzle, and then fire the fuse on the fire door.

Such a firing method is very dangerous, because the flames generated by ignition of the launcher run from the gap between the shell and the barrel to the front of the shell, which is very easy to ignite the exposed medicine twist, resulting in advance explosion or even explosion of the chamber.

What Zhu Cilang did was this kind of flowering bullet.

He used wooden conical tubes and wooden support technology. In addition to effectively sealing gas leakage at the tail of the shell, it can also serve as a buffer for hollow grenades during firing. Moreover, the emitted grenades will cause the "badminton principle" self-stabilization structure of heavy head and light tail due to the light wooden support, making the ballistic more accurate.

The structure of the time fuze is generally a hollow wooden pipe with open ends, which contains a slow-burning gunpowder with a very stable combustion speed. The wooden pipe is marked with a scale. When using it, the gunner first estimates the firing distance, finds the flight time corresponding to the type of shell from the gun manual, and then press the knob on the fuze to adjust the detonation time. At the same time, punch a hole in the corresponding position of the fuze, and finally stuff the fuze hole of the shell.

At this time, one end of the fuse is exposed outside the shell and the other end is in contact with the explosives in the shell. Finally, the shell is stuffed into the barrel and the position of the fuse is forward. Since the diameter of the inner chamber of the smooth bore front-loaded artillery is slightly larger than the diameter of the shell, when the launcher explodes, part of the flame penetrates from the gap between the shell and the barrel to the front of the shell, directly igniting the part exposed outside the shell. After the shell is flying in the air for a specific time, the fuse is burned to the position of the explosives in the shell at the previously adjusted time, ignite the explosives, and the shell explodes.

It seems that the technology is not difficult. Since Zhu Cixuan knows the principle, it will be much easier when he does it again.

Unfortunately, time is in a hurry. It is estimated that in more than half a month, Jiannu's iron cavalry will be at the city.

No matter how many you can make, it is only a few. Even if you only make one, at least it will let these Jiannu try it out.

Natural saltpeter often contains magnesium salts and calcium salts. When treated with wood ash water containing potassium carbonate, the magnesium salt and calcium salt will react with potassium carbonate to form magnesium carbonate and calcium carbonate precipitation, thereby achieving purification of saltpeter.

When the salt is scraped, it is soaked in the tank for a night of water, and the filthy things float on the surface... and several pieces of lacquer are cooked together, poured into the basin, and it becomes white snow after the basin. Then the basin is extinguished.

The method of nitrogen extraction was still in use until modern times, and this is a relatively scientific method. In addition, there are sulfur purification and charcoal burning methods.

Recharge the yellow, use five or six bowls of water for each pot, and boil it. Then add 3 or 40 kilograms of yellow and fry it... Wait until the yellow on the oil is soaked until half a pot, then take it, put it in a cold water basin, pour off the sulfur and butter, clean the sulfur and condense it, and then put it in the bottom of the pot. Take it and break it, put it in the cypress soup and cook it, wash it and listen to it.

The method of burning charcoal is to use an iron tube to put the wood into it and use fire to calcin it into charcoal ash... There is another method of burning charcoal. Putting wood into the ground with fire is not as good as burning the iron tube.

Several charcoal were built in the room to make a turnover. Each kiln was made of a large iron pot, and the amount was... Then add a pot and paste it with mud to prevent heat and external air from being discharged. Take it out after a day and night and use it for milling.

[Because the content is too complicated, the purification techniques of these gunpowder formulas will not be described one by one here.] In short, the purification of black gunpowder is not difficult. The difficult thing is that the ancients did not know the best method of matching black gunpowder.

Regarding the best ratio of saltpeter, charcoal and sulfur, a slight difference in power will be greatly reduced. Fortunately, Zhu Cixuan is clear about this.

Xia Dechao and his subordinates worked very well in the iron shop. Huge iron cages were forged. At this time, these iron cages were enough for use in Xicheng. The remaining ones would be able to make the iron cages needed in Beicheng in three days. Then, using a wooden tower crane to hang the iron cages onto the city wall, and everything would be completed.

At that time, Yizhou City was an iron bucket. It was a dream that Jiannu wanted to attack.

The soldiers all knew that the solidity of the city wall was a major event that concerns everyone's life. Therefore, everyone was trying their best. The soldiers who went outside the city to pick up stones, they tried every means to move all the stones they could transport into the city.

The soldiers of the blacksmith shop, the burning stoves of the ding-dangdang, the burning bellows of the bellows, the forged forging, and the pouring iron juice.

In the shed, there were even various jingling sounds drowning the voices of everyone. When a young man found Xia Dechao, Xia Dechao was waving the hammer in his hand and sweating heavily against the iron pieces in his hand.

"Xia Qianhu, Your Highness the Crown Prince is welcome!" The young master covered his ears and shouted loudly.

Xia Dechao turned his head, and the hammer in his hand did not stop: "What?"

"Your Highness, please come over Xia Qianhu." The young master competed and beat, and Xia Dechao finally understood.

He handed the hammer in his hand to a shirtless soldier beside him, took the water scoop from the water tank next to him, scooped a scoop of water randomly, and drank it all in one ox drink. Then he touched his lips and shouted, "Your Highness, Prince, go."

The young master nodded, walked out of the straw hut with one foot deep and one foot shallow, and led Xia Dechao to find Zhu Cilang.

Seeing Xia Dechao, whose face was dirty and whose face was darkened, Zhu Cilang nodded at him: "Thank you for your hard work, Xia Qianhu."
Chapter completed!