The next day, seven o'clock in the morning!

Xing Feng and Ah Lian wore ordinary cotton clothes, and Duan Peng met in the west gate of the county seat, and under Duan Peng's leadership, they walked along the small alleys in the city all the way to Nancheng District.

"Brother Duan, is your friend reliable?" Xing Feng asked.

"Hey, don't worry, brother. He is a brother who has played with me since he was a child, and he loves to tinker with these things, and now he has opened a small workshop to make fireworks, and he must have what you want. Duan Peng said.

"That's good." Xing Feng nodded and asked no more.

After nearly 20 minutes of walking, Xing Feng and his party turned around in the alley, and finally came to an old blue brick courtyard house.

Duan Peng was their old acquaintance, and the black-faced old man who was guarding the door did not stop him, and directly let the three of them in.

As soon as you enter the courtyard, a strange pungent smell comes from the surface, which is the smell of sulfur, nitrate, stove soil and other items mixed together.

In the various rooms of the courtyard, it is also a busy green scene!

Some people are boiling yellow-brown goey things in large pig iron pots with a diameter of more than one meter, some people use hammers to knock large pieces of nitrate into small pieces, and then use stone grinding to crush the nitrate into pieces, and some people use black powder to make finished fireworks, and so on.

Looking at the scene of handmade fireworks in front of me, a word instantly caught the mind of Xing Feng - black factory!

The finished and semi-finished products are placed in a mess, and all kinds of raw materials are stacked in a mess, without any safety protection measures, which is completely the standard configuration of the black workshop.

However, these have nothing to do with Xingfeng, all he wants is black powder.

Although this fireworks workshop doesn't look good, the stock is quite sufficient, and Duan Peng came forward and talked to the boss here and his little hair.

The black powder urgently needed by Xingfeng was in hand, and there were more than 10 catties!

This kind of thing is a necessity for fireworks, and the amount of punishment is not much, so it is purchased together by the way.

On the way back to the inn, Xing Feng also deliberately went to the grocery store and bought five aluminum teapots the size of a casserole under the puzzled eyes of Duan Peng and Ah Lian.

With everything ready, Xingfeng returned to the third floor of the Joy Luck Inn, immediately closed all the doors and windows, and set about making the "Delay Explosive".

This thing sounds mysterious, but it's actually very easy to make!

Black powder is a violently burning substance, and the reason why it explodes is mainly due to the short-term violent expansion characteristic brought about by the ultra-high temperature at the time of combustion.

Grasp this point, and it will be very easy to make bombs.

The pot is filled with black powder, the spout is covered with a lid and sealed along the edges, and a lead is inserted from the spout to connect with the black powder in the pot.

Then use a "incense" that has been broken off a third and insert it into the spout as well, and tie the lead wire to the end below the incense so that the two are close together.

Finally, use some dry paper, mix some semi-wet loess, seal the spout, and fix the position of the incense and the lead at the same time.

After the five teapots are processed in the same way, the five ancient versions of the "Delay Explosive" are considered to be completed.

"Brother Xing, this thing is in the same way as a firecracker, can it really be ignited before it explodes after a long, long time?" Duan Peng, who witnessed the whole process, was confused and completely confused.

"Young Master, is this a big firecracker? It looks so weird and ugly. Ah Lian didn't think about it that much, according to later generations, it was a typical appearance association.

"Well, you're right, this is actually a super cannon bamboo, and its delay function lies in this incense."

Xing Feng smiled and said with great interest: "Let me ask you a question, do you know how many minutes it takes to burn incense?" ”

"Minutes? I don't understand this thing, I only know the time of a stick of incense, and I can run around our village. ”

As soon as Duan Peng finished speaking, Ah Lian answered: "Young Master, you told me before that there are 24 hours in a day, an hour is 60 minutes, and a minute is divided into 60 seconds, but how long this incense sticks, Ah Lian has not calculated." ”

"You have a good memory."

Xing Feng praised Ah Lian, turned to look at Duan Peng, who was talking about this novel method of calculating time, and said, "I use ordinary small incense, the time of this incense is about 30 minutes, and I only take one-third of it now. ”

"In other words, this cannon will explode after ten minutes after it is ignited, according to the speed at which you run, Brother Duan, you can come up five or six miles, which is enough for me to retreat to a safe distance."

"Of course, this is only my approximate estimate, how long it will take to explode, and you will know after tonight."

After listening to Xing Feng's words, Duan Peng seemed to understand a little, and said adoringly: "Brother Xing is worthy of being a person who has seen the world, and he understands more than me, a mud leg. ”

"It's just a little trick, don't take it seriously, we're going to start the action tonight, come, let's take a good count and see if there are any mistakes."

After finishing speaking, Xing Feng took out all kinds of intelligence materials recorded before, put them on the table and spread them out, and Duan Peng and Ah Lian made a final check on tonight's action plan.

……

Five o'clock in the morning!

Heyuan County, which has no modern lighting equipment, is plunged into quiet darkness.

"Squeak~"

The back door of the Xifu Inn opened gently, and a tall figure wearing dark strange clothes and carrying a large cloth bag quietly walked out of the back door.

Immediately afterwards, a man in an ordinary cloth coat and a girl in an ordinary cotton cloth robe, carrying luggage and a wooden box, also walked out of the door.

After whispering a few words at the door, the tall and strong man in black walked into the small alley on the side and walked towards the arsenal more than 100 meters away.

The remaining men, one woman and one man, walked to the east gate, less than 2 kilometers from the arsenal.

These three people are none other than Xing Feng, Duan Peng and Ah Lian, who took advantage of the dead of night to carry out their actions!

The human body is born with a biological clock, and the most sleepy time of the day is when the dawn is approaching, and it is at this point in time that the deepest sleep is when sleeping.

And at this point in time, in the winter season, it happens to be four o'clock when the stars are rising, and five o'clock is the stage when night and day alternate.

Xingfeng chose to act at five o'clock, which is what he likes is that once people are sleepy, their attention will begin to be distracted, and their vigilance will be greatly reduced, which will bring convenience to their actions.

Soon, Xingfeng passed through several small alleys and came to the high walls of the arsenal!

Compared with the heavy security before day and midnight, the vigilance of the sentry door in the arsenal at this time has been reduced by more than half.