Pei Shaoqing sighed in his heart.

Now, there are some tricks, because he has not systematically learned the sand turning and casting process, and does not know how to remove the pores generated during casting.

However, if these pores are not removed, the strength of the cannon barrel will not meet the requirements.

You can't increase the wall thickness of the cannon barrel to 150 cm or even more than 200 cm, right?

If this is the case, the weight of the cannon will be extremely terrifying and will drag down the logistics.

Before coming, Pei Shaoqing thought of making the cannon barrel as thin as possible, reducing the weight, preferably controlling it below one ton, so as to ensure the maneuverability of the cannon.

However, with the current casting process, it is obviously not possible.

Lu Shisan's face was not good either, and he looked at Pei Shaoqing with some anxiety.

Pei Shaoqing then comforted Lu Shisan: "Old Lu, don't care. It's not so easy to invent new weapons. It must require countless experiments."

"As the saying goes, failure is the mother of success."

"Only if you fail too many times, you can finally succeed."

"Si Cheng." Lu Shisan said gratefully and ashamedly, "You are disappointed."

"I'm not disappointed." Pei Shaoqing said, "If you are defeated by one failure, then I'm really disappointed."

"Don't worry, Si Cheng, you will never be defeated by failure." Lu Shisan pointed to the wreckage of the cannon barrel and said, "Si Cheng, look, the reason why these two cannons exploded is because of these small holes."

"We just need to find a way to remove these small holes and do it right."

Pei Shaoqing nodded happily and said, "Lao Lu, how do you think these small holes come from?"

"This is not very good." Lu Shisan pondered, "However, Xiao Lao suggested that Si Cheng second several blacksmiths who cast bronzes from the supervisor, and they should know the truth."

"Are you going to be a supervisor?" Pei Shaoqing shook his head and said, "But I don't know the supervisor who will be a supervisor."

In fact, it is not a problem to know whether to know the supervisor who is the supervisor or not. The problem is that Pei Shaoqing does not want to be related to the supervisor, because the supervisor is used to make weapons and armor. Once the guard and the supervisor are related to the supervisor, it will inevitably attract Wu Zetian's attention. At that time, the secret of the firearms could not be kept.

Pei Shaoqing never thought about keeping the secret of keeping the firearm.

But at least, Wu Zetian cannot know now.

Otherwise, Wu Zetian's order alone would make the guard and capture officer exhausted.

Imagine if Wu Zetian knew the secret of the firearm, would she draw the artillery team of the Shouji to the northern border, North Korea and even the Tubo battlefield? At that time, the Shouji will be ordered or not?

So the best choice now is to hide it from Wu Zetian.

Pei Shaoqing said now: "There are many blacksmiths in the folk who can cast bronzes. I will send someone to find you a skilled coppersmith. Then you can think about it together."

"Now." Lu Shisan replied with his hands crossed.

Then, Pei Shaoqing and Lu Shisan tried the fire thunder again.

Fire thunder is actually a land mine. The noise is quite loud when it explodes, but the killing effect is average.

Before nitroglycerin was developed, weapons such as grenades or landmines were not very effective because the charge was small and the lethality was too weak, and the charge was too heavy and it was inconvenient to use.

However, fire thunder is still quite powerful for defense.

Pei Shaoqing said now: "Lao Lu, first make 100 rocket cars, and prepare ten bases for the Rockets."

"Base number?" Lu Shisan said in a confused look on his face, "Si Cheng, what is the base number? What are the ten base numbers?"

Pei Shaoqing said oh, and said again: "A cardinality is the number of rockets launched once."

"Oh, that old man understands." Lu Shisan said suddenly, "The ten bases are nine hundred thousand rockets."

"Yes." Pei Shaoqing nodded, "There is also this fire thunder, just make two thousand pieces first."

Speaking of this, he said, "But there is no hurry. During the next period, I will make fireworks first, because the winter solstice will come in two months."

"The Winter Solstice is the Lantern Festival."

"My child will be born by then."

"I want to prepare a special meeting gift for her."

Lu Shisan was confused again and asked, "Si Cheng, what are fireworks?"

Pei Shaoqing turned around and said to Shangguan Wan'er, "Wan'er, give the drawings I drew to Lu Shucheng."

"Here." Shangguan Wan'er responded with resentment, immediately took out a drawing from her carry-on leather bag and handed it to Lu Shisan.

After seeing it, Lu Shisan said, "Si Cheng, isn't this just a firearm? It's just that the cannon barrel is made of rolled paper, not cast iron."

"It's almost the same."

"It's just that the projectile is an empty bullet."

Pei Shaoqing said: "And this is just a preliminary idea."

"There are definitely many difficulties in actual production. During the trial production process, if you come up with a better idea, you can also try it boldly."

"Here." Lu Shisan said with his hands.

After checking the work of the Lux 13 Firearms Bureau, Pei Shaoqing came to Niu Si's cotton field again.

I saw that the cotton field was covered with snow, but even on such a heavy snowy day, Niu Si was not idle and was still loosening the soil and fertilizing the cotton field for sowing the next year.

"Old cow." Pei Shaoqing shouted, "Stop busy."

"Si Cheng?" Seeing that it was Pei Shaoqing, Niu Si quickly crossed his hands to greet him.

After seeing Li, Niu Si said with shame: "Si Cheng, the harvest of cotton wool is much less than I expected, and I only collected more than 6,000 kilograms of cotton wool."

“So much less?”

Pei Shaoqing said in surprise: "Why is this?"

"Because Xiao Lao is talking about the weight of the seeds."

Niu Sidao: "But the cotton wool that Si Cheng wants is peeled from the seeds, so it's lighter."

Pei Shaoqing nodded lightly and asked again: "Where are the harvested cotton wool and cotton seeds? Take me to see."

"Si Cheng, please come with my elders." Niu Si finished speaking, and took Pei Shaoqing to a warehouse in Cuiwei Palace. When he opened the warehouse door, he saw a bag of tightly pressed cotton wool placed in the warehouse.

Niu Sidao: "Si Cheng, please see, these cotton bales are one hundred kilograms, a total of sixty-one bags."

"Very good." Pei Shaoqing said, "Where are cotton seeds, how many? How many acres can you plant next year?"

"The cotton seeds are not here, they are stored in the cellar." Niu Sidao, "The weight of cotton seeds is about 9,000 kilograms, and you can plant about 1,500 acres."

"Can you only plant about 1,500 acres?"

Pei Shaoqing frowned and said, "This is a bit rare."

Niu Sidao: "If Si Cheng thinks it is too small, he can plant it more thinly. He can plant about 2,000 acres, and the yield of cotton per mu will basically not be much different."

"Okay." Pei Shaoqing said, "Old Niu, I will send a few more gardeners to set up a cotton seed department, and you will serve as the head of the cotton seed department."

"ah?"

Niu Si said dumbfoundedly: "Si Cheng, I'm afraid this is not suitable, right?"

I think he is just a gardener and a lowly person. How can he become an official?

"I said it's appropriate. In the guard and catch the sect, I have the final say." Pei Shaoqing said, "Old Niu, just be at ease as your guard and catch the cotton seed department head, and don't worry about anything else."

"Your Cotton Seed Department has two main tasks."

"One is to improve cotton seeds and cultivate higher yields of cotton varieties."

"The second job is to guide the mountaineering people in Qipan Mountain District to grow cotton."

"In two years, I will let the princess plant cotton in all 10,000 households in Qipanshan."

"Here!" Niu Si blushed and agreed with his hands crossed. At this moment, he just wanted to sell his life to Pei Shaoqing.

Pei Shaoqing said to Shangguan Wan'er again: "Wan'er, remember it."

Shangguan Wan'er quickly took out the soft copy and a special charcoal pen.

Pei Shaoqing said: "After returning to Chang'an this time, there are a few things to be prioritized."

"The first thing is to set up a cotton spinning workshop in Andefang, which specializes in spun cotton bat into cotton thread."

"The second piece is to set up a weaving workshop in Andefang, responsible for weaving cotton thread into cotton."

"The third piece is to set up a ready-to-wear workshop in Andefang, responsible for making cotton cloth into cotton coats."

"The fourth item is to recruit about ten skilled blacksmiths, and those with experience in copper casting are preferred."

"The fifth piece is to find and hire a shopkeeper from the textile and garment shops in Chang'an City."

"The sixth thing is that you have recruited more than 30 students from Imperial College and entered the various workshops in Andefang for internships. Have you recorded them all? Do you want me to say it again?"

"I've written down all."

Shangguan Wan'er said.

...

No words all night.
To be continued...