Prime Minister's Mansion, Study.

The grandfather and grandson sat opposite each other.

Faced with Lao Cao's inquiry, Cao Bin did not rush to answer.

He began to calculate in his mind how much it would cost to make a bomb.

Nitrate can be scavenged from the lower layers of old earthen walls, where humans and animals defecate, and the cost is negligible.

Grass ash and charcoal are also very simple, and they can be used to burn firewood, and the cost is also very low.

The key is sulfur!

It's not a good thing.

Nowadays, there is no artificial sulfur, and only natural sulfur mines can be found.

But it is clear that the sulphur mines in the Central Plains are too scarce.

Cao Bin remembers that he had read a geological report on a sulfur mine in his previous life: there was a sulfur mine in the area of Mankou in Xin'an County, Henan Province, containing 45 percent sulfur and about 472,500 tons of pure sulfur reserves; there was one in Xuanhua Xiyaogou in Hebei Province, containing 25 percent sulfur and containing 22,500 tons of pure sulfur; Xuanhua Wangjialou pyrite mine had a sulfur purity of 25 percent and pure sulfur reserves of 97,500 tons; Luojinggou pyrite mine in Leshan, Sichuan, containing 30 percent sulfur and 36,000 tons of pure sulfur reserves; in addition, there were also a large number of sulfur mines in Chenxian County, Hunan.

But this is a geological report two thousand years later, with the current means and technology, how difficult it is to dig out these sulfur mines!

Nowadays, sulfur is usually used as a medicinal material, and the stock is very small, and it can only be collected in large quantities by mining.

Therefore, he could not estimate the cost of each bomb at all.

It is also extremely difficult to produce bombs in large quantities as Lao Cao said.

"Father, my grandson has carefully estimated, and it is really difficult to produce on a large scale."

After being silent for a long time, Cao Bin raised his head, shook his head under Cao Cao's expectant gaze, and said.

"Huh? Why can't it be mass-produced, you can come to the Father."

When Cao Cao heard this, he frowned and asked eagerly.

Could it be that the budding ambition in his heart was about to be stillborn in an instant?

"Father, the main ingredient of the bomb is synthetic black powder, and my grandson is made of potassium nitrate, stone flow yellow, and charcoal mixed according to a certain proportion!"

As Cao Bin spoke, he took out a packet of black powder from the wooden box and put it on the table to show Lao Cao.

"It's this thing, when ignited, it can emit a lot of heat, and when it is placed in a sealed container, it can emit a powerful explosive impact."

Pointing to the black powdered black powder on the table, he said to Lao Cao, "Everything else is simple, the key is that this stone flow yellow is not easy to find, so Sun Er can't estimate the cost of it, and I don't know if it can be produced on a large scale."

In the book "Fan Zi Jiran" written by Fan Li in the Spring and Autumn Period, there is a record of sulfur, which is written as "Shiliu Huang"!

After that, in the "Shennong's Classic of Materia Medica" in the late Western Han Dynasty, it was also classified as a kind of medicinal material, written as "stone sulfur".

"Oh? Stone flow yellow? Where can I find it?"

Cao Cao hadn't heard of this thing, but it was a relatively isolated thing, and it was generally used as a medicinal herb.

But it doesn't matter if you don't understand, you just need to figure out where it is.

"Shiliu Huang is a natural ore, as far as my grandson knows, there is a Xin'an County in Hongnong County under Sili Prefecture, and there is a ferry on the south bank of the Yellow River seventy miles north of the county, and there is a Shiliu Yellow Mine nearby."

Cao Bin pondered for a moment and replied, "If this mine can be found and mined, it will be enough to solve the problem of not being able to collect raw materials."

He calculated that the sulfur mines in Xin'an County, Henan Province were the closest, and the rest of the mines were either in Sichuan or Hunan, none of which were under Lao Cao's rule.

Moreover, the sulfur content of this mineral deposit in Xin'an County is sufficient, as high as four or five hundred thousand tons.

As long as it is mined, nothing else dares to say, and it is enough to bulldoze the bomb raw materials in the world.

"Sili Prefecture is located at a ferry port seventy miles north of Xin'an County in Hongnong County... I wrote it down."

When Cao Cao heard this, he didn't care why his grandson knew that there was a stone flow yellow mine here.

"If this mine is mined, will it be possible to produce bombs on a large scale?"

He pondered, memorized the name of the place, and then asked.

"Hara

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If you have enough, you have to find a quiet place that no one disturbs you to use as an arsenal, preferably in the middle of nowhere, in the deep mountains and old forests."

Cao Bin wrenched his fingers and said to Lao Cao one by one: "The most important thing is that the eldest father must send a large army to surround this place, and the formula and production of the bomb must not be leaked, otherwise there will be no peace in the world."

"In addition, the craftsmen had to be trained on how to make black powder, how to make fuses, how to fire ceramics, how to make bombs, and most importantly, safety issues."

"Once the factory is ready and the craftsmen are trained, it's almost time to mass-produce bombs."

The reason why he wanted to find a remote place was that Cao Bin was afraid that an accident would happen, and then the fun would be great.

For example, in the sixth year of the Ming Dynasty's Apocalypse, there was an explosion of a powder magazine, which was known as the explosion of Wang Gongchang.

According to historical records, the incident caused a radius of 750 meters, an area of 2.25 square kilometers, and a huge number of casualties of more than 20,000 people.

According to later estimates, the power of the explosion was about 10,000 to 20,000 tons of TNT equivalent.

The loud sound caused by the explosion spread visions such as hundreds of miles, darkness like night, turmoil in the house, and clouds like Ganoderma lucidum.

The reason for such a large number of casualties is that Wang Gongchang was placed in Beiping City and did not pay attention to safety issues.

Therefore, Cao Bin immediately thought of the issue of security.

If you are not afraid of 10,000, you are afraid of what happens, and safety comes first.

"In that case, you're going to have to mobilize a lot of people..."

When Cao Cao heard this, he thought about it, and was a little embarrassed.

It makes sense to mobilize troops to protect it, but the key is that many craftsmen are needed.

From Cao Bin's words alone, he could tell that even if it was to make bombs, it was necessary to divide them into various departments and work together with each other.

Some make black powder, some make fuses, some fire ceramic shells, and some make bombs.

Not to mention, someone needs to collect the raw materials and rough them up.

For example, collecting rockflow yellow ore, burning plant ash, burning charcoal, boiling nitrate, and so on.

He roughly calculated that at least a thousand craftsmen would need to be mobilized, which would be a bit of a problem.

"Has the eldest father considered recruiting only a small number of craftsmen and recruiting more young people to cultivate?"

Hearing Lao Cao's words, Cao Bin thought it was true and suggested.

After all, this is the Three Kingdoms era at the end of the Han Dynasty, not the previous life with a complete industrial base.

Nowadays, there are four classes of agriculture and commerce, and the status of industry and commerce is the lowest.

It's easier said than done to gather thousands of craftsmen at once.

It's better to recruit some skilled workers first, and then some apprentices, so that they can learn and do at the same time.

"Oh? That's a solution, that's it."

When Cao Cao heard this, his brows stretched instantly, and he said with a final word.

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