Caidao Town is as its name suggests, it is best at using kitchen knives.

Because there is a lot of iron here, at least compared to other places, the amount of iron here is quite large. They can process the iron ore slag over and over again to extract some of the remaining iron.

The blacksmiths in the town smelt the iron and then hammer it through layers of hammering to make handmade kitchen knives. The quality is hard, light, thin, strong and durable.

Like later brands, these were quickly spread and brought a lot of business here.

Therefore, at least half of the families are engaged in kitchen knife-related business these days, and there is a red-hot iron furnace at the door of every household. Slag is put into it, and after continuous quenching, it is slowly hammered out.

Perhaps because the name is impressive enough and the business is also laborious, the blacksmiths here have bare upper bodies, strong muscles, and look tough.

Lin Jiuxi found a shop that produces round-handled kitchen knives.

Blacksmith Li made a promise that he had no second thoughts.

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If people in later generations see this drawing and put it together, they will easily understand that this is a design drawing for a simple fire system.

Lin Jiuxi was unwilling to accept this fact.

But Lin Jiuxi really didn't want to go to the toilet to dig saltpeter. Besides the toilet, the only place where he could find the most raw materials was the fireworks shop.

I handed them the same blueprint and asked if they could make it. The conclusion I came to was the same.

“Is it difficult? You just need to make them into round tubes, and the rest of the small parts into squares, and then use a small iron saw to cut them, and finally polish them.” Lin Jiuxi felt that he had tried his best to simplify the shape of the Fire Master to the point where it could not be simpler.

Lin Jiuxi heard this word from a custom-made merchant when he was custom-making a pair of gold earrings.

The agreement stipulated that Lin Jiuxi had to pay him one hundred gold leaves every year, which was an absolutely high price. But he must not expose Lin Jiuxi's method, otherwise...

Compared to the gun she was used to, this thing looked far inferior.

There are still some people who buy fireworks and use them as gunpowder, which has caused many explosions. So officials should pay attention to this when governing.

Lin Jiuxi was not idle either. She found several blacksmith shops with the best reputation in the town and the most furnaces in front of them.

You have to know that the earliest invention of gunpowder came from alchemy, and medicine is the closest to alchemy. As a person from the Holy Medical Valley, Lin Jiuxi certainly knows this very well.

So she just found the blacksmith who had agreed at the beginning and signed a contract with him with a confidentiality agreement.

Lin Jiuxi said very wisely: "There is enough money."

But the blacksmith in Caidao Town couldn't understand it, so he told Lin Jiuxi directly: "This is too difficult."

The blacksmith stopped arguing with his rich employer and said, "I'll go ask other people."

"I'm not here to fight with knives. I need you to help me make these things." Lin Jiuxi took out the drawings he had planned.

Lin Jiuxi kicked and broke the tree trunk that had been growing in front of his house for three years.

If it is so difficult, then how did the people who first made the fire tube make a round tube? In his confusion, Lin Jiuxi suddenly remembered a word he used when he customized the jewelry.

"That's bamboo cut in the mountains, and it doesn't have to be evenly thick or thin." That's what they told her.

Lin Jiuxi spent a lot of money to buy a lot of gunpowder raw materials in a fireworks shop. In order to cover up his tracks, he directly bought a not-so-famous fireworks shop.

Not only round iron pipes, but also small parts can be made.

After the temperature drops and the shape is fixed, what you get is the shape made by the wax model.

There are many round iron pipes and strange-shaped objects on it.

Lin Jiuxi still remembered the extremely famous Zeng Yihou chime bells that the man had boasted to him about, which were also made using this method.

They use big hammers to make things, one hammer at a time, and most of their products are flat surfaces like kitchen knives and scissors.

The blacksmith told her: "You want the round tube to be of uniform thickness and glued together without any gaps. This is not easy."

"I heard that some of you can make kitchen knives with round handles? Isn't this similar?" Lin Jiuxi felt strange.

The two of them put Lin Jiuxi's method into practice, and the results were indeed very good.

The method is also very simple, just use burning wax to make the molds you want first, and then put them into sand powder with a higher melting point.

There is no way to hammer out an iron round tube in this way. It must first be hammered into a flat plate of completely uniform thickness, and then a method can be found to roll it into a round tube.

As for the gunpowder in the nest, that is not a problem for Lin Jiuxi.

After making the overall part of the fire system, Lin Jiuxi then asked him to make the sub-nest - a gunpowder bullet, which is equivalent to a bullet.

The accuracy of the chimes is no smaller than the round tube of the fire tube she required, so in theory there is no problem in using it for manufacturing.

As long as your thinking doesn't slip, there are always more solutions than problems! Lin Jiuxi didn't plan to fully expand the method. Even if he wanted to popularize it, he had to wait until Nangong Jing completely took the throne.

The main component of sand is silicon dioxide, which has a melting point of over 1,600. The melting points of gold and silver are not that high, so pouring molten gold and silver into the sand will melt the beeswax.

In this way, we can purchase more raw materials more openly. Otherwise, such a large amount of raw material income will easily arouse the vigilance of others.

Lost wax method.

After several days of hard work and spending a lot of gold leaves, Lin Jiuxi finally got the simple fire system he had longed for.

Although it is not a little bit different from the high-tech thermal weapons commonly used in his previous life, it is a result of centuries of thermal weapons development history.

But when he got this heavy fire tube in his hand, Lin Jiuxi still felt like tears welled up in his eyes. This was the beginning of the era of hot weapons!

Lin Jiuxi was excited and pulled the trigger.

Then he instantly threw the fire in his hand away.