In accordance with Su Xiaocai's drawings and requirements, the carpenter and mason used pots, water tanks, bamboo pipes and other materials to transform a machine for Su Xiaocai to purify sulfur and saltpeter......

The formula of the powerful black powder is already known to Gao Yu now, but after all, the saltpeter and sulfur they use are not so pure, which can also weaken the power......

Su Xiaocai plans to purify this thing and use it to increase its power. Of course, the recipe for this thing can't be known to everyone, and now it's enough for the mountain to know it yourself.

So when he asked him to purchase things, he also purchased some other sundries, such as lime, arsenic, flint, dansha, etc., all of which were sent to this operation room, and he handled it himself, so no one knew what the black powder was configured!

Of course, these things don't come that quickly, so they've been making this kind of giant crossbow these days, although there is no bowstring......

In the purchase list this time, there is no beef tendon, because this thing is not easy to buy in the Great Song Dynasty, and because it is made of bowstrings, it is forbidden for people to purchase it...... Therefore, Su Xiaocai purchased silk!

He knew that the mechanical strength of silk was actually very high, but because it was too thin, many people had not noticed this feature in recent years, so few people used this thing to make bowstrings......

Time passed, and by the fifth day, the news had already come to a lot......

Today it is said that the officers and soldiers are assembled here, and tomorrow it is said that the officers and soldiers are assembled there, and the army and regimental training everywhere are also being assembled!

In general, now it seems to be in ambush on all sides, the real wind is blowing and the clouds are flying, thunder and lightning are flashing, but there is no rain!

"It is said that the Liang family is now in charge of everything, and the financial resources and power of the family are mediating, banqueting the general, giving gifts in large packages, and the six hundred miles between Tokyo and the urgent transmission of more than the imperial court...... Under their mediation and pressure, it is certain that a large army from all walks of life will soon attack us......"

"Whoever is arrogant, I will give him some color...... The purchased things, presumably will arrive in the next two days, and the first batch of thunder will be made, so we will try it in the Liang family's compound......"

Just as he was saying this, someone from outside came to report that something had been sent from the mountain and was moving back and forth......

"Wood, are you one of us?"

"Nature is our people!"

"It's actually sent to our bandits' den, but we can't let the court discover the secret between the Five Elements Gate and the bandits, otherwise there will be endless troubles......"

"Don't worry, boss!" Wood said, "Those who sent these things are bandits......

"Oh?"

"Since they came, they will never go back! The head is here now, and now that the big war is imminent, it is natural that a large number of masters will come here to protect you!"

"I've got a gun!"

"If the master has a gun, it will be even more powerful!" Wood laughed.

Mu is young, but as he said, his father has held him in his arms since he was a child, and he has trained him to be a master over the years!

Su Xiaocai gave him one of those revolvers, just like he said, the master's hands are steady, the weight is light, the recoil of the revolver is so big, the wood holds it with one hand, and after grasping the essentials of the action, he fired a few shots, and then each shot was very accurate......

In the end, he insisted on occupying two revolvers for himself, but he could shoot left and right, and the bullet was not missing...... That's talent!

"Alright! Don't worry about it! I'll repeat to you, I can't make guns or bullets! It's not as good as a burning stick after the bullet hits, so save a little in the future!

Not much, I really don't have much, not much!

Now let's take someone and hurry up to move things!

I need all these things urgently, and I have moved them into the operation room of my big warehouse that has been renovated......"

Some of the things were moved, Su Xiaocai saw the new disciples of the Five Elements Sect, and those people told him that there were actually a lot of things, much more than what was written on the list, but now there are checkpoints on the road, and they can't be transported all at once......

It would take a lot of silver to open these joints at one time, so the rest of the things will be shipped in the future, and it may be finished in five or six days in a row......

In this way, there will be more than 100 people who have come before and after......

It's time for food to be limited now, not even a single grain can be brought in, and I don't know if there is enough food for so many people to come to the cottage?

Su Xiaocai said with a smile: "I don't have food or clothing, our own enemies send money, no guns and no cannons, we make them ourselves!"

Don't worry, if we really fight, we'll have everything to eat and drink......"

After the things were moved, Su Xiaocai entered the operation room and found that the craftsmen were very dedicated and built the facilities exactly according to their own design, of course, the key steps had to be assembled by themselves.

After some assembly, the heating equipment was ready, and Su Xiaocai asked for the blast facilities and charcoal used by the blacksmith, and began to purify the sulfur.

The sulfur purification method is to heat the sulfur-containing material in the heater, the heating temperature is more than 400 degrees, and the water vapor begins to be introduced, and the gas outlet valve is opened at the same time, and the gas conduction iron pipe will spray out the mixed gas of sulfur and water, and then the mixed gas is passed into cold water, the precipitated sulfur, and then dried, and high-quality sulfur is obtained.

The next step is to purify the nitre. The fire nitrate of this era should be made of nitrate and plant ash as raw materials. After the organic matter in the soil decays, nitric acid is formed by the action of nitrite bacteria and nitric acid bacteria. Nitrate combines with potassium, sodium, magnesium and other ions in the soil to form nitrate. That's how the nitrates in nitrate come from. Nitrate soil is generally found in toilets, pig and cattle pen houses, old walls in courtyards, cliff edges, caves, and ground that is not easily washed by rainwater. The nitrate soil is moist, not easy to dry, and turns slightly purple-red after being exposed to the sun. A good nitrate will spark when placed on red-hot charcoal. The main principle of extracting potassium nitrate from nitrate soil is to use potassium ions in plant ash to replace sodium ions in nitrate soil to generate potassium nitrate. In addition, the carbonate ions and sulfate ions in the plant ash combine with the calcium and magnesium ions in the nitrate to form insoluble salts and precipitate, thereby removing impurities such as calcium and magnesium. Of course, the nitrate itself also contains potassium nitrate, and finally the difference in the solubility of various salts is used to control the temperature and concentration to crystallize the potassium nitrate from the mixture.

Of course, the ancients did not understand this, but this did not prevent them from using waste such as wall soil to make fire nitrate.

Of course, there is a large amount of natural saltpeter in the northwest region, and now these gray and earthy fire nitrates in front of Su Xiaocai's eyes may be saltpeter transported from the west.

But in any case, the fire nitrate made by people at this time contains too many impurities, which does not meet their own requirements, and they have to be purified.

Su Xiaocai first grinded these saltpeters, then dissolved them in water until they were no longer dissolved and saturated, and then began to heat... Then the powder is added and stirred until it is dissolved, and then the solution begins to cool, and pure potassium nitrate is precipitated from the solution, filtered, washed, and dried......

Although the previous steps were extremely time-consuming and labor-intensive, he didn't plan to let outsiders know that this thing was too powerful to be mastered by anyone compared to the weapons of this era! So, he did it all the way!

A person was busy until the evening, and only took time to eat some dry food and drink some rice wine in the middle. In the evening, a large pile of black particles was finally piled on the dry stone slab, in order to absorb water and keep the gunpowder dry, Su Xiaocai used some quicklime and piled it around the house......

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Sogou