I came all the way over, but I told people that I had no money to buy firewood, so I didn't want to have this face? But if I really wanted to open the furnace, Tianyou really didn't have money to buy materials.

Kuroko has already said that he will not be charged a rental fee, but you can't let the family out of the materials, right? Tianyou now feels that he is in a bit of a dilemma.

I was hesitating here, but I didn't expect the old man to move quickly, and he had already begun to add firewood to the stove. Tianyou subconsciously opened his mouth and shouted "Don't", but the old man was mistaken, and smiled politely: "It's okay, I'm idle anyway, I'll give you a shot." Kuroko's friend, what's the point of doing a little favor?"

"I'm dizzy! I'm not polite to you, I can't afford to use this stove!" Tianyou felt bitter, but he couldn't say, "I'll come by myself, old man!"

Anyway, the furnace has already been opened, let's light the fire first! Tianyou really can't help it, and it's impossible to stop at this time. The Kuroko guy was obviously not the kind of master who was good at observing words and colors, and immediately began to help excitedly, and after a while, the entire stove was ignited. The huge chimney at the end of the centipede furnace began to emit black smoke with sparks.

Tianyou simply didn't think about the money anymore, or he had already thought about it, so he would mortgage the worry-free bag here, and go back to Yingying to settle the account and then repay the money. Now he finally knows how harmful triangular debts are, and he is in the rhythm of being cheated and bankrupt!

Although they had decided to make things first and then think about anything else, Tianyou found that he still thought things simple, because after the fire was raised, they were stuck in a long wait.

The temperature of the furnace rose much more slowly than expected.

All the mouths of the centipede furnace are equipped with flaps, and Tianyou constantly opens the furnace mouth to observe the temperature of the flame, which is a person who can see that he is too anxious.

The old man looked at him as if he was in a hurry, and said comfortingly: "Don't worry. This stove is slow to catch fire, and it will be good when it is hot. I had just sealed the furnace when you came, and it was not yet cold, and it would soon be hot. Usually I start to light a fire in the morning, wash up, eat and drink, wait for everyone to arrive, and then wait for another hour to go to work. You're already fast. ”

When Tianyou heard the old man's words, he suddenly thought of something.

"Brother Black. ”

"Hmm, what's the matter?" Kuroko didn't know what Bai Yu was telling him to do.

Tianyou thought for a while and asked, "If there is such a thing, it is very useful to the store, I wonder if Brother Hei can buy it on behalf of the store?"

"What's wrong with this?" Kuroko asked completely puzzled, "Since it's a useful thing, if you buy it, why can't you call the shots?"

"In that case, it's easy to do. Tianyou said: "I happen to have a kind of technology here, and the things I make are worth ten thousand dollars for your workshop." I wonder if Brother Hei can call the shots?"

"Wanjin?" Kuroko didn't think too much about it, and he panicked when he heard the price. 100. The things in the Bingfang are not cheap, but the ten thousand gold is too exaggerated. "This ...... You may need to talk to your owner. ”

"It's okay, Brother Hei can help me contact me. "This store is Lu Meng's, the little girl has been doing well with Tianyou along the way, Tianyou doesn't think she will refuse her proposal, after all, this matter is actually Lu Meng's advantage.

After Heizi promised to go back to Lu Meng and ask, Tianyou didn't delay any longer, and directly asked Heizi to help find tools, and then made a tool on the spot that almost everyone in later generations knew - bellows.

Don't underestimate this tool with a simple structure and almost no structure, it is its emergence that has allowed mankind to enter the era of large-scale use of iron tools, because the bellows can greatly increase the furnace temperature, and before entering the Iron Age, the biggest problem that restricts human iron smelting is that the furnace temperature cannot be raised.

The first metal used by humans was not iron, but copper, or bronze, that is, copper-tin alloy.

The hardness of bronze in the correct ratio is actually more than that of pure iron, and the corrosion resistance is much stronger than that of iron, but iron is still a more important metal than copper for two specific reasons. One is ferroalloy, that is, steel has a higher hardness than bronze. Second, there are a lot of iron ores.

While hardness is also important, the second point is actually the most important. Copper reserves are too low to be applied on a large scale, while iron reserves are much larger and widely distributed, which is conducive to large-scale applications.

However, despite the wide distribution and large reserves of iron ore, mankind initially chose to use bronze instead of iron on a large scale, and the reason for this was the difficulty of smelting.

The melting point of copper is 1083.4 degrees, and the tin is even lower, and the bronze after mixing the two can be melted at only 1,000 degrees, and the difficulty of smelting is relatively low. But iron is different. The melting point of iron was as high as 1535 degrees, and in ancient times when there were no electric furnaces, it was very difficult to heat a thing to more than 1,500 degrees, so the ancients had to use scarce bronze to make various utensils and weapons.

The centipede furnace in front of Tianyou is already a very high-end smelting equipment, which not only uses a series combustion chamber to save fuel, but also increases the temperature of the front furnace, and more importantly, it has a low-temperature furnace mouth specially used for annealing, normalizing and tempering.

Such an advanced smelting furnace is among the top among the ten countries, but in Tianyou's view, it is still backward, and this backwardness is not even because of the lack of high-end technology, but purely because of the incompleteness of the basic theory.

First of all, the fuel used for this centipede furnace is firewood instead of charcoal, which is no wonder that the temperature can be high.

Secondly, the wall of this centipede furnace is too thick, which is said to be for heat preservation, but in fact it causes the trouble of heating up. In fact, the best way to insulate is not to thicken the furnace walls, but to use hollow bricks. Air is the best thermal insulation material, as long as the convection of air is limited, the heat loss rate of air is actually very low by heat exchange alone.

Thirdly, that is, where God has decided to improve, accelerants.

The centipede oven uses a tandem structure, running from head to tail, with a chimney at the end. The hot air rises and is naturally discharged down the chimney, and then creates a negative pressure in the furnace body, drawing fresh air from the outside into the furnace to support combustion. To put it bluntly, this process is natural inhalation.

No one in this world may feel that there is anything wrong with this, but Tianyou is not a person from this world, so of course he will not be satisfied with ordinary natural inhalation. Of course, a furnace cannot play turbocharging like a car engine, but it is still necessary to add an active air intake, and this additional equipment is - bellows.

Because the structure of the bellows is too simple, neither need machining accuracy nor pay attention to any air tightness, as long as the air leakage is not particularly serious will not affect the use, so Tianyou almost three or two times with a wooden board nailed out of a simple bellows.

Originally, the correct way to do it, there should also be a simple seal between the bellows and the fire, but Tianyou only used it temporarily, and he didn't pay attention to it so much, so he asked Kuroko to help lift the bellows to the mouth of the furnace and put it away, and he planned to try it.

Neither the sunspot nor the old man knew what Tianyou was going to do, so they could only watch dumbfounded. When Tianyou pulled out the bellows lever, the two didn't see any change, and they were puzzled, when they saw Tianyou suddenly push the lever back. This time it was terrible, the eyes of Kuroko and the old man almost didn't pop out.

I saw that as Tianyou suddenly pushed the lever, a strong wind poured into the furnace, and then the entire furnace was fried. The cracks in the edges of more than a dozen furnace doors, which were not tightly sealed, were all spewing out flames, and the chimney at the end of the furnace instantly turned into a large torch, spewing out a burst of flames more than two meters high, like a large torch.

In the stunned eyes of Kuroko and the old man, Tianyou slowly pulled back the bellows lever, and then pushed it in again. This time it was even more terrifying than before, the flames from the edge of the furnace door had changed from orange-red to bright white, and the chimney at the end of the furnace was spewing flames more than a foot high, and in this dark night, almost the whole city could see the huge pillar of fire rising into the sky.

Because the centipede furnace is very large, Tianyou is worried about the lack of air intake, so the volume of the bellows is also very large, and his strength is beyond ordinary people, so the blowing volume of this bellows is quite scary. The centipede furnace itself is a hermetically sealed whole, and the gas entering the furnace mouth must be sent out from the chimney except for a trace of the furnace door. Moreover, the bellows blow in a cubic of air, which will intensify the combustion of the flame, which in turn will produce more heat. High temperatures cause the air to expand, so the cubic air pressed into the furnace will go out more than one cubic and be much larger.

This series of factors has caused such a terrifying blowing effect, but it looks scary, the temperature of the furnace is indeed coming up quickly, only twice, and the old man has put a wet linen cloth outside the furnace body before has begun to smoke, which means that the furnace body has been completely burned through, and it can start to make iron. It's just that now, how dare the sunspot and the old man let Tianyou burn it again!

"Little brother, little brother, quickly collect the supernatural powers! If you come here twice, I'm afraid this house will burn down together!"