After Buck said this, the other slave orcs scratched their heads, they all worked in the blacksmith shop, and only understood sand and salt and high-temperature calcination, and when Buck talked about blowing air on hollow iron pipes, they entered the knowledge misunderstanding and were confused.

"Lord Allen, how do you blow the air, do you blow it with your mouth?" The slaves subconsciously asked Alan.

They are not novices, and they know that Eren has a strong teaching ability, and their first thought after having a question is to ask Alan, and if they can't ask, they will ask the orcs who are one level lower than Alan.

Buck heard the slave's question and immediately realized that his opportunity had come, and as long as Alan couldn't answer, he could behave about it.

However, things were not as he thought, and Alan nodded: "Yes, blow with your mouth." ”

Buck was surprised, he didn't expect Alan to know the hollow iron pipe blowing method!

"Guess, definitely guess, Alan can't possibly know." Buck continued to comfort himself inwardly.

Allen's mouth did not stop, and further revealed:

"The hollow pipe blowing method requires a very thin iron pipe, and you can experience this method later.

The specific operation step is to dip one end of the iron pipe into the sticky liquid glass, put your mouth close to the hollow iron pipe, blow a big breath, and then you will find that the liquid glass has been blown into a round jar. ”

This is the core secret of the glassmaker, and it is rarely divulged to outsiders unless they have the right to have money.

Buck was so shocked that his jaw couldn't close, and his heart said it couldn't be.

But then I think about it, isn't Eren exactly the kind of person who has the power and the rich?

Buck returned to his normal expression and nodded silently in agreement.

After Allen said this, he added: "But this is not the point of today, I said that I will bring advanced glass making methods, and I will not use manufacturing methods that are behind the times." ”

"Lord Allen, the glassmakers in Southbank are trying to find new materials to enhance the transparency of glass, but it's too difficult." Buck shook his head slightly, not believing that Alan had a stronger glass-making technique than the contemporary frontier.

"Transparency? Actually, it's just a very simple little question. ”

Alan smiled, and after getting the attention of the Buck Lionman, he explained, "The sand used in ordinary glass is not pure, and there are a lot of impurities in it, and they are the key to the color of the glass. ”

Buck is a glass technician in Southbank Town, and he is very clear about the process of making glass, and once Alan mentions it, he immediately thinks that Allen has a point.

"Then how do we get rid of those impurities, the sand is already very small and fine, and the impurities hidden in it must be very fine and very small, and it is difficult to filter out."

Eren was pleased with his reflective behavior, while the other orcs listened a little confused.

It wasn't until Alan walked to one of the walls of the glassworks and removed the linen that a blackboard appeared in front of the orcs.

Buck, a resident who had just arrived yesterday and didn't know about chalk and blackboards, saw Alan write and draw on the blackboard with white chalk, and a lifelike method of purifying sand spread out in front of his eyes.

"So the next concept I'm going to mention is quartz sand, which is a kind of sand made from crushing quartz minerals, and quartz is a very conscious mineral, and today orc slaves have dug up the magma rock from the extinct volcano, and there are a lot of quartz stones in it."

Eren dictates and teaches, hand-drawn graphics to perfect the orcs' barren thinking abilities, and the sound of each sentence automatically carries a slight hypnotic power, secretly instilling knowledge into each orc.

The slaves had a general understanding of the specific operation steps and knew how to make quartz sand.

"This is, what kind of recording method is this, it is so simple and straightforward, I can understand it almost immediately." Barker's mouth hadn't closed since the blackboard appeared.

Watching the patterns dance on the blackboard, he felt as if he had come to the quartz sand making site himself, watching the rocks being ground up, selected, washed and processed by a large machine with strange powers, and then the next major technology, which Buck had never seen before - magnetic separation!

Magnetic separation, using the principle of different permeability of various minerals, to further screen different magnetic minerals.

This step is no longer the focus, it is only about the magnetic level!

Buck's brain trembled as he listened to this miraculous screening idea, and his tail stood up in excitement.

If Alan hadn't warned him with his eyes not to let him make exaggerated movements to startle other slaves to learn, he would have almost knelt down and shouted at his master.

"Magnet is a kind of stone that can absorb iron, our magnetic separation equipment needs magnetic drums, material distribution plates, vibrating plates, etc., which can be used to remove strong magnetism, and can also remove impurity particles such as hematite, limonite and biotite to the greatest extent possible with weak magnetism."

Allen's every word was unremarkable, but it rumbled and exploded like a bomb in Barker's ears.

After that, there is a large-scale image explanation, the chalk of the blackboard is written, drawn and erased, and the explanation in detail is why it is done, what is its principle, what is the effect of doing it, and what are the advantages and disadvantages of doing it.

Of course, there are also a little technical secrets in this, such as Allen's identification technique, which can identify the magnetic rate and accurately make equipment for weak magnetic separation and strong magnetic separation.

Buck was puzzled by how to make magnetic separators, but Alan didn't say anything, and he couldn't help it.

And Alan popped out of his mouth a few unfamiliar ore names, and he also needed to ask Alan what it was afterwards, after all, he was not a mineral expert, and it was impossible to know the characteristics of all minerals.

After talking about the low-cost and easy-to-understand magnetic separation method, Allen talked about the detailed operation steps of the hollow iron pipe blowing method.

For now, Allen has not abandoned the hollow iron pipe blowing method.

Balabala, half an hour of class ended, Alan took a sip of water, and said: "Everyone rest for ten minutes, digest the knowledge just now, answer any questions, and talk about float glass after ten minutes, it doesn't matter if you don't digest it, Mr. Buck will try to digest my knowledge, and he will slowly teach everyone to make it afterwards." ”

Buck, a glassmaker from Southbank Town, lowered his head and recounted the question, and when he heard Allen's words, he raised his head suddenly, and could no longer suppress his surprised voice:

"What! And how to make glass? ”

8)