Chapter 575： air extractor

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"Look, this is the so-called air pump."

Paul patted what was called an aspirator or vacuum pump, which seemed to be fixed to the table.

Wells approached it and studied it carefully.

The main part of this thing is a metal tank. There are two valves at one end of the metal tank. One valve can only be opened inward, and the other valve can only be opened outward. A metal rod protrudes from the other end of the can, and this metal rod is connected by a movable circular shaft to a second metal rod, and the other end of the second metal rod is fixed on the edge of a rotating wheel , It is not accurate to describe it as fixed, because it is also placed on the runner with a round shaft, and there is a crank on the runner.

Guyin Burns spontaneously introduced it to him, and he first pointed to the metal tank and said, "Look, great chemist, this is a gas tank, and there is a piston in it, and there are two valves, one is called the intake valve." , one is called the air outlet valve, when the piston is pulled outward, the intake valve opens, the air outlet valve closes, and the air is drawn into the tank, and when the piston is pushed inward, the intake valve closes, the outlet valve opens, and the air in the tank air out."

He pointed to the connecting rod and the running wheel behind the metal tank and said, "This is called a crank connecting rod device, and its function is to convert the rotating motion of the running wheel into the reciprocating motion of pushing and pulling the piston. Of course, it is also used in other machines. You can do it the other way around. Then, we crank the handle and we get the piston in and out of the tank."

After listening to his introduction, Wells admired sincerely: "It is indeed a wonderful device. So, is Lord Graeman going to use this kind of air extractor to vacuum the interlayer of the bottle into a so-called vacuum?"

"Yes." Paul snapped his fingers.

"When making this thing, the piston inside was a bit troublesome. Originally, oil-soaked sackcloth was used, but the airtightness of the piston was not strong enough, and it would leak air when it was pumped. Later, it was made of animal leather. A working piston."

As Paul spoke, he picked up a short metal tube, one end was connected to the hole on the glass bottle, and the other end was connected to the air intake hole of the air extractor. The two ends of the short tube were wrapped with a thin layer of leather, which should be the same used to ensure airtightness.

After all this was done, Paul called out, "Come on!"

The door of the workshop was pushed open, and the guard standing outside came in. "Master Graham, do you have anything to order?"

Paul pointed to the wheel behind the air extractor and ordered: "You shake it."

The guard glanced at the air pump, a little confused, but he still obeyed the order, walked to the side of the machine, held the crank handle with his right hand, and turned it. As he shakes, the rotating wheel begins to push the connecting rod to extend and contract, constantly pushing and pulling the piston in the gas tank.

Thirty people including Paul, Wells, and Burns watched the bottle motionlessly.

To Wells and Burns, nothing seemed to change, since air is inherently transparent.

Only the connecting rod that pushed the piston was constantly moving, but gradually, they saw that the guard who was shaking the handle was obviously increasing his strength, and after that, it seemed that shaking the handle made him feel more and more strenuous.

The air outlet valve of the air extractor was closed and closed, which proved that the gas was being removed continuously. However, at this moment, something unexpected happened. With a bang, the bottle made of double-layer glass broke and became It became a pile of debris. Fortunately, the bottle did not burst open and no one around was injured.

This change shocked everyone. Wells and Burns stared blankly at the shards of glass, while the guard was even more stunned, and could even be said to be at a loss.

"Master Graham, I'm sorry, I...I didn't expect to break him." The guard blushed and kept apologizing to Paul.

"Ah, it's all right. It could have happened."

It was only then that Wells and Burns noticed that the Earl had a calm expression on his face, as if he was not surprised by the broken glass bottle.

"It's very strange." Guyon Burns scratched his head and asked, "Why did the glass bottle break? It wasn't hit by anything."

Yes, all eyes were on that unfortunate bottle, and nothing flew to hit it.

"Yeah, why did the bottle break?" Paul also asked, but according to Wells, there was no sense of doubt in the earl's words.

"There must be something that exerted [force] on the bottle, so it shattered." Paul said.

What could that be? After hearing what the earl said, Wells thought, it seems that there is only air around.

um, air? Haha, joke. He pushed the thought out of his mind.

"Well, anyway, we've got to have a stronger bottle, perhaps with thicker glass walls," Paul concluded. "I'm going to have to get someone to remake it. Ah, yes, Wells."

Paul looked at the alchemist, "What do you want me to do?"

Ah, yes, I can come to the lord for important matters, Wells remembered his purpose of coming to the lord's mansion.

"That..." He said nervously, "Master Graham, I have a student who..."

"What happened to him?" Paul waited for Wells to continue.

"Uh...he is a very talented person in chemistry, with an active mind and excellent grades. He helped us a lot in the laboratory."

"Hmm, so? Are you asking me to grant him a position? Aren't you and Hoffman in charge of everything in the chemistry lab? You don't need to come to me." Paul was a little puzzled, and Will Did Stan come through the back door? Or he and Hoffman had any disagreements on how to treat this student, and he needed to decide.

"But unfortunately..." Wells lowered his head and whispered, "This student...his name is Fadeyev."

Fadeyev? Paul narrowed his eyes If I remember correctly, Fadeyev seems to be a family of squires who participated in the rebellion.

"So... this student of yours..." Paul lost his enthusiasm just now, "Is he in prison now?"

The interrogation of the rebels is currently underway, and all the families involved in the rebellion have been detained by the whole family.

"Yes, Lord Graham."

"So, what are you looking for me for?" Paul asked Wells again the purpose of coming here, and there was a hint of impoliteness in his words.

Wells felt the change in the earl's tone, and his heart beat faster. The earl seemed very sensitive to this.

"I would like to ask you, Lord Graman, can...can you be lenient with this student of mine."

Wells carefully stated his request. He came from Jingyao, and he knew that many lords treated those related to the rebellion. At worst, they would be expelled and exiled. If they were more ruthless, they might kill them all.

He didn't believe that his student would really take part in the rebellion, but what would the Count think?