It's easy to say, Cheng Chuliang just can't kneel for a long time, and Jiang Wei is helpless. His original intention was not to accept any disciples, and he felt that it was troublesome.

Xu Jialang originally said that he wanted to learn from himself, but now? After asking him to memorize the multiplication formula and assigning him some arithmetic, he never came again.

But on the other hand, if there is a disciple who can help with something, it would be good.

Jiang Wei thought about it for a while, and finally said,

"It's not impossible for me to accept you as a disciple, as long as you can meet my requirements."

Cheng Chuliang is waiting for this sentence,

"Please ask the master to do the question."

Jiang Wei didn't want to accept stupid students, in a short period of time, he considered several requirements for students, first, have a certain logical thinking. Second, have enough curiosity and exploration spirit for new things. So, there are the following topics.

Question 1, Xiao Wang, Xiao Zhang, and Xiao Zhao are close friends, one of them became a businessman, one entered the Guozijian and became a scholar, and one joined the army.

In addition, they also knew the following conditions: Xiao Zhao's age was older than that of the soldiers, the age of the scholar was younger than that of Xiao Zhang, and Xiao Wang's age was not the same as that of the scholar. So who is a businessman among these three? Who is a scholar? Who is a soldier?

When Cheng Chuliang saw the first question, he immediately felt that his brain was not working well, and he was in a mess. This is a logical question. A test of one's logical thinking ability.

But for most Tang people, logical thinking skills are still relatively poor. So Jiang Wei came up with a simple logic problem.

Question 2,

The second question is more difficult, which tests a person's imagination and exploration ability. It's not written on paper, it's a physical object.

Jiang asked his sister to fetch something, a strange thing.

On a wooden shelf, the first thing that catches the eye is a trumpet-shaped wooden cylinder, the bottom of which is connected by a large steel wire. One end of the wire is extremely smooth.

Underneath is an iron rod, and at one end of the iron rod is a wooden rotary knob, in the middle of the iron bar. Wrapped in a layer of tin foil.

Tin foil is a great invention in China, and it can be seriously said that without the invention of Huaxia, the gramophone does not know when it will appear.

Tin foil, also known as tin foil, is a thin sheet of metal tin that is hammered by hand. Light as a feather, soft as satin, thin as a cicada's wings, soft in color, and as thin as less than 0.12 microns.

In ancient times, it was commonly known as "beating tin" and "pounding tin foil", which was derived from the long-standing gold foil calcination technique, originated from the Eastern Jin Dynasty, matured in the Southern Dynasties, and was popular in the Song, Qi, Liang and Chen, and flourished in the Qing Dynasty.

In the Qing Dynasty, tin foil was exported to overseas in large quantities, and the world's first phonograph invented by Edison was made of tin foil.

And this strange thing is the most primitive gramophone.

The structure is very simple, and it is easy for elementary school students to make, but it is full of whimsy.

Cheng Chuliang looked at the gramophone in front of him, with a blank expression, what is the topic? He really didn't know what this strange combination was.

Jiang Wei saw Cheng Chuliang's confusion, smiled slightly, grabbed the wooden handle and began to rotate, and pointed to the horn again,

"Talk to it."

The threads designed at both ends of the iron rod are made by the blacksmith little by little, and when Jiang Wei turns the handle, the iron rod is also moving to the left little by little.

Cheng Chuliang was at a loss for a while, he didn't know why he was talking to it, what was he talking about, and what was going on if he didn't say it. couldn't help but glance at Jiang Wei, and seeing that he nodded to himself, he had to bite the bullet and say a word to the horn.

"Master, I said, I really said, but what did I say?"

Jiang Wei couldn't bear to look at it directly, and Cheng Chuliang's tangled and embarrassed expression at this time was really a bit strange.

"It's too quiet, louder, whatever you want."

Cheng Chuliang is really anxious and at a loss, is this the topic? What exactly is this topic? He was so anxious that he almost turned around.

"Master, I will definitely learn your skills and carry them forward, so you can rest assured."

Jiang Wei sighed, I'm not dead yet, how can I rest assured? He stopped cranking the handle,

"Okay, needless to say, keep an eye on it."

Jiang Wei reversed the handle and reset the iron rod. Then he shook the handle again, this time without Cheng Chuliang shouting, but the sound of Cheng Chuliang coming from the loudspeaker above.

Cheng Chuliang was stunned on the spot, and was speechless when he pointed at the gramophone for a while.

"If there's anything you want to say, just say it."

Cheng Chuliang sighed, and couldn't help but swallow a mouthful of saliva,

"Master, are there any monsters in here? How are you learning me to speak? ”

Jiang Wei glanced at Cheng Chuliang with a smile,

"There are no monsters in it, remember, if you want to be my disciple, at least remember that immortal arts and immortal weapons are products based on truth. So what is the reason that this thing can record our voices? The second question, I want you to observe it, understand it, discover it, and within ten days, I want to hear your opinion. ”

Not long after, Cheng Chuliang was excited and left the Xu Mansion decadently.

Jiang Wei shook the folding fan, while Ruoniang was playing with the second gramophone, and she was playing.

"Brother, why does this ugly thing talk?"

Seeing his sister ask himself, Jiang Wei drank a cup of cold white and replied casually,

"That's because the sound is vibrating, do you see the tightrope of the horn? It's responsible for transmitting the sound to the foil, and then the foil is responsible for recording the sound. ”

Ruoniang looked at her brother with a confused face, her head was buzzing, she could understand every word, but when she was put together, she didn't understand.

So Jiang Wei regretted it, he underestimated the curiosity of children, so Ruoniang turned on the questioning mode, and explained until the night, sleeping in bed Ruoniang was still asking,

"Brother, why does the sound vibrate?"

Jiang Wei said with dark circles under his eyes and drowsiness,

"Because sound is a pressure wave, as soon as you speak, it causes a change in air pressure, and a sound is formed."

Ruoniang nodded, getting more and more energetic, while Jiang Wei became more and more sleepy.

"Brother......

"We'll talk about it tomorrow."

"Oh......"

In the dark night, Ruoniang held back her curiosity, opened her big black eyes, and was full of why,

"Brother, then why does the water sound when it boils?"

Jiang Wei: ......

So, Jiang Wei happily pretended to snore and successfully deceived Ruoniang.

That night, Cheng Chuliang didn't sleep all night, his mind was full of it, why did it learn to speak to me?

Until dawn, he still did not fall asleep, so he simply did not sleep. As a result, the entire Guogong Mansion was jumped.