Hanshan, the governor's residence, and the melodious melody came from the piano room.

In the room, Xue Yuechang was playing the seven-stringed lyrics, very devoted, and Li Li was also very devoted to listening.

The beauty plays the piano, which is intoxicating, and the seven-string piano played by Xue Yuechang has a great origin, and it is even more pleasing to Li Li's eyes.

Not long ago, news came from Jiankang that the culprit of the regicide had been found, and was Xiao Ben, the Marquis of Jian'an.

Xiao Ben was cut off after being paraded in the streets and deserved the crime, but Li Li made an indelible contribution in the process of "solving the case" that he found out.

It was Li Li who secretly arranged it and spent more than half a year to find clues of the traitor, and then report it to the court. With the clues that the King of Poyang said he had, he finally found out Xiao Ben, a person with great crimes.

The news reached Hanshan. The chief of Jingzhou Wang Chong, with his son Wang? and his wife Xiao Miaoqing, went to the mansion to thank Li Li in person.

And once again apologized for the misunderstanding.

Wang Chong was the cousin of the late emperor, Xiao Miaoqing was the daughter of the late emperor, and Wang was the son-in-law of the late emperor, which was the right thing to do.

To express his gratitude, Wang Chong, who was born in the Wang family in Langya, gave Li Li a guqin he passed down from his family as a thank-you gift.

This guqin is said to be a zither used by the saint of calligraphy Wang Xizhi (referring to the body of the piano, not the strings). After all, Wang Xizhi was born in the Wang family of Langya, and it is reasonable for Wang Chong to have relics of his ancestors in his hand.

The great name of the saint of calligraphy is known to everyone in the north and south, so although Li Li didn't understand the piano, he was still very excited when he received this gift.

Wang Xizhi had definitely used more than one piano in his life, but it is of course a pleasure to have the relics of the Saint of Calligraphy in his hand.

Next to him, Xue Yue'e, who was pouring tea, saw Li Li being excited and said softly: "My husband, let me play a song later."

"Yeah..." Li Li nodded, but shook his head again: "No, next, I'll play the piano, please help me hear what other shortcomings are."

"good."

After Xue Yue'e finished speaking, she sat next to Li Li, leaned her head against the other person's shoulder, closed her eyes, and listened to the sound of the piano.

There was a voice outside the door, and Xue Yue'e heard that it was the maid who greeted her wife, so she quickly sat down. After a while, the lady came in.

Xue Yuechang just finished playing a song. When she saw that the wife was coming, she winked and quickly took a leave with her sister.

After staying there was no one else in the room, Huang Yan sat in front of Li Li and looked at the other person's face seriously.

Seeing this, Li Li smiled and said, "What's wrong, with a solemn expression on his face."

"What the hell is going on?" Huang Yan asked, and Li Li shrugged: "The question is not in the end, how can I answer?"

Seeing Huang Gui looking at him like this, Li Li spread his hands: "Now, both inside and outside the court and the country know that I, Li Sanlang, secretly searched for traces of the thief, and made great contributions to bringing him to justice in the end."

"Isn't this good enough to get the fisherman who was promoted to the army to find out the culprit of the monarchy and to repay the favor of the late emperor as he met?"

"I'm not asking this." Huang Yan shook his head, "I don't care. What kind of reward will the court give you for this."

"I want to know some details, such as how did you control Princess Luling?"

Li Li looked at Huang Yan when he heard this, and Huang Yan also looked at Li Li with his eyes.

Huang Yan heard Li Li tell him about the incident, but did not involve specific details.

Huang Yan was very smart and soon heard some details from Li Li's ambiguity.

For example, why did Princess Luling honestly follow Li Li's arrangements and sue the adulterer Xiao Ben for "inappropriate attempt".

The couple looked at each other for a long time, and Li Li asked: "I'm curious to kill the cat, are you sure you want to know?"

"Yes." Huang Yan nodded, and Li Li smiled: "Okay, this is what you asked for."

After a while, Li Li brought a wooden box and placed it on the table. Huang Yan looked closely and saw that the wooden box was square, like a jewelry box.

But the difference is that there is a rotating crank on the left side of the wooden box, and there is a huge copper horn on the top of the wooden box.

The inside of the copper trumpet is made of paper. Huang Yan looked carefully and thought it was a trumpet made of paper and was covered with a copper shell.

And the end of the trumpet is in the wooden box, and it seems that something in the wooden box can blow the trumpet?

Li Li sat in front of the table, under Huang Gui's gaze, and reached out to hold the handle of the wooden box: "This is the handle of the clockwork. Don't shake it again after the clockwork is tightened."

Huang Yan knew that "clockwire" was a device that could provide a certain amount of "power" to the machinery, and nodded: "Yes."

"Okay, I'll start this device and you must stay calm no matter what happens next."

After Li Li finished the explanation, he saw Huang Gui with a "destined death as if he was home" expression. He stopped talking and pressed a button on the top of the wooden box and a trumpet.

A sound came out of the speaker, as if someone was talking in the wooden box, but with a rustling sound.

It seemed like talking to a paper speaker, so the voice was filled with tremolo.

Huang Yan was startled at first, and then his cheeks became hot.

This was a moan, it was probably a man and a woman doing things, and it was just the most important time.

The sound was so realistic that Huang Yan felt immersed in the scene, as if he was squatting beside the bed, listening to the men and women 's singing'.

After a while, the movement ended abruptly, and then he breathed gently.

Then, the conversation sounded, and the couple was talking, with the content of the conversation being extremely explicit, and Huang Yan felt shy when he heard it.

Just as I was embarrassed, the sound disappeared and the wooden box disappeared.

The few words of conversation between men and women, and the names used by Huang Yin can hear the identities of both men and women: the man is Xiao Ben, the Marquis of Jian'an, and the woman is Xiahou, the Princess of Luling.

She is a smart person, so she knows that this sound must be the movement of Xiao Ben and Xiahou's affair, but she is witchcrafted...

No, it is not a magic trick, it is a device that "leaves" the sound and becomes evidence of affair between two people.

It seems that this is the reason why Xiahou was taken over by Li Li.

But Huang Gui couldn't believe that there were machines in the world that could "stay" the sound.

"This is called a phonograph." Li Li said softly, stroking his masterpiece with his hands, and then added: "To be precise, it is a wax phonograph."

"The wax cylinder is a container that leaves sound, a hollow thick paper cylinder, wrapped with wax outside, which can leave scratches, that is, sound tracks."

"Wax tube phonograph?" Huang Yan murmured, shocked beyond words, and Li Li introduced it.

The phonograph appeared in the 19th century and was in the form of a "wax phonograph" and a wax phonograph, which was a sound storage medium. At that time, it was called a "high-tech equipment".

Even in later generations, people who do not know the principles still find it unfathomable when talking about the advent of phonographs.

However, the principle of phonograph is simple, and some middle school teachers have even used simple materials to demonstrate the principle of phonograph.

A paper cup is fixed with a steel needle at the bottom, the steel needle is vertically downward, and the needle tip is placed on the side of a plastic cup.

The plastic cup is driven by an electric small motor and can rotate slowly.

The function of a paper cup is a sound cylinder and a trumpet.

When people talk to the paper cup, the sound caused the paper cup to vibrate. The vibration also caused the steel needle at the bottom of the paper cup to tremble slightly, so traces of varying depths were carved on the rotating plastic cup.

This is "showing" (recording). If the process is reversed, there will be another effect:

When the plastic cup rotates, the marks on it cause the steel needle to tremble continuously. The trembling steel needle will also cause the paper cup to tremble, so a sound will form in the cup and spread from the mouth of the paper cup...

This is "release" (playing).

The entire vocal structure is very simple, but the sound emitted will have "noise", such as the "rustling" sound when the paper cup vibrates, which is different from the original sound, that is, "distortion".

To restore the real sound, a high-quality "microphone" is needed to record the sound, and a high-quality "paper speaker" and other devices are used to "fidelity" during playback.

Because the principle is extremely simple, Huang Yan often hears Li Li talk about various "physical common sense", so he quickly understands the principle of "voice".

Then we can understand the general structure of the "wax phonograph".

I also understand that the wax cylinder that "records sound" can be disassembled and installed on other "photophones" to "releas" the sound.

But Huang Yin couldn't understand what method Li Li (him) used to take advantage of Xiao Ben's affair with Princess Luling to "stay" the sound made by the process.

Li Li explained the evidence collection process: "The wax cylinder of the phonograph is limited in size, so the phonograph time is very short. I have a special phonograph with six sets of wax cylinders, corresponding to six speakers."

"Six sets of wax cylinders run one after another, so the total sound-taking time is longer."

"But the size of the device is not small, so it is disguised as an incense burner, and the trumpet is mixed with the copper flowers around the incense burner."

Huang asked: "But how to trigger this device?"

"Simple, use the delay trigger device. After the incense burner is ignited, it will trigger this device. There is a certain probability that the sound at that time will be recorded in a specific period of time..."

"How to judge the time interval? When will the two of them do their jobs when the incense burner is lit?"

"Borrowing the servants and estimating the time, after all, the time for incense in advance is relatively stable."

"Isn't this a big fortune?"

"This is a matter of probability. Xiao Ben and Princess Luling have had an affair for several years. The habit has become natural and the behavioral patterns can be traced, so the probability of success is not low."

Huang Gui still had a question: "But Xiao Ben might not put this incense burner on the head of the bed, or... uh, when doing business, it happened to be near the incense burner?"

Li Li smiled and said, "This is a mentality issue. You have to consider the mentality of adulterers. Xiao Huangwen... cough cough..."

Huang Yan narrowed his eyes slightly when he heard this: "Little Huang Wen?"

Li Li, who was hiding the words, quickly concealed: "Don't change the topic, Xiao Ben, who is unscrupulous, will he think if he gets the incense burner given by Xiao Ying?"

"I will subconsciously treat the incense burner as Xiao Ying's incarnation, place it specially on the head of the bed, and then do business with the princess."

"This kind of mentality is like doing things with his or her own people in front of a good person, and once the incense burner is lit and the timing mechanism is triggered, there is a certain chance to record an important conversation."

"Of course, the phonograph's phonograph's time is limited and very short. The success rate of this approach is not high after all. It must be bribed to his confidant servant, but it is worth a try, but it is worth a try."
To be continued...