This warehouse building is no different from the warehouse building in the city. However, referring to the closest well railing, you can tell that the location is outrageous.

Who would build his own warehouse building outside the wall?

This warehouse building, independent of the courtyard wall, was obviously disguised by the "wall mechanism" that blocked it. The "gate tower mechanism" had been removed first to block the road ahead of the Sanhe Knights. This warehouse building was left alone to guard the original place. The reason why it failed to move simultaneously or was disturbed by the drum sound is unknown.

Stealing close.

Bai Liwei took the goose feather knife in his hand, and he stabbed it. The steel blade penetrated into the wood three points. When he shaved lightly, the dust fell like rain. It was just outside the board wall, applying mud, embellishing chalk, and disguising it as a warehouse building. The inside was still made of wood.

Dian Wei looked up at the towers on the warehouse. It was not difficult to throw the oil bottle into it.

"Don't attack forcefully and find the entrance." Su Yue, who was protected by the white elite soldiers, whispered.

"Yes." Dian Wei winked, and the white and virtuous soldiers immediately searched around the warehouse building.

In a moment, a Bailiwei discovered the entrance. There was a clear crack between the entrance and the surrounding chalk coating. It was obviously broken when opening and closing the door. It was not visible in the distance, but it was clear at a glance. The steel knife inserted into the crack and opened the switch. The Bailiwei used the steel knife to slightly open the crack. When he looked sideways, he was facing a yellow turban hero with his eyes facing each other.

Before the Yellow Turbans could ask questions, the white-superior soldier had already rushed in.

The goose-feathered sword swept across the door. The door screamed repeatedly. Since the war has begun, why should you hide your own personal information? The white elite soldiers rushed in one after another, from bottom to top, slaughtering all the yellow treacherous thieves in the warehouse.

Seeing the Yellow Turban Strongman under the knife, he seemed to die with his eyes open. He looked down at the yellow Turban outfit on his body, and then he grinned: "I forgot that I'm waiting for the Yellow Turban!"

"Transfer the body quickly." Su Yue covered his mouth and said.

The Bai Li Jingshang then moved the corpse out and invited Su Yue and a group of good craftsmen to come in.

If it is like the Ji Kingdom War Tank Tower and the Mechanical Warehouse, it is also divided into four floors. There is no animal power wheel on the bottom floor, but it is driven by more than a dozen Yellow Turban strong men. There is a soldier hidden in the middle floor, an arrow window on the upper floor, and a powerful crossbowman lies in ambush. They are all chopped and killed by white spirit soldiers.

The entire mechanism is extremely simple. The only exception is that in the top pavilion, the top pavilion originally had a scout, and "removing bamboo tubes" were embedded on all sides. The lengths of the bamboo tubes vary, similar to the thirty-six 生生 on the 生. The difference is that both ends of the 生生 are covered with "thin cowhides" to form a "sound transmission bamboo tube". In the middle of the top pavilion, there is a "seven-string instrument" with a unique shape. It is unknown whether it is a musical instrument.

At this time, the sound of the bamboo tube drum rumbling, but the "seven-string meter" hanging above the head did not move at all and did not make any sound.

"The sound of drums really disturbed the transmission of the Yellow Turban thief." Su Yue said, "Let's wait for the left general to stop the army."

"Yes." Dian Wei ordered people to garrison.

After fighting for a day, until the hour of the morning, the drums gradually stopped. Several streets and alleys surrounding the city were cleared out, and the left-ranking general Huangfu Song ordered soldiers to pour into the city and camped. Ye City was vast, and the Yellow Turban Thiefs defended the death. The street fighting was not a day. Steady and steady progress was also the right way. Huangfu Song was not blinded by his hatred life, and was a good general in the world.

When the drum sounds gradually become unheard, the piano sounds start again. The piano sounds screamed and were very rapid. The "sound transmission bamboo tube" that was about to stop was motivated again. This time, the "seven-string instrument" finally sounded.

Among the seven strings, three strings first occur in sequence, and then two strings sound together. This is repeated.

This is the "code word" of the Yellow Turban Thief.

The principle used is actually extremely simple: "resonance phenomenon", or "resonance effect".

The ancients discovered the phenomenon of resonance very early. "Zhuangzi Xu Wugui" records the resonance of tuning and sedan: "For it, it is abandoned in one hall and in one room. The drum palace is moving, the drum corners and corners move, and the rhythm is the same. When changing the tune of one string, there is no right to the five tones. When drumming it, the twenty-five strings move."

In this regard, Dong Zhongshu, the former Han Dynasty, explained in his "Spring and Autumn Festival, the Chapter on the Moving of the Same Types": "All things go away from their differences and follow their differences, so when the qi is the same, the sound is the same, and when the sound is the same, the test is obvious. Try to adjust the zither and the zither are wrong, and the drum is the other palaces are the answers; when the drum is the shang, the other merchants are the answers; when the five sounds are compared and the sound is the sound, it is not a god, but the number is the same."

It means that objects with the same properties can induce each other. The reason why the drum palace and the drum merchants respond is that their tone is consistent. This is an inevitable phenomenon and there is nothing magical about it.

Regarding the use of resonators, "Mozi Beijiu" has long recorded it. For example, dig a deep pit at the base of the city at every distance, place a pottery jar in the pit, and cover leather on the mouth of the jar, so that the smart and intelligent person can lie at the mouth of the jar. If the enemy digs a tunnel to attack the city, not only can the sound be detected, but the direction of the enemy can be identified based on the height difference of the "sound" of each jar.

For example, later troops made a military pillow called "Cowhu Lu" with leather, so that Cong'er soldiers could use it at night. "All people and horses travel thirty miles away, and they were heard from the east, west, south and north." There is also a record in "Mengxi Bitan·Guiyi" that a quiver made of cow leather "were attached to the ground and the sound of people and horses within several miles will be heard." At the time of the Song Dynasty, people at that time had used "removing the stalk and growing bamboo" and buried it directly on the ground, listening to the mouth of the bamboo tube, "buzzing like a drum." Qi Jiguang of the Ming Dynasty also used this method to prevent Japanese pirates from attacking.

However, not everyone has such insights.

Seeing that the "Seven-String Technique" was playing by itself, Dian Wei, who was cracking the tiger and leopard, widened his eyes. Bai Liwei under his command was even more discussed.

Su Yue comforted in a low voice: "Don't panic. It's just 'similar interaction'. There are long records in the book. Just find the source of the piano sound to find the master behind the scenes."

"The sound comes from the sky." Someone in Baili said, "The zither must be in a high place."

"No hurry. First find out the thief's 'strings', and then find an opportunity to defeat the enemy." Su Yue had the rigor of a craftsman of a great country.

"Yeah!" Dian Wei ordered people to guard strictly and stay overnight in the enemy's camp.

Night gradually fell. When you couldn't see your five fingers, you suddenly heard the wheels rolling around you. The railway tracks were also good for sound. You had removed the mechanisms that had resisted the Han army and returned to your position at night. The warehouse building that was erected outside was then surrounded by walls and gate towers. If you raise the fire at this time, the courtyard would be deep and there would be no flaws.

The surrounding machinery and equipment all went to meet the enemy. Why did the Canglou stop moving? Su Yue had already thought of the whole story.

The warehouse building is high, which is a "relay resonator". It takes over the "string key words" from the Yellow Turban Qu Shushuai, so it will not move easily.

The so-called "the palace and palace move, the drum and corner move" is the reason why "gong Shang and Jiao Zheng Yu" is the same as the rhythm, which is also the accuracy of the tone of the current low. People at that time sighed "the rituals and music are broken". How can they be completely summarized by a word of giving a sigh.

That night, someone suddenly knocked on the secret door of the Canglou.

Dian Wei signaled everyone to be on guard, and then asked in a low voice: "Who is outside the door!"

"It's just that I'm here to send food." Someone outside the door replied in a low voice.

"I'm not hungry today, I'll come back tomorrow morning." Dian Wei replied rudely.

"In this way, go to the next place when you go down." The visitor left immediately.

"Can you reveal your flaws?" Su Yue asked in a low voice.

Waiting for a long walk, Dian Wei shook his head gently: "No."
Chapter completed!