Xin Lingjun used a copper pipe to connect the tunnel and the bedside of the bedroom, so that he could listen to the movement in the tunnel at any time in the bedroom, while Wu Fu was more clever, he hid copper pipes in each private room of the Qinglou, and obtained information by listening to the conversations of the bigwigs who came to visit the Qinglou.

Of course, Lu Yunzhou will definitely not use the methods of the ancients, although the appearance of listening equipment in this era is already a very terrifying thing, but Lu Yunzhou from the modern era, there is obviously a better way-

It's a microphone!

The principle of a microphone is that sound travels faster in a solid than it does in air.

And the copper pipe is essentially using air to transmit sound, and the sound will be damaged to a great extent, so Lu Yunzhou does not plan to use copper pipes, but plans to use copper wires!

Lu Yunzhou took the brush, then took a piece of cloth that was placed on the table to record writing, and began to draw a microphone on the cloth.

Everyone gathered around to see what Lu Yunzhou had drawn.

Qi Fei said curiously: "Little brother, this is the eavesdropping device you are talking about?"

The others were also confused as they looked at the pattern that Lu Yunzhou had drawn with just a few strokes.

"It looks like there's a line in the middle and two on both sides...... Morning glory?" Qi Ting asked, confused.

Lu Yunzhou put down the brush and said with a smile: "This is called a microphone, which can transmit sound through a long distance, and the two ends are called horns like morning glories, as long as you put your ear on the horn at one end, you can hear the sound from the horn at the other end." ”

"Is it really so amazing?" Qi Fang said in surprise.

Everyone else was surprised, and everyone had a look of doubt on their faces.

Lu Yunzhou nodded and said with a smile: "If you don't believe it, you can make a simple microphone first and try the effect first." ”

Qi Ting was surprised: "What should I do?"

Lu Yunzhou stretched out his hand and gestured and said, "First of all, you need a very long cotton thread, preferably to the length of two rooms, so that you can test whether you can hear the sound in the distance." Then you will need two cups, two small wooden sticks. Lu Yunzhou pointed to the microphone drawn on the cloth, "Just like the one drawn above, the two cups are used as horns, a small hole is chiseled through the bottom of the cup, and a cotton thread is used to pass it, and then a knot is tied in the cup and fixed with a small wooden stick, so that it is done." ”

Qi Min glanced at it and said decisively: "This is easy, I will immediately go up and order someone to take the materials, and it will be made soon, you can wait down for a while!"

Qi Min hurriedly turned around and left the secret room, and sure enough, not long after, he came back, carrying a small box in his hand, which contained a cotton ball of thread, two pottery cups, two small wooden sticks and a chisel.

Qi Jing rubbed his hands and said: "I've done the handiwork, I'll come!"

Qi Jing took the chisel and carefully began to drill holes at the bottom of the pottery cup, everyone looked at him with curious eyes, Qi Jing's technique was really skillful, and he quickly drilled the two small holes, and then passed the two ends of the cotton thread through the small holes at the bottom of the cup and tied them in the cup. Once all the cotton threads have been bypassed, the microphone is ready.

Qi Jing took the pottery cup, turned it over and pondered for a moment, then looked up and asked, "Who will try it first?"

"I'll try it!" Qi Fang took a pottery cup with an expectant face, opened the door, and walked out of the door, Qi Jing took the pottery cup in his hand, and the cotton thread was gradually pulled away, until it was about to be straightened, Lu Yunzhou walked over and closed the door.

"Uncle, listen to if there's a voice!" Qi Ting couldn't wait to look at Qi Jing.

Qi Jing clasped the pottery cup to his ear, listened for a while, and suddenly showed an expression of excitement and disbelief on his face, turned his head to look at Lu Yunzhou and the others, and said dumbfounded: "I can really hear it!"

Qi Jing listened for a while, his eyes widened and said, "The third brother said over there, he can also hear me!"

Qi Ting was eager to try: "Uncle, give it to me!"

Qi Jing handed the pottery cup to Qi Ting, Qi Ting carefully put it to his ear, and after a while, there was a surprised expression on his face, and he nodded again and again: "Father, I'm Ting'er, I can hear your voice!"

Lu Yunzhou stepped aside, watching this group of ancient people happily playing with the microphone, he always felt that this painting style was a little wrong, and couldn't help scratching his head.

"Why do I always feel ...... Sooner or later, the style of painting in this world will be led by me?"

Lu Yunzhou silently walked to the edge of the map, while studying the map, he turned his head from time to time to watch them play, and the sound of shouting and screaming kept drifting into Lu Yunzhou's ears--

"Father, I'll talk a little further away from this cup, can you hear it!"

"I'll try to be quieter!"

"Second brother, let me hear it too!"

"Okay, good, here you go, it's amazing!"

"Wow! It's really the third uncle talking!"

"That's right, third uncle, I'm Fei'er!"

"Ahem, Fei'er, listen to your father too!"

“......”

"It's not the microphone that's fun, it's the ...... of the ancients," Lu Yunzhou thought silently in his heart.

After a long while, Qi Fang finally walked in from the outside, and at this time, everyone already knew that the microphone could indeed transmit sound, and everyone looked at Lu Yunzhou with excitement.

Qi Ting said excitedly: "Third brother, how did you find this thing, could it be that you heard the assassin's conversation last night, and it was also because you used this thing?"

Lu Yunzhou blinked, pushed the boat down the river and said, "That's right!"

Qi Jing's face was full of red light, and the beard on his lips shook with an irrepressible smile: "Yu'er, your idea is promising, if we install such a microphone in the restaurant opened in Linzi, then all the big and small things that happen in Linzi will not escape the eyes and ears of the Qi family! If such a restaurant is opened in the capital of all countries, then there is nothing that our Qi family does not know about what is going on in various countries! Not only that, but we can also obtain the positions, personalities, and personalities of some important people in various countries through eavesdropping. Habits and other detailed information! These can come in handy when needed!"

Qi Min agreed: "Yes, Yu'er's original new dishes can definitely attract everyone to our restaurant, especially officials, nobles, and businessmen from various countries, after they have eaten and drunk in the box, the topics they talk about will involve some key information!

Qi Fang waved his hand and said excitedly: "There is no problem with this! I will send the Qi family soldiers to help the eldest brother, and I will pull a special intelligence team when I go back, and if there is a war in the future, it may be of great use!"

Qi Min thought for a moment and said, "Since this is the case, then this restaurant is not suitable for cooperating with other families, otherwise I am afraid that such a secret will not be kept!"

Lu Yunzhou interjected on the side: "No, father, only when there are more partners and the higher the status of the partners, will our Qijia restaurant become a fixed place for the upper-class people from all over the world to gather, and only the more popular the restaurant is, can we obtain more useful information! There are various ways to buy shares, and I have a way to make partners not participate in the operation of the restaurant!"

Qi Min raised his eyebrows and said, "What way, talk about it!"

This time, everyone turned their trusting eyes on Lu Yunzhou, as if as long as Lu Yunzhou said it, it was the truth!

Lu Yunzhou said with a smile: "Although we want to find a partner, everyone has money to earn together, but it doesn't mean that this is because our Qi family has no money to do this, we are to win favors, but also to win popularity, this partner will also understand, so as the founder, we naturally have the power to make rules! My method is to distinguish the share structure, and divide all the shares into two types: A and B shares!"

What Lu Yunzhou wants to propose is the AB share model of later generations, but after a large amount of tampering, the ancient version of Lu Yunzhou's version is simple (changed with the protagonist's happy desire) AB share model!

Lu Yunzhou explained: "Among them, only the founder can hold the first share, not sell, and have the complete right to operate the hotel on a daily basis, and the right to appoint and dismiss personnel, so as to ensure that the secrets of the restaurant are not discovered! The second share can be sold or resold to each other, and the shareholders of the second share cannot participate in the daily operation of the hotel and the appointment and dismissal of personnel, but they can receive dividends! In order to show fairness, the investment amount of the holder of A share must be twice that of the holder of B shares. In order to win over more partners, we will suffer a little loss, and stipulate that the dividends obtained by the holders of A shares shall not be higher than 30% of the total profits! This condition is actually a relatively lossy for the Qi family, but it should be quite reasonable for the partners of B shares, I believe that no partners will have any objections, but they will think that our Qi family is selling favors. Therefore, we only need to explain the rules clearly in advance before cooperation, and whether or not to participate in investment is voluntary!"

Qi Jing and the others nodded again and again, and they all agreed!

Lu Yunzhou said: "There are two situations here, the first is that the Qi family opens a restaurant in Qi State! Because of the special status of the Qi family in Qi State, opening a restaurant will encounter obstacles from the king, Tian Xiang and other families, so before the preparatory stage of the restaurant, we must win over the partners, distribute the shares of B shares, and eliminate all kinds of difficult factors, so that our Qi family can open the restaurant in Qi country."

I believe that there is no problem here, because the new dishes have been highly sought after among the nobles and bureaucrats in Linzi, and during this period of time, every time the meal arrives, there will be countless people who come to our Qi Mansion to eat, I believe that my father has also heard a lot of people suggest that you open a restaurant, and Zhong Sun Long has personally mentioned to me whether he can cooperate to introduce new dishes into his restaurant! Therefore, I believe that once our Qi family proposes to cooperate, and the conditions of cooperation are so generous to investors, then there will be many people who are willing to participate! Therefore, there should be no problem with the restaurant opening in Qi Kingdom!"