"Boyuan, this building is good, but..." Liu Bei led Liu Yi, Pang Tong, Guan Yu and others to do the work of inspecting a residential house for the last time. Looking at the five-story residential building in front of him, Liu Bei suddenly thought of a problem and looked at Liu Yi and said, "The people need to make fires and make food and draw water. How to solve this problem?"

Liu Bei also became famous slowly. He lived a hard life and knew that the people's lives were not easy. If it was their mansion, then there would be no problem and manpower could complete it. But you still expect ordinary people to have water for you at home, and how to make fires and rice at home? I didn't see a chimney.

"Do you know what the water tower is for?" Liu Yi pointed to the water tower four or five feet tall in the distance and said with a smile.

"Water Tower?" Liu Bei looked over in confusion. There were more than 30 such water towers in the entire Xiangyang City. Liu Bei always thought it was a warehouse.

"A recent interesting discovery is that the water in the water tower is directed into the house with bamboo pipes, and then a gate is installed. When using water, as long as the building is not high than the water tower, the water in the water tower will flow automatically. The specific principle is related to the weight of the water, and it can only work more than four meters at most. No matter how high it is, it will not reach it. Among these houses, each of them is arranged in three bedrooms and one living room, with a special kitchen and toilet. The filth can be washed away directly through the drainage system, and is sent directly into the septic tank outside the city through the sewer, with the intention of making fertilizer to irrigate the farmland."

Compared with modern times, it is impossible, but the principle of a flush toilet is actually not difficult, and it does not require much craftsmanship. It is a squat and flush directly. However, if the toilet does not have the properties of odor elimination, there is nothing to do.

Over the years, Liu Yi's use of water is no less than the level in his previous life. Of course, there is no such thing as a high-pressure pump, and it is impossible to do it at the current level. However, it is still fine to make a water tower based on the pressure of the water itself, and it is still fine to drain the water tower from outside the city. In the process of opening things, Liu Yi has a detailed record of the application of hydraulic power and some water pressure issues, principles and utilization. Most of the craftsmen present know a little, but Liu Bei and others are basically laymen, so Liu Yi explained it more in detail.

"In fact, this method is used in Yueyang City and fishing towns. The bathhouse is used in this way, but there is no water tower, and there is no such high residential building in Yueyang."

The houses in Yueyang are at most two-story single-door households, so there is no need to build a water tower, just build toilets or something on the first floor.

Even so, Liu Bei was a little surprised and said with a little joke: "The people in Xiangyang City are blessed. I am afraid that even the workers and nobles in the court will not be so convenient."

"These things are recorded in the works of natural crafts. If someone is willing to study them carefully, it is not difficult to design and build such a city." Liu Yi said with a smile. Now the technology has almost been perfect in theory. In terms of practicality, cement and cranes have also been made. People with some basic experience in this industry can almost do it. However, the city built does not have the attribute bonus of Liu Yi's city built, and the speed is impossible to compare with Liu Yi. After all, ordinary people do not have the ability of Liu Yi to turn so many people into craftsmen with good skills.

"The work of nature has opened up things? Is it already a book?" Liu Bei nodded when he heard this. He knew that Liu Yi had been constantly improving this book since many years ago. When he was in Shu, he fought every day. When Liu Yi had time, he would devote himself to writing. Even when he was supervising the construction project, Liu Yi would carry blank bamboo slips with him or write them directly with paper. However, he had never completed it, so Liu Bei didn't know what progress he had reached.

"Yeah." Liu Yi thought about it and felt that this was a good opportunity to advertise. He took out a book from his arms, not like bamboo slips, but a printed version made of paper. The Tiangong opened the goods in total, from easy to difficult, and at the beginning, the first volume was more about basic calculation content.

Liu Yi handed the book to Liu Bei and said, "It's just the first edition, and it may be revised in the future. If the lord has time, give some advice. This is the first volume."

Liu Bei did not refuse, but just looked at the book with curiosity. Liu Yi mentioned the matter about paper books long before the Battle of Chibi. However, Liu Bei and Zhuge Liang always felt that the time was not right, so they did not agree but did not refuse. However, Liu Yi obviously had never stopped. The book in front of him was a book, which made Liu Bei a little curious.

The paper is not the kind of Caihou paper I have seen before. It is not conducive to printing and is not convenient to divide and is easy to stick together. This kind of paper is made by Liu Yi after many experiments and polishing. It is similar to that of later generations. The surface is very bright, and each piece is thick, making it easy to turn pages.

When you open a book, compared to the words on the bamboo slips, the words recorded on the book are laughing a lot. Words as big as a thumb, you can usually put a few pages of the bamboo slips on the top of the previous volume.

The first volume records some numerical operations. Liu Bei also knew that Liu Yi had created a set of symbols to replace the numbers, but he hadn't studied them much. As for the symbols of addition, subtraction, multiplication and division, he didn't understand them even more. At Yuxiang Academy, it was a basic course. At this moment, he took them in front of Liu Bei and looked like a heavenly book.

After a while, Liu Bei rubbed his eyes and looked at Liu Bei with a wry smile and said, "Bo Yuan's book... Bei cannot understand."

Pang Tong took it curiously and looked carefully. He had discussed it with Liu Yi, especially Guan Yu's numbers and symbols. Pang Tong got it with Liu Yi. After looking through it for a while, he wondered: "It's not difficult to understand, it's all basic algorithms for some mathematical techniques."

Liu Bei's face looked a little embarrassed, the air became a little quiet. Liu Yi held his forehead speechlessly and smiled and said with a smile: "It's not that the lord doesn't understand, but the lord doesn't know that these numerical symbols and operation symbols have the meaning of operation symbols, so it's difficult to understand. Lord, in fact, these symbols Yi has other ideas."

Liu Bei took the opportunity to pull the topic away: "Oh? Let's talk about Bo Yuan?"

"Before these numbers have been promoted, they can be used as information transmission. We send detailed works to the Central Plains or Jiangdong, and we can use this symbol to convey information."

Liu Yi took out an Analects from his arms and explained: "For example, only 365 is written in the intelligence, which is the third page, the sixth line and the fifth word. In this way, even if the information we passed on was intercepted by the enemy, they would not know what we meant."

After a long time, it will definitely be cracked. After all, as a detailed work to receive intelligence, you must know the meaning of this thing, but Liu Yi took out the Arabic numerals, which was not intended to serve intelligence.

Liu Bei's eyes lit up when he heard this. If this were put a few years ago, it would definitely not be used. It was just a little bit bigger. What should I do with these fancy things? But now, as the second largest vassal prince today, Liu Bei has become more territorial and has passed the most difficult period of entrepreneurship. Now Liu Bei has begun to gradually formalize his own power and complete some functional institutions that he does not have.

Now, Zhuge Liang did the most in Shu, except for helping Liu Bei manage the rear, in accordance with the Han laws, to establish a set of laws and intelligence that are suitable for the current situation, the actual situation within the Liu Bei group. In the past, Liu Bei did not care much about it, but now, Liu Bei also wants to imitate Cao Cao and establish a special intelligence agency to inquire about information from all parties. Liu Yi's method can be said to be in time.

"Boyuan, how many books are you holding in your arms?" Pang Tong looked at Liu Yi's chest curiously. Although this book is not as bulky as a bamboo slip, the content that a book can record is far more than that of a bamboo slip, it is not a thin piece of paper.

"Just these two books." Liu Yi said: "There are nine volumes in total. In the Yuxiang Academy, for different students, how can I carry all nine volumes with me?"

"Even if this book is just one, there are ten thousand words, right?" Liu Bei asked with a smile, groping through the exquisite books.

"It's almost the same." Liu Yi nodded. He hadn't calculated it before, but he didn't know so much.

"How much does it cost?" Pang Tong asked suddenly.

Liu Yi thought for a while and said, "If such a book is for sale, it will cost about 300 yuan."

As for the cost of construction, it is really not expensive. It costs more than ten yuan. Because it is mass production, there is actually not much handicrafts and materials. But it cannot be sold too cheaply. After all, knowledge and knowledge are very profound and serious things these days. If you take it out for business, some people think it is a defilement of knowledge and sages. If the selling is too cheap, then I am afraid that scholars in the world will not agree. Isn’t this arbitrary person who can buy it?

In fact, if you really want to sell books in this year, no matter how much it costs, just call it in the price when selling it, and you won’t even have to bargain. There will probably be someone who will jump out of the 300 yuan. Liu Yi will probably be dissatisfied with it.

"Are you too despicable?" Pang Tong frowned and looked at Liu Yi. Not only him, but Liu Bei, Guan Yu and others also thought that the price was too cheap. I didn't see Guan Yu holding a book on Spring and Autumn all his life. That treasure was not much worse than the Red Rabbit Horse.

"I think so. The price is this price, but it is only sold internally. Those who have made contributions to the country can buy it, and generals in the military can buy it, and there are limited quantities. In addition, libraries can be set up in various cities, so that some people who are interested in learning can read it, but they cannot be taken away. In addition, if some talents can come to vote, they can also give them books!" Liu Yi thought for a while and said, "It is not possible to promote it directly, so you have to take it slowly. Giving books this year is a very noble gift, and it has a style.

"In this way, we can indeed recruit a lot of talents for the lord!" Pang Tong's eyes lit up when he heard this, and nodded with a smile.

Liu Bei looked at Liu Yi and said, "I wonder how many of these ten thousand words are in Bo Yuan's hands now?"

Liu Yi: "Please take care of it."
Chapter completed!