Time flies, and the cold wind of winter blows on Gu Guo's cheeks again.

His tribe is like being fast-forwarded, from nothing last year to now building a city, and the changes are earth-shattering.

The prey that people catch and the fish they catch are preferentially hung in front of their houses, kneaded with salt on the surface of the raw meat, and stored in neat rows in clay jars.

After technical exchanges with the Yangya tribe, Hongmei is now able to burn large clay jars with a volume of nearly one cubic meter, and two are allocated to each room, one for water and one for food.

The beams of each room are covered with smoked bacon, and on the exterior walls are rows of sun-dried salted fish.

With plenty of food for the winter, you can free up some manpower.

Gu Guo stood on the edge of the Tao River, where a group of clansmen were assembling the wheels of a waterwheel.

With the bronze casting technology, plain bearings were immediately used in trolleys. After many failures, he finally came up with a sleeve for the waterwheel, which matched the gap between the bronze shaft body, which was much more difficult than making the bearing of the trolley.

The length of the spokes alone is three meters, and when the entire wheel is completed, it will reach a staggering seven meters in height, except for the unfinished sailboat, which should be the tallest building at the moment.

Xiao Feng held a bronze ruler and used a protractor to determine the spacing angle of the two spokes, while Gu Guo stood aside as a supervisor.

Because Professor Gu Guo's curriculum only focuses on arithmetic and literacy, and the children's ability to accept it is much faster than that of adults, and now the children in the tribe have basically reached the level of the third grade of primary school.

No matter what the era, there is no shortage of those who are smart. A child like Xiao Feng who is a big step ahead of others, there are several in Gu Guo's tribe.

They were all assigned to various positions such as shipbuilding and trench digging to accumulate practical experience.

Gu Guo can't always do it himself in the future, he feels that he is not as good as Emperor Chongzhen, and now it is already very difficult to manage a tribe of more than 300 people, and when the time comes, it will develop into a city-state that integrates thousands of people, and these children who have learned will have to be used to manage.

According to the management model of Anshan Iron and Steel, Gu Guo first let these future cadres participate in labor first, and then participate in management when the knowledge level of the people who work full-time in the future improves.

At the same time as the construction of the waterwheel, the construction of the aerial canal was also under way, stretching from the Tao River to two kilometers away, and the amount of work was comparable to that of the construction of the city wall.

This is a two-kilometer-long canal with an east-west drop of nearly five meters, which is undoubtedly a big challenge for Gui, who lacks measuring tools.

Gui is from the tribe of Sang, two years older than Xiao Feng, after more than half a year of studying arithmetic, his knowledge level far exceeds that of his peers, even Gu Guo wants to give him the title of genius.

The transition from a hungry meal to a full meal made the young Gui understand the importance of knowledge. The bow and arrow that uses elastic potential energy is an extension of the human arm, and the birch bark boat that discharges the water to gain buoyancy is the key to obtaining fish, and Professor Gu Guo's knowledge can always make life better.

However, the construction of the canal made it difficult for him to achieve a drop of five meters over a length of two kilometers, and he first had to determine the end point of the canal, that is, the position of the waterwheel as the starting point, and the extension of the ray in the direction of the Tao River at an angle of 90 degrees.

Two millimeter-accurate rulers and protractors were used by Kaede and another of his peers to build waterwheels and sailboats. The length of several line segments and simple trigonometric functions painted by Gui on the ground are not as simple as imagined when applied to reality.

He measured a ten-meter-long rope with a standard meter ruler cast in bronze, used the method of surveying and mapping the city wall, determined the straightness of the line extension at three points and one line, and drove a wooden stake every ten meters, using the stupid method used by Gu Guo.

Because it's just a straight line, the error won't be too big.

However, the trend of the canal in the east and the west is the difficulty, and this trend must be coherent, otherwise the water flow is easy to accumulate in one place, affecting the efficiency of the water flow.

While Gui was still struggling with similar triangles, Xiao Feng also encountered problems on his side.

The hubs and spokes of the waterwheel have been installed, and the mortise and tenon structure with bronze nails firmly combine the wooden structures one by one, and the base up to four meters high is buried deep in the ground, but because there are no cranes in this era, how to install huge wooden wheels makes Xiao Feng scratch a lot of hair.

Gu Guo just looked at his sister with a sad face with a smile, and said, "Xiao Feng, your arithmetic is enough for you to solve this kind of problem, plus the physics knowledge I just taught you, whether it is with a pulley or a lever, there is always a way to put a waterwheel wheel on a bronze shaft." ”

Pinched Xiao Feng's bulging face, Gu Guo walked away

Now that he is the shopkeeper, he finally realizes the true feeling of the leader moving his mouth and breaking his leg below.

The party before the winter was naturally set in Gu Guo's city, and with a warm kang, who would do that kind of thing in the wild? Moreover, Gu Guo would also provide a certain amount of food, which made the remaining ten or so tribes firm in their desire to settle here. Those who often come to trade, although they still live in the cave, their hearts have already stayed in the city of Gu Guo.

The popularity of simplified Chinese characters and Arabic numerals has made this group of people inseparable from the cultural circle centered on the Gu tribe.

On the four walls of the houses in the city, you can always see propaganda slogans such as "knowledge changes life" and "labor is the most glorious", which are thousands of years ahead of this era.

Some of the people of the slogan are like being enlightened after reading it, while others are accustomed to it. For example, when Gu Guo wrote on the wall that labor was the most glorious, Huaihua, who was also writing according to the gourd painting on the side, muttered: "If you don't work, you won't eat!" ”

Gu Guo realized that he had brought modern thinking into this life that had just crossed over to the Bronze Age, although he always deliberately maintained the optimal management model and propaganda methods under the current productivity, but people always make mistakes.

But instead of erasing the slogan, he copied it in every room.

In the future, after the city-state is built and the social productive forces have taken a step upward, classes will inevitably be born among people due to the surplus of materials.

And the existence of this slogan, although those in the upper class are not engaged in production, they will never openly look down on those working people at the bottom.

The people hated the work of digging dung, but under the influence of this slogan, they would not look down on those workers who were digging dung full-time, and if one day the man who digs dung was unable to work due to illness, then the person who replaced him would only be praised more than belittled.