It was already afternoon when the statement was drafted, and Chen Zhaoming and Su Che were also reading and writing. The three of them stayed in the small courtyard all afternoon, and there was no sound or a word to each other.

After almost finishing another five thousand words, Su You put down his pen, grabbed the pair of walnuts on the table that he had grown up with, played with them, and walked out of the study.

I was just immersed in my own thoughts and forgot about the two children in the patio. When I went out, I found two pairs of skates abandoned by the patio. I don't know where they went.

Walking out of the courtyard, I found that two children were pestering Zhang Erwei at the threshing floor. They were very ambitious and wanted to turn the entire playground and threshing floor into a big skating rink.

Su You called the two children over: "You have to be efficient when doing things. We can't be idle while Uncle Zhang is making the fence."

Bian Gu ran over: "Dad, what are we doing?"

Su You took the colander from Mrs. Zhang who was watching the excitement and hugged it: "Your task is to complete a small water wheel, but you can also automatically draw water from the ditch to pour out the ice rink.

.”

Bian Guan tilted his head and thought for a moment: "The kind of water-powered overturning in the Southwest Farming Book?"

"Hey!" Su You smiled: "Have you ever read Daddy's book? That's right, but I'd like to remind you that I can make a simplified version, as long as it works. I see there are a lot of bamboo shoot shells burning in the woodshed.

…”

"Thank you, daddy!" Bian Guan was also very smart in this regard and pulled Wang Yanbi away.

With bamboo shoot shells, bamboo sticks, pig-chopping knives, scissors, and thin hemp rope, the two children set up a battlefield on the millstone next to the house.

As long as the requirements are not too high, this craft is actually simple. The flat pot and Wang Yanbi's little head came together to change the round wheel into a hexagon, and then used bamboo shoot shells as paddles to drive the inclined bamboo tube tied to the wheel.

After a while a rough little waterwheel was ready.

Putting it on the ditch, the waterwheel was washed away by the current.

Seeing the water brought out of the bamboo tube being directed by the cut bamboo tube to the threshing floor, Zhang Er was a little surprised: "The two young masters are really smart!"

Wang Yanbi added a large bamboo shoot shell to one end of the bamboo trough. Now almost all the water was caught, and the water flow in the trough suddenly became much larger.

"Yes!" Bian Guan and Wang Yanbi were extremely excited: "Success!"

The colander also followed his brother and clapped his hands excitedly: "Yes!"

Su You was also very happy. He thought of changing the waterwheel frame from a circle to a hexagon for easier production. In fact, in the simplest way, he used hemp rope to build the waterwheel using the principle of the most stable equilateral triangle.

It shows that the two children are actually thinking hard, and it also shows that they have a solid foundation in mathematics.

One is eight years old and the other is six years old. Hahaha, Sima Junshi and Wen Xianggong, you may be compared in future history books...

After the first one was made, the second one was easy. Wang Yanbi and Bian Gu made several more and placed them in a row along the ditch.

While eating, Bian Gu kept thinking about the skating rink: "When will this be filled?"

After eating, Su You found three wooden sticks and said, "Aren't you worried about when it will be filled? Then let's measure it and calculate it."

Bian Guan and Wang Yanbi were both curious: "How to measure?"

Su You went to the tool room and took out a long ruler, measured out a one-meter-long rope, tied rope loops on both ends, put wooden sticks on them and stretched them out.

Open it to the maximum position and place it on the ground, then cross the tops of the sticks, let Wang Yanbi hold on to them, and tie them up with ropes.

Bian Guan probably noticed something: "Daddy, are you going to make a big compass?"

Su You smiled and said: "Exactly!"

Next, let the two children grab the bottom and tighten the rope, tie the third wooden stick to the two wooden sticks, and use the principle of triangle stability to make a foot rule with a distance of one meter between the two feet.

With this, you can flip it while walking, which is an "artifact" for calculating land area.

This is also fun. The threshing floor is a rectangle, so you can calculate the area and then the volume.

This involves hands-on work, measurement, and calculation, and the two children are very interested in it.

Su You drew a schematic diagram, inspiring the children to learn to calculate volume on their own, and then sent them to measure.

When the measurement came back, Su You had already vacated one of his book boxes: "With this contribution, I will make a measuring tool for you. Use it to collect water and record the time of collecting water. Can you calculate how much water a water truck can produce in one minute?"

How much water do you draw?”

"Multiplying the number of water trucks, does that mean how much water the water trucks can provide to the ice rink per minute?"

"Based on the ice thickness of five centimeters, we can calculate the total amount of water required for this large ice rink, and then divide it by the amount of water drawn by the water tankers per minute. Can we calculate the time it will take to build this ice rink?"

This is a calculation question about multiplication and division. Bian Guan and Wang Yanbi have done a lot of calculations on weekdays, but this is their first time to apply it in a serious way.

Putting their knowledge to use, the two children carried the small book box away with great interest.

After struggling for a long time, I finally figured out that it would take about eight hours to turn the playground into an ice rink.

Su You checked their calculation results and said with a smile: "The error in this measurement is actually very large, but no matter how large it is, it can only take half a day. So tomorrow morning, the ice rink will be completed."

When they woke up the next morning, Bian Guan and Wang Yanbi opened the door: "Wow"

A large ice rink has been built.

Su You walked out of the door: "You did a very good job, there are only a few small details that I didn't notice."

"There is warm water in the ditch. If we keep irrigating it, the water temperature near the water wheel will not cool down, and the ice rink will not be able to form."

"And how will people walk when the entire playground is occupied? Therefore, sacks must be laid around the ice rink to facilitate walking."

When Bian Guan saw that all these things had been set up: "Then who helped us do it last night?"

Su You said: "Perhaps your love for learning and exploration moved the gods, and they came to help you two in the middle of the night?"

Bian Guo hugged his father and said, "Daddy lied. You must have gotten up in the middle of the night and did it secretly, right? Thank you, dad."

Su You couldn't help lamenting: "Bian Guan, your science and engineering attributes are too strong, I'm afraid there will be problems in liberal arts in the future..."

But the rules are rules, and you still have to practice morning exercises, especially Zhang Er, who said that practicing in the winter, practicing in the summer, and practicing in the summer are the best times to hone your will.

Su You's attempt to exchange the credit for the skating rink for Ping Gu's magnanimity failed.

After breakfast, the children played on the skating rink. Only two children have skates now, but Su You used bamboo chairs to make several ice plows. There is also a lathe on the farm, and it is a wooden top.

relax and happy.

Knocking a round-headed nail into the bottom of the top, placing it on the ice and pulling it with a leather rope is not an ordinary fun thing.

This was enough, Su You also found oil paints and let the children color their own tops. Once they were drawn, the colors mixed together, which was a magical experience.

The children were playing crazy on the ice, the men were busy clearing ponds and driving pigs, and the women were busy smoking and drying fish.

Entering the winter month, there are many things to prepare for the New Year. There are many pigs in Sujiazhuang, so killing the New Year pigs is also a big event, so it should be done sooner rather than later.

Zhuangzi sells fat black pigs. Some families are so afraid of poverty that they raise pigs but are reluctant to kill them. As a result, after the New Year, the pigs grow to more than 300 kilograms.

In the end, the family failed to make a living, so the magistrate bought him for thirty guan and sent it to the capital as an auspicious sign.

We can't do that stupid thing again this year. Hachiko waved his hand and his tone was full of violence, coldness and cruelty: "Kill, kill from house to house!"

There is no need to hire outsiders to kill pigs in Sujia Zhuang. All the men in charge of the village have dozens of lives in their hands, so there is no psychological pressure to kill a pig.

So there is another big thing today, which is to put down the ten fat pigs raised by Hachigong.

The big pigs screamed at the top of their lungs, so Su You couldn't continue writing the article, so he just came out of the house to watch the fun together.

The big black pig was tied up and placed on a bench. Zhang Er stepped forward and pulled out the sharp knife from his waist. He drew it back under his neck, and a bloody arrow shot out and sprayed into the wooden barrel that he had prepared.
Chapter completed!