"Come on, use the chisel to hit this place and leave a mark."

Looking at the dazed looks of Wu and the others, Han Dashenzi, who was very pleased, pretended to be calm and pointed at the mark he had twisted with the wooden stick.

This is the center of the circle. Mark it now to avoid having to find the center again later.

"Ah... OK!"

The wood that was staring at the simple compass in a daze was stunned for a moment, then quickly used a chisel to chisel out an indelible mark here.

Han Cheng used the same method to draw a circle on another stone slab with the same radius as the previous one.

This time, Han Cheng didn't need to say much. Mu Tou consciously used a hammer in one hand and a chisel in the other to chisel out a circle of shallow grooves.

As for the simple compass, it is now in the hands of the witch.

Just like a child who has got a new toy, he leaves circles of different sizes on the ground and never gets tired of it.

Shitou and Bo, two people who wanted to experience this wonderful tool for themselves, waited for a while and saw that Wu was still very interested, so they found ropes and sticks and joined the group drawing circles on the ground.

Not long after, many circles of different sizes appeared on the land of the Qingque tribe.

After these guys finished painting, they stood up to admire them, and laughed foolishly from time to time, obviously very satisfied with their masterpieces.

"These guys have never seen the world." Han Cheng complained in his heart.

'It's just a simple compass, is it really that novel and fun?'

It turns out that a simple compass is just that much fun.

Not long after complaining in his heart, Han Dashenzi also joined the ranks of drawing circles on the ground.

Moreover, his skill in drawing circles with a simple compass was obviously much better than those childish ghosts like Wu, Shitou, and Bo.

The regular pentagonal pattern composed of five semicircular arcs that appeared inside the circle amazed Wu and his friends.

It turns out that in addition to drawing circles, this thing can also draw such complex and beautiful patterns. It's really amazing.

So, with Han Cheng joining the team, the person who originally didn't want to play, immediately became interested again.

Such a simple and interesting tool quickly spread among the Green Bird tribe and was greatly welcomed by these primitive people who were seriously lacking in entertainment activities.

Especially the minors, they were all very happy.

So much so that for a period of time afterwards, circles of all sizes could be seen everywhere inside and outside the Qingque tribe.

Even the walls and the walls of the earthen kang were not spared. It was extremely crazy.

Mu Tou, who was wearing a mask, had been clanging with a hammer and a chisel almost non-stop these days.

As small pieces of stone fell off one by one, a millstone gradually took shape.

Having learned from the lesson of drawing circles last time, Han Cheng did not use wood to make small grooves at the bottom of the millstone. Instead, he used a small wooden board in one hand and a small stone in the other to draw lines of varying lengths.

The wood is then chiseled along these lines.

Of course, these lines are not rays extending from the center of the circle to the edge of the circle. Because after being carved out like this, the grooves become sparser as you go further outside the millstone, and the effect of using it to grind things is not very good, so they are drawn as parallel lines.

It is not easy to draw parallel lines on a circle, except for the method of using the diameter as the center line and then extending to both sides.

The stone mill made using this method is not as good as the radial effect.

Han Cheng's painting method is to divide the circular mill into several parts, and then draw parallel lines in these parts.

The lines between each section are parallel to each other.

In this way, there will be as many grooves on the millstone as possible, and these grooves are not perpendicular to the edge of the millstone, which can avoid the embarrassing situation that the beans are poured into the grinding eye and run out along the grooves before being ground.

It is foreseeable that the clever ancients who first invented the stone mill would not have invented a stone mill like this. Instead, during the process of using it, they constantly discovered the shortcomings of the stone mill and tried every means to improve it, and finally made the stone mill into its current form.

This is the advantage of being a time traveler. You can stand on the shoulders of giants to pick fruits and directly absorb the wisdom that has been continuously improved and passed down from generation to generation by countless people.

Han Cheng is luckier than most time travelers in that he is not unfamiliar with stone mills, thanks to the fact that there was a millstone at home when he was a child.

I have often used peas to make jelly and noodles.

When Han Cheng drew the lines and the wood began to chisel along the lines, the rapeseed could be harvested.

When harvesting rapeseed, you cannot wait until it is fully ripe, but you can start harvesting it as soon as it starts to turn yellow.

The reason for being so anxious is that every plant is a good mother and has a way to let her children leave her arms and survive independently.

Dandelions equip their children with small umbrellas, which can be taken away by a gust of wind. Xanthium puts armor with thin hooks on its children, so that when animals pass by, it can take them far away.

As for pod-bearing plants such as rapeseed and beans, the method they use is sunlight.

When they are ripe, it is easy to crack the pod open and let its children enter the embrace of the soil.

Han Cheng certainly didn't want such a thing to happen. If the rapeseed were allowed to enter the embrace of Mother Earth, all their tribe's work for the year would be in vain.

However, compared with previous years, this year's rapeseed harvesting and subsequent processing were much faster and easier, thanks to the many extra slaves of the Green Bird Tribe.

With everyone working together, the rapeseed was harvested and processed in just a few days.

Then, taking advantage of good weather, they turned over the land where the rapeseed had been harvested and planted late millet.

After the planting of late millet, the planting of soybeans was gradually put on the agenda.

It would be nice if there was wheat.

Han Cheng thought with regret.

If you have wheat, you can rotate wheat and soybeans. The timing is just right and you can harvest two crops a year, which is really wonderful.

Moreover, soybean roots can gather a kind of fertilizer called "nitrogen" that wheat needs. The wheat-bean rotation will not only not reduce wheat production, but will help increase wheat production.

It is somewhat unrealistic to rotate soybeans with millet as their growing seasons conflict with each other.

If you wait until after the millet is harvested before planting beans, the biggest risk is that a frost will come just as the beans are blooming...

It can be rotated with rapeseed, although they are not a very good combination.

Although I thought so in my mind, soybeans did not form a pair with rapeseed this year. The main reason was that the amount of soybeans was too small.

After hesitating for a while, Han Cheng finally kept five pounds of soybeans for making tofu, and planted the rest in the field.

The seeds were not sown, but were planted in the fields using a plow cart pulled by deer.

However, before sowing, you need to pull out the wooden board blocking the hole under the plow cart funnel to enlarge the hole.

Otherwise, one soybean, which is equivalent to many grains of millet, would not leak out.

Even though the warehouse holes were adjusted to be as small as possible and the seeds were sown as little as possible, more than 30 kilograms of soybeans were only planted in more than two acres of land.

This is also due to the small size of soybeans at that time. One soybean is only about one-third the size of soybeans in later generations. If it were the same size as soybeans in later generations, I am afraid that the planting area would be even smaller...Fupin Chinese