A drawing toy I played as a child, a big circle with teeth, put different small circles in it, and you can draw different cases with a pen. What toy is it?

The flower curve gauge (ruler), also called Wan Huachi, is an intellectual toy, which consists of a mother ruler and a child ruler.

There are serrations on the female ruler and the female ruler. Slightly different, the female ruler is the inner gear ring and the female ruler is the outer gear ring. There are many small holes of different sizes and positions on the sub-teeth. In addition, there are many changes in the shape of the ruler, except for circle, ellipse, triangle, cross, plum blossom, square, polygon and so on.

Female rulers have not changed much, but some female rulers also have gears on their outer edges. When the female ruler is placed on the outer edge of the female ruler for circular motion, a flower-shaped circle is drawn. The inner circle of a female ruler is usually round and oval. Put the big gear close to the paper, put a small gear in, insert the pen tip into a hole in the small gear, and let the big and small gears mesh and run. At this time, the pen tip will draw many beautiful curve patterns on the paper.

Fan Hua curve gauge

Fan Hua curve

Extended data:

There is no record about the founder of Fan Hua Curve in authoritative materials, but it is introduced in Super Brain (20 18-0 1-26). The founder of Fan Hua Curve is Mr. Yang Binglie, who has passed away. His son Wu Wenjie, who was in Fan Hua Curve, was invited to the program. In fact, the flower curve is also used in RMB. The state wants to give Mr. Yang a patent, but Mr. Wang is too troublesome to apply. This also confirms from the side why authoritative materials are not recorded.

It is reported that Mr. Yang Binglie likes to eat evergreen biscuits. Once he turned the lid over, he found that the hole in the biscuit flowed regularly. He got inspiration from it and began to learn. He is also the first backbone of Shanghai University of Science and Technology. As the first person to win the national invention award, he struggled in the forefront of scientific and technological inventions all his life.

Mr. Yang Binglie invented 12 sets of flower curve gauges, and the last three sets were designed by his son Wu Wenjie. He once said, "The key point of the flower curve is not how long it takes to design each set, but that each set should be innovative." "What I invented and created does not belong to individuals, but to all mankind."

Mr. Yang Binglie

Evergreen biscuit

References:

Baidu encyclopedia-flower curve gauge