In ancient China, people used stone caves, stone mills and stone mills to process grain. Including these three things, Shiwozi is the earliest thing. Punch the hollow in the stone, then put the grain on it and hit it with a thick wooden stick, but this thing is tired and hard. With the passage of time, Master Luban, the originator of carpenters, invented the stone mill and relieved people's suffering. Baotian stone mill also appeared at the same time, which is even a labor-saving large-scale grain processing tool.

So, why do stone mills and grinders in China run counterclockwise? The reason for this is not profound. Old people know because they have used it, but modern young people don't know why. There is a central axis on one side of the tooth. There is a cave on the round edge of the hanging stone. Used for installing wooden rotary handle. There is an egg-thick stone hole on the surface of the upper plate. There is a concave hole in the center of the tooth side. As long as the convex surface and the concave surface are connected together, the rotary handle will rotate.

This kind of stone mill turns against time, and the teeth are meshed. When inverted, particles can be broken and turned into powder. If you turn it clockwise, it will not only be laborious, but also damage the tartar teeth. The more important question is why do we reverse time? In fact, it depends on human's right and left hands. Generally speaking, the left hand pulls the millstone forward and the right hand feeds the grain into the stone eye. The speed can be adjusted in reverse. When the feeding eyes reach the front, the right hand can feed food even if it turns half a turn. After turning clockwise, the right hand will touch the left hand, and even the handle will jam the right hand. This is the reason why the stone mill is reversed.

Even the stone mill is upside down. It follows the principles of the mill. Actually, clockwise rotation is ok. Just because people are used to grinding, the direction of grinding is naturally the same as that of grinding.

With the development and progress of society, some things gradually disappear in our sight, which is the result of historical development. Many ancient handicrafts we know are disappearing. They gradually disappear from our lives, become masterpieces and become beautiful memories of our childhood.