What did Lu Ban invent?

2. Be good at collecting information.

3. Raise perceptual knowledge to the space of rational knowledge.

4, invention is people-oriented, in order to facilitate life and transform life, rather than pursuing luxury nothingness.

The legend of inventing the saw:

It is said that the saw used by carpenters was invented by Lu Ban. There is no saw, but the carpenter saws wood with an axe. Once, Lu Ban was working on the mountain, and suddenly his hand was cut by something, bleeding profusely.

He looked for it, and it turned out to be a silk thatch with many hard and sharp teeth on it, which bit people's flesh. Lu Ban was inspired by this: If you make a toothed strip out of metal, can't you see the wood?

Therefore, Lu Ban invented and manufactured the metal saw. Archaeological data show that there was a serrated clam sickle in primitive society in China and a small copper saw in Shang Dynasty. )

Extended data:

Luban bridge

In Luzhai Village, Luban's hometown, there is a big river in front of the village, which makes it inconvenient for villagers to get in and out. So, the craftsmen in the village decided to build a bridge to facilitate the villagers' travel.

However, these craftsmen usually have a problem, that is, they are stupid and not serious. One day, an old man with a white beard came and has been wandering around the construction site.

Later, a villager was curious about the old man, so he often gave him something to eat and invited him to live at home at night. So the old man said to his family, "I have nothing to give you." Let's make a nest for you. "

The old man is really careful when he hits the nest. He weighed the beating and did not dare to be careless. The craftsmen who built the bridge laughed at him: "Does it take so much effort to make a lion's nest?"

Who knows, when the bridge was closed, a stone was just missing, and it could not be done well for a while. The more you worry, the less beautiful it will be. Dark clouds are gathering and it will rain heavily.

If the stone arch bridge can't close the Longmen, then these months of work will be in vain! Just then, the old man with white beard came over and said, "Don't worry, let's see if the stone clam nest I made is suitable."

Masons go in and out in the middle, exactly the same. Where are the shadows when craftsmen ask the old man to thank them? Only a piece of paper was left, which read: "careless construction, the arch of the bridge was off."

In return, Luban returned to his hometown. "This just know is ruban grandpa apparition! Since then, the craftsmen here have never been careless in their work.

Baidu Encyclopedia-Legend of Luban