In the pencil case, there must be an eraser, which can erase the wrong pencil words and help us correct our mistakes. Who invented this very good stationery?

Eraser can erase pencil words, which was first discovered by British scientist Priest in 177. Before this, people used bread to wipe pencils. Priest's discovery caused a great sensation because it brought great convenience to people. However, the earliest eraser was made of natural rubber. When erasing words, it didn't drop crumbs. It just stuck the end of the pencil on the eraser, and the more it was rubbed, the dirtier it became. Later, when people made erasers, they added substances such as sulfur and oil, which made the erasers easy to lose crumbs. The erased pencil scraps left the erasers with the crumbs, so that the erasers could always be kept clean and the leaves would not stain the paper.

In p>177, the British scientist Joseph Priestley said, "I saw a substance that is very suitable for erasing pencil handwriting."

eraser

At that time, rubber particles cut into small cubes were used to erase handwriting all over Europe, and this substance was called eraser.

EdwardNaime, another British engineer, is regarded as the inventor of the eraser, also in 177. Before that, people used sponges to wipe away handwriting. Naime said that he once picked up a rubber eraser by accident and found that it had a good effect, so he began to produce and sell erasers.

the initial eraser is not convenient, because raw rubber is easy to rot. It was not until 1839 that the inventor CharlesGoodyear discovered that vulcanization could improve the quality of rubber, and the eraser became reliable.

In p>1858, a man from Philadelphia, USA, obtained a patent for embedding an eraser in the tail of a pencil, but later the patent of this pencil with an eraser was revoked because it was judged as "just embedding two existing things together instead of a new product".