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obtained a patent for embedding an eraser in the tail of a pencil, but later the patent of this pencil with an eraser was revoked because it was judged as "just embedding two existing things together instead of a new product".