In p>177, the British scientist Joseph Priestley said, "I saw a substance that is very suitable for erasing pencil handwriting.
At that time, rubber particles cut into small cubes were used all over Europe to wipe away handwriting. This substance is called an eraser.
Edward Naime, another British engineer, is regarded as the inventor of the eraser, also in 177. Before that, people used bread crumbs to wipe away handwriting. Naime said that he accidentally picked up a piece of rubber as bread crumbs once, but found that it worked well, 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 Charles Goodyear 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. However, this pencil with an eraser was later revoked because it was judged as "only embedding two existing things together, not a new product".
English name of eraser
In Britain and Australia, eraser is called rubber；; But in America, rubber is one of the common names of condoms, and the name of eraser is Eraser. This distinction is often used by Americans as a joke.
There are many kinds of erasers today to meet different needs.
Some pencils have a small eraser at the end. Most of these erasers are pink, and the surface is smooth gum. They perform well on most occasions, but sometimes they get stuck on paper. If the force is too heavy, the eraser still has a chance to break the paper. When the handwriting is erased, the eraser will leave residue on the paper. If it is not cleaned properly, these residues will leave marks on the paper.
Another kind of eraser is the brown eraser commonly used by artists, which is made of soft and rough rubber. Its design is convenient for erasing large areas of traces and will not break the paper. But this eraser can't erase handwriting effectively and accurately.
Another eraser commonly used by artists is called a soft eraser. It is mainly made of a gray material and rubber with gum. Its strength makes it leave no residue, so its life is longer than other erasers. It removes handwriting by "absorbing" graphite. This eraser can not only erase handwriting (in fact, it can accurately remove handwriting), but also be used to highlight important parts or make works more detailed. However, it is not good at removing large areas of handwriting, and if it is excessively heated, it will stain or even stick to the paper.
The soft polyethylene-based eraser has the texture of plastic and has the same function as the ordinary pink eraser. These erasers are softer than pink erasers, so they are less likely to damage paper. Polyvinyl erasers are generally white.