But use fresh bread to erase the pencil words, because fresh bread is soft and contains a proper amount of water, so it is easy to remove the pencil words. Sometimes we can see such an incomprehensible scene in movies set in the European events more than 200 years ago: on the writing desk, with a pencil, there is a small plate with a small piece of fresh bread in it. Readers now understand that bread here is not food, but a cultural commodity, so it is natural to put it on the desk. However, bread is not a pleasant cultural product-a piece of bread will turn into crumbs after a few rubs.
"What a nuisance, this damn crumb!" 1one day in the summer of 770, priestley, a 37-year-old British chemist, was drafting an experimental report. The report is very long, and the servant has used up some fresh bread for him. He had to use yesterday's leftover bread to make breadcrumbed report paper, which looked like food wrapping paper. Coupled with the hot weather, Priestley's hands are sweaty. When he touched the paper, the crumbs were in his hand, which made him very uneasy.
Trouble and hot weather made priestley dizzy. He reached for a small glass bottle full of smelling salts, pulled out the rubber stopper and put it under his nose, trying to wake himself up. Sure enough, smelling salt made his mind clear and his troubles seemed less. Priestley looked at this little rubber cork in his hand with great interest.
Don't underestimate the ugly little rubber stopper in priestley's hand. At that time, it was a fashionable luxury that came out soon.
Since Columbus discovered rubber in Haiti in 1493, people have been unable to find practical use for this wonderful substance for more than 200 years. So it can only be put in the museum as a "novelty brought back by Columbus" for people to watch.
1763, the Frenchman Melka came up with a purpose of rubber: to make it into a small bottle stopper, which is light and sealed. At that time, the European upper class advocated being unconventional, and Moka's gizmos were soon brought. At one time, most of the small salt smelling bottles carried by the upper class were replaced by rubber stoppers from Moka.
Priestley gently rubbed the soft and elastic cork in his hand, and inadvertently found that his fingers were rubbed very clean, and the black pencil powder stained when writing a report just now was also wiped off. Naturally, an idea flashed through his mind: try to erase pencil words with this interesting little thing. Try it, and sure enough, the pencil handwriting is easy to erase, and the paper is clean, leaving almost no trace.
Priestley couldn't help being excited about his discovery. He immediately stopped writing the experimental report and wrote a letter to the Frenchman Moka ... I ask you to customize 500 pieces of flat rubber for me ... "
These 500 flat erasers are the earliest batch of erasers. Priestley showed them to relatives and friends and asked them to try "this is an interesting gadget that can erase pencil handwriting". Soon, this thing became popular in the upper class, and people called it "a wonderful invention, and the words disappeared as soon as they were erased." Because people didn't know what to call it at that time, they could only call it "wipe" according to its purpose. Until now, "eraser" and "eraser" are still the same word in English.
Later, priestley devoted himself to the study of gases, discovered important gases such as oxygen, and became a famous chemist. Over time, people only remember his brilliant chemical achievements, but almost forget his contribution to the invention of rubber.
/kloc-After the birth of rubber 0/00 years ago, American painter Leapman made a small innovation on it.
Leapman likes to start with a pencil when painting oil paintings. He is quite careless and often leaves his eraser everywhere until he doesn't know where to find it when he uses it. Many searching experiences gave him an idea: wouldn't it be nice to connect the eraser with the pencil? So he tied the eraser to the pencil rod with a rope. This way is very convenient to use, but that small piece of rubber is always dangling in front of people, which makes people very uncomfortable. So he clamped the eraser on the pencil head with a thin iron sheet. Later, Leapman, who was very economic-minded, applied for a patent for a small invention that he was very satisfied with, that is, the ordinary rubber-tipped pencil used today.