In the Middle Ages, people wrote with lead and silver sticks (to be exact, lettering), and in the15th century, Italy made the first lead-tin refill.
/kloc-graphite ore was discovered in England in 0/658, and pens made from it are very expensive.
Joseph Hartems (born on February 20th, 1752), the inventor of the pencil, is a carpenter in Aspell. Hardtmuth studied the bricklayer's craft in Vienna, later became an architect, and once founded a brick factory.
At that time, the pen used for writing was of poor quality, and he was determined to invent a new pen. He came up with an idea: mix clay with graphite powder, make it into the shape of a refill, and burn it in the fire, so that you can draw traces on the paper. He added a proper proportion of clay to graphite powder to make pencil lead have a certain hardness. 1792, he set up his own pencil factory in Vienna, and still produces pencils today.
Mechanical pencil was invented by Japanese pen collector Syunichi Nakata.
At that time, there was a celluloid note-taking tool called a living pencil, but it was too thick, unsightly, easy to break and poor in practicality. Hayakawa entrepreneurs are keen to change the structure and packaging by using their own metal processing technology, and finally completed a solid and beautiful nickel pencil in 19 15. This kind of pencil is called Hayakawa-style movable core pencil and has applied for a patent. Sold under the names of spiral pencils and mechanical pencil.
3. The information about the inventor of the eraser is as follows:
1770, British scientist joseph priestley discovered that rubber particles can erase pencil handwriting. Meanwhile, Edward Gnehm, a British engineer, is regarded as the inventor of the eraser. Before that, people used bread crumbs to erase handwriting. Naimei said that once he accidentally picked up a rubber as bread crumbs, but found that the effect was very good, so he began to produce and sell rubber.
At first, 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.
1858 Lippmann of Philadelphia, USA, obtained a patent for embedding an eraser at the end of a pencil, but the patent was later revoked.