John J. Loud, an American, received the first patent for a ballpoint pen in 1888. However, it was not commercially successful and eventually his patent expired. László Bíró, a lawyer and occasional inventor from Hungary, wanted a pen that could write on rough materials as well as paper. He made significant improvements to the design and invented a practical ballpoint pen, which appeared in 1943. Bíró's frustration with fountain pens, which required constant refilling and often caused smudges, led him to create a pen using fast-drying ink similar to newsprint ink, which wouldn't flow from a normal pen nib. Helped by his brother Georg, Bíró devised a roller-ball tip with a tiny ball-bearing that would roll over the paper surface, picking up ink from the ink cartridge inside and applying it to the paper on the outside. While on holiday, the Bíró brothers met an amiable old man who suggested they try to market the pen in Argentina. The RAF had meanwhile taken up their idea because ...
Could you provide the title of the video? Also, it would be a good idea to provide a link.
ReplyDeleteSpherical houses weren't a great idea.
ReplyDeletelink
https://www.youtube.com/watch?v=3kwDVw0u4Kw