Ballpoint Pens

Ballpoint pens were invented in the 1940s, although earlier efforts to design them dated back to the 1800s. By the 1950s they'd become standard technology, displacing the traditional fountain pen. Ballpoint pens dispense their ink via the rolling action of a small metal sphere or ball at the tip, rather than a nib.

At the end of World War Two, Eversharp produced one of the first commercial ballpoint pens, called the Eversharp CA for capillary action. Reynolds followed suit with a ballpoint pen called the Reynolds Rocket. These two pens were sold for the same price as high-end fountain pens, and both failed because they had problems with leaking...