Introduction
Ballpoint pen, also called biro, after its founder, Laszlo Biro, is a writing tool that has a small ball bearing for the transfer of the stored in a cartridge onto the writing surface. Its internal chamber is filled with an ink which flows to the tip as a result of the rolling action of its major parts. Its sphere is made of carbide, steel, brass, tungsten or any other non deformable durable material with a diameter ranging from 0.5- 1.2 mm. the popularity of this pen has grown due to the various improvements it has witnessed since its invention. It’s made up of ...
