High Quality Content by WIKIPEDIA articles! A ballpoint pen is a modern writing instrument. A ballpoint pen has an internal chamber filled with a viscous ink that is dispensed at tip during use by the rolling action of a small metal sphere 0.7 mm to 1.2 mm in diameter of brass, steel or tungsten carbide. The manufacture of economical, reliable ballpoint pens resulted from a combination of experimentation, modern chemistry, and the precision manufacturing capabilities of 20th century technology. Many patents worldwide are testaments to failed attempts to make these pens commercially viable and widely available. The ballpoint pen went through several failures in design throughout its early stages. It has even been argued that a design by Galileo Galilei , was that of a ballpoint pen[citation needed]. The first patent on a ballpoint pen was issued on 30 October 1888, to John Loud, a leather tanner, who was attempting to make a writing implement that would be able to write on the leather he tanned, which the then-common fountain pen couldn't do. The pen had a rotating small steel ball, held in place by a socket.

Данное издание не является оригинальным. Книга печатается по технологии принт-он-деманд после получения заказа.