A fountain pen is a pen that contains a reservoir of water-based liquid ink. If it uses ink cartridges instead of having a built-in ink reservoir, it is often called cartridge pen. From the reservoir or the ink cartridge, the ink is drawn through a feed to the nib and then to the paper via a combination of gravity and capillary action, so most fountain pens require no pressure to write.

Filling the built-in reservoir with ink usually involves operating an internal mechanism which sucks ink from a bottle through the nib into the reservoir. These mechanisms are typically pistons or rubber sacs. Cartridge pens are filled by simply replacing the empty ink cartridge with a new factory-filled one.

History

In his Deliciae Physico-Mathematicae (1636), German inventor Daniel Schwenter described a pen made from two quills. One quill served as a reservoir for ink inside the other quill. The ink was sealed inside the quill with cork. Ink was squeezed through a small hole to the writing point. Progress in developing a reliable pen was slow, however, into the mid-19th century. That slow pace of progress was due to a very imperfect understanding of the role that air pressure played in the operation of the pens and because most inks were highly corrosive and full of sedimentary inclusions. The Romanian inventor Petrache Poenaru received a French patent for the invention of the first fountain pen with a replaceable ink cartridge on May 25, 1827. The design of the pen allowed for smooth writing without unwanted dripping or scratching. Starting in the 1850s there was a steadily accelerating stream of fountain pen patents and pens in production. It was only after three key inventions were in place, however, that the fountain pen became a widely popular writing instrument. Those inventions were the iridium-tipped gold nib, hard rubber, and free-flowing ink.

The first fountain pens making use of all these key ingredients appeared in the 1850s. In the 1870s Duncan MacKinnon, a Canadian living in New York City, and Alonzo T. Cross of Providence, Rhode Island created stylographic pens with a hollow, tubular nib and a wire acting as a valve. Stylographic pens are now used mostly for drafting and technical drawing but were very popular in the decade beginning in 1875. It was in the 1880s that the era of the mass-produced fountain pen finally began. The dominant American producers in this pioneer era were Waterman, using a design based on that of Poenaru, and Wirt, based in New York City and Bloomsburg, Pennsylvania, respectively. Waterman soon outstripped Wirt, along with the many companies that sprang up to fill the new and growing fountain pen market, and remained the market leader up until the early 1920s.