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Fountain pen is the name given to a variety of pen which modification of the pen made of straws, reeds or wing feathers that required the pen to be dipped in ink for writing. In contrast to such dip pen, the fountain pen are designed to supply ink for writing from a reservoirs of ink that is an integral part of the pen. A modern fountain pen typically consists of a metallic nib surrounding partially or fully a core of material like plastic, and both these parts inserted in to cylindrical hole that connects the rear of the nib and the core to a ink reservoir.
The ink is supplied from the reservoir to the nib in controlled quantity using capillary action. Simultaneously, suitable passage in the core allows air to pass into the ink reservoir to fill the void created by the ink used up in writing.
The nib is shaped suitably for smooth writing and is split near the tip for assisting the capillary flow of the ink.
The fountain pen typically use liquid ink. Subsequently ball pen were developed that use thick viscous ink. Also, towards end of twentieth century, pens with soft nibs were developed that use a highly absorbent fibrous material soaked in ink as source of ink rather than just a plain ink reservoir.
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