<P> A fountain pen is a nib pen that, unlike its predecessor, the dip pen, contains an internal reservoir of liquid ink . The pen draws ink from the reservoir through a feed to the nib and deposits it on paper via a combination of gravity and capillary action . Filling the reservoir with ink may be achieved manually, via the use of a Pasteur pipette (eyedropper) or syringe, or via an internal filling mechanism which creates suction (for example, through a piston mechanism) to transfer ink directly through the nib into the reservoir . Some pens employ removable reservoirs in the form of pre-filled ink cartridges . </P> <P> An early historical mention of what appears to be a reservoir pen dates back to the 10th century . According to Al - Qadi al - Nu'man (d . 974) in his Kitab al - Majalis wa' l - musayarat, the Fatimid caliph Al - Mu'izz li - Din Allah demanded a pen that would not stain his hands or clothes, and was provided with a pen that held ink in a reservoir, allowing it to be held upside - down without leaking . </P>

Explain how a fountain pen is filled with ink
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