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The 9 pages that link to Fountain pen, each with the reason it gives.

• InkRelated: Fountain pens use low-viscosity inks designed to flow through narrow channels.

• Chinese brushCompared with: Its continuous ink supply contrasts with the brush’s variable loading and flexible tip.

• OsmiumBroader topic: Osmium-containing alloys have been used in durable pen nib tips.

• Ballpoint penCompared with: Its nib lays down freer-flowing ink, unlike the ballpoint’s metered rolling transfer.

• Writing instrumentBroader topic: Its reservoir and feed regulate ink flow to the writing tip.

• John J. LoudCompared with: Loud’s ball-and-socket tip was intended to write on surfaces that ordinary nibs handled poorly.

• László BíróCompared with: Bíró’s ballpoint avoided the leaks and smudging that often troubled fountain pens.

• Marker penCompared with: A fountain pen uses a shaped nib and feed rather than a felt or porous tip.

• George Safford ParkerNarrower topic: Parker’s inventions improved this broader class of writing instrument.