Pens {fountain pen}| can have rubber sacs to hold ink or have replaceable ink cartridges. From ink sac, a capillary tube leads to point {nib, pen}. Nib is flexible and has a split down middle lengthwise. Slit acts like a capillary tube to draw ink forward. Plastic under point {comb, pen} stores ink. Pressure or temperature change forces ink out reservoir.
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Date Modified: 2022.0224