Dip pens are so called because unlike the other pens mentioned these pens do not supply their own flow of ink - they have to be dipped into a pot of ink before they are able to make a mark.
Mapping pens or nibs are used for very fine detail only and fine cross-hatching.
The different Gillot nibs are designed to give you a more varied line according to the angle that you hold the pen, and the pressure you apply. The flow of ink to the nib from the dip pen is very different to the flow of other pens. It is less consistent and therefore has to be continuously dipped into the ink to replenish your supply. Dip pens can be used very openly and expressively in the nature of mark making or they can be used very finely.
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