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The final stretch of the path is made by the ink by capillarity, passing through the channel in the slit between the two wings of the nib until it reaches the tip, and it is this same capillarity that holds it and prevents it from pouring. But as soon as you place the tip of the nib on a sheet of paper (or another suitable surface), it is the same surface tension, applied this time also to the contact between the tip and the paper, which causes the ink to deposit on the latter and continue to flow as you write through the [[slit]], at least until (in the case of flexible nibs) you press too much widening it too, so as to interrupt the effect of capillarity and the consequent flow of ink.

The final stretch of the path is made by the ink by capillarity, passing through the channel in the slit between the two wings of the nib until it reaches the tip, and it is this same capillarity that holds it and prevents it from pouring. But as soon as you place the tip of the nib on a sheet of paper (or another suitable surface), it is the same surface tension, applied this time also to the contact between the tip and the paper, which causes the ink to deposit on the latter and continue to flow as you write through the [[slit]], at least until (in the case of flexible nibs) you press too much widening it too, so as to interrupt the effect of capillarity and the consequent flow of ink.

E' questo equilibrio di forze che mantiene il flusso di inchiostro fintanto che si mantiene il contatto col foglio, anche se questo in genere non causa macchie per via della scarsa porosità della carta da scrittura che una volta bagnata superficialmente non assorbe altro inchiostro; ma come si sarà reso conto chiunque si sia trovato con una stilo caduta nel taschino dopo essersi svitata dal cappuccio, questo non è vero per la stoffa, che può assorbire notevoli quantità di inchiostro (anche da una penna rimasta aperta con la punta all'insù).

It is this balance of forces that keeps the flow of ink as long as you keep contact with the sheet, even if this generally does not cause stains because of the low porosity of writing paper that once wet does not absorb more ink on the surface, but as you will have realized anyone who has fallen with a stylus in the pocket after unscrewing from the cap, this is not true for the fabric, which can absorb significant amounts of ink (even from a pen remained open with the tip up).

[[Image:Waterman-52-BCHR-Feed.jpg|thumb|300px|Alimentatore e pennino di una [[Waterman 52]], con in evidenza l'inchiostro trattenuto dalla ''tensione superficiale'']]

[[Image:Waterman-52-BCHR-Feed.jpg|thumb|300px|Alimentatore e pennino di una [[Waterman 52]], con in evidenza l'inchiostro trattenuto dalla ''tensione superficiale'']]