Translations:Funzionamento di una penna stilografica/3/en

From the first attempts to create a fountain pen, originating in the mid-1800s, the most critical point was to effectively ensure a uniform flow, which would allow the ink to escape from the tank in controlled quantities, which was sufficient to write on a sheet, but not to stain the pockets or the sheet itself. For this purpose the most complex mechanisms of valves, vents, taps etc. were invented, but the solution was not reached until the end of 1800, when it was understood that it was necessary to rely on the phenomenon of capillarity (one of the consequences of surface tension) in order to solve the problem.