Modifiche

<noinclude>{{ReferBox|Filling systems}}</noinclude>In [[1924]] ''Seth Chilton Crocker'' resumed the idea of the ''blow filler'' invented by his father ''Seth Sears Crocker'', further refining it using a new patent ({{Cite patent|US|1528379}}, by David J. La France). The new system was based on the fact that the body of the pen slides around a metal tube screwed on the nib assembly to which was mounted the classic rubber sac to compress. To perform this action, the outer barrel of the pen could slide on the inner barrel and the watertight seal between the two was made by a waxed wire placed at the end of the inner metal cylinder.  

<noinclude>{{ReferBox|Filling systems}}</noinclude>In 1924 ''Seth Chilton Crocker'' resumed the idea of the ''blow filler'' invented by his father ''Seth Sears Crocker'', further refining it using a new patent ({{Cite patent|US|1528379}}, by David J. La France). The new system was based on the fact that the body of the pen slides around a metal tube screwed on the nib assembly to which was mounted the classic rubber sac to compress. To perform this action, the outer barrel of the pen could slide on the inner barrel and the watertight seal between the two was made by a waxed wire placed at the end of the inner metal cylinder.

The outer barrel of the pen had, as for the ''[[blow filler]]'' an aeration hole on the bottom. The filling was obtained by sliding back the body of the pen and then bringing it back into position by keeping the hole in the bottom closed with a finger. In this way the pressure generated on the sac causes its compression, but once left free the aeration hole the subsequent expansion of the sac causes the suction of the ink.

The outer barrel of the pen had, as for the ''[[blow filler]]'' an aeration hole on the bottom. The filling was obtained by sliding back the body of the pen and then bringing it back into position by keeping the hole in the bottom closed with a finger. In this way the pressure generated on the sac causes its compression, but once left free the aeration hole the subsequent expansion of the sac causes the suction of the ink.