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The [[pneumatic filler|pneumatic filling system]] used by [[Chilton]] is based on compression made by sliding the outside shaft of the pen over a internal metal cylinder which encloses the ink sac like a pump piston. The sliding barrel is equipped with a hole on the bottom that must be hold closed with a finger in the process of pushing it down for compression, but once opened it allow the expansion of the ink sac and the subsequent filling.
 
The [[pneumatic filler|pneumatic filling system]] used by [[Chilton]] is based on compression made by sliding the outside shaft of the pen over a internal metal cylinder which encloses the ink sac like a pump piston. The sliding barrel is equipped with a hole on the bottom that must be hold closed with a finger in the process of pushing it down for compression, but once opened it allow the expansion of the ink sac and the subsequent filling.
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Il sistema era semplice, funzionale e robusto, e consentiva di utilizzare sacchetti di gomma di dimensioni nettamente superiori rispetto a quelli dei concorrenti, tanto che le penne venivano promosse con lo slogan ''Twice the ink''. A causa però della maggiore lunghezza del gruppo pennino, resa necessaria dalla particolare struttura del sistema di caricamento, la forma delle penne era poco proporzionata per la corrispondente maggior lunghezza del cappuccio.
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The mechanism was simple, functional and robust, and allowed [[Chilton]] pens to use ink sacs with significantly larger dimensions than those of competitors, so that the pens were promoted with the slogan ''Twice the ink''. However the shape of pens was not proportionate because to block on the sliding barrel the cap had to be extended over the full length of the nib section, and that should be quite long because it was used to hold the pen when filling it. So the pens were having quite an excessive cap length.
    
[[File:Chilton-LongIsland-JadeGreen-Capped.jpg|thumb|left|Una [[Chilton]] in celluloide verde giada]]
 
[[File:Chilton-LongIsland-JadeGreen-Capped.jpg|thumb|left|Una [[Chilton]] in celluloide verde giada]]