David 
Nishimura Vintage Fountain Pens & Writing Equipment Filling Instructions: Blow-Fillers

 

The blow-filler is the simplest pneumatic-filling pen design possible.  One blows through a hole at the end of the barrel, thus emptying out the ink sac.  When the pressure is released, the sac expands and fills.

Blow-fillers were sometimes offered with an accessory rubber bulb, as shown in the picture above, which permitted the pen to be filled in a more dignified and hygenic manner.


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