Olivetti JP101 ink cartridges?

[Tony Duell]

> 
> Tony Duell wrote:
> > Does anyone have any suggestions as to how to make ink cartridges for 
> > this machine?
> 
> Given that description, and the fact that you have three cartridges,
> surely the best way is to re-fill the one(s) that you've got?  In

I would agree, if I can get them apart non-destructively. The metal cap 
on the back end is crimped on (like an old milk bottle cap, but thicker 
metal). I may have to cut theat off and make a repalcement. I do not want 
to break the glass tube, although it may not be too hard to make a 
replacement for that either. 

> which case, the question is really "what's special about that ink?"
> It must be conductive, for one.  Lots of carbon black in it?

A friend driected me to US patent 4332487. This is clearly not the same 
printer, but the principles are the same The ink is indeed conductive, 
and is indeed mostly carbon (95%). Various binders are suggested, no 
details of shick one is used are given. 

I wonder what pencil 'lead' would do here...

-tony