=20
In a message dated 25/10/2009, jcallen1@........... writes:

For  some time some PSN members were using hypodermic needles to build ink=
=20
pens.  You simply grind the point off and have a precesion tip that  can=
=20
then be  connected to the reservoir using a capillary feed tube. We learne=
d the=20
process  from Howard who used this design back in the first Bay area=20
seismic station  way before our time in the 40=E2=80=99s. I ran two drum=
 recorders back=20
around 1990 and  Jan Froom currently has a display station at Bonfante Gar=
dens=20
 in Gilroy  CA that has a permanent display he put together for them=20
Regards,  Steve Hammond PSN Aptos, CA


Hi James,
   =20
    If you want to get ready supplies of fine SS  hypodermic tubing see=20
_www.smallparts.com_ (http://www.smallparts.com)   They have a very wide=
 range.=20
You can vary the flow rate by inserting a variable  length of wire through=
=20
the ink reservoir and into the capillary tube. It would  probably be easie=
r=20
to get fine Nichrome wire than stainless steel.=20
    Alternatively, some companies used to make pens  with a coarse tube to=
=20
the reservoir and a fine 'nib' tube pushed into in the  other end. There=
 are=20
only a limited range of hypodermic needles produced and  some suppliers=20
refuse to supply non medics, or only sell in boxed  quantities.
=20
    Regards,
=20
    Chris Chapman






In a message dated 25/10/2009, jcallen1@........... writes:

  
For=20
  some time some PSN members were using hypodermic needles to build ink pe=
ns.=20
  You simply grind the point off and have a precesion tip that  can=
 then be=20
  connected to the reservoir using a capillary feed tube. We learned the=
 process=20
  from Howard who used this design back in the first Bay area seismic stat=
ion=20
  way before our time in the 40=E2=80=99s. I ran two drum recorders back=
 around 1990 and=20
  Jan Froom currently has a display station at Bonfante Gardens  in=
 Gilroy=20
  CA that has a permanent display he put together for them Regards,=20
  Steve Hammond PSN Aptos, CA

Hi James,
    
    If you want to get ready supplies of fine SS=
=20
hypodermic tubing see www.smallparts=
..com=20
They have a very wide range. You can vary the flow rate by inserting a var=
iable=20
length of wire through the ink reservoir and into the capillary tube. It=
 would=20
probably be easier to get fine Nichrome wire than stainless steel. 
    Alternatively, some companies used to make pe=
ns=20
with a coarse tube to the reservoir and a fine 'nib' tube pushed into in=
 the=20
other end. There are only a limited range of hypodermic needles produced=
 and=20
some suppliers refuse to supply non medics, or only sell in boxed=20
quantities.
 
    Regards,
 
    Chris Chapman