Thanks George for the offer. I would really appreciate receiving a =
picture of the pen assembly.  My email address is:  =
jcallen1@............
Thanks=20
James Allen
  ----- Original Message -----=20
  From: George Bush=20
  To: psn-l@.................
  Sent: Sunday, October 25, 2009 12:45 PM
  Subject: Re: Hypodermic Tubing


  James-

  I have a drum recorder that was originaly built by Howard Grebin and =
he built an ink pen like you are describing. He used capillary tubing, =
hypo needle and sheet brass shim stock all soft-soldered together. It =
has performed flawlessly for me for decades.

  I would be glad to send you a picture of the pen detail so you could =
see how he attached it to the galvanometer.

  George


  At 09:48 AM 10/25/2009, you wrote:

    =C3=AF=C2=BB=C2=BF=20
    Thanks Chris, Steve, Al, and Meredith for all your help.  I secured =
some very thin capillary tubing and a hypo. needle.  Will test approach =
and then try to cobble together attaching it to the existing stylus on =
the helicorder.  Will let the list know results.  It really is great =
knowing one is not alone on this quest.
    James Allen
    Cerritos, Ca.

      ----- Original Message -----=20

      From: ChrisAtUpw@..........

      To: psn-l@.................

      Sent: Sunday, October 25, 2009 8:40 AM

      Subject: Re: Hypodermic Tubing


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



        For some time some PSN members were using hypodermic needles to =
build ink pens. You simply grind the point off and have a precesion tip =
that  can then be connected to the reservoir using a capillary feed =
tube. We learned the process from Howard who used this design back in =
the first Bay area seismic station way before our time in the =
40=C3=A2=E2=82=AC=E2=84=A2s. I ran two drum recorders back around 1990 =
and Jan Froom currently has a display station at Bonfante Gardens  in =
Gilroy CA that has a permanent display he put together for them Regards, =
Steve Hammond PSN Aptos, CA


      Hi James,

         =20

          If you want to get ready supplies of fine SS hypodermic tubing =
see www.smallparts.com They have a very wide range. You can vary the =
flow rate by inserting a variable length of wire through the ink =
reservoir and into the capillary tube. It would probably be easier to =
get fine Nichrome wire than stainless steel.=20

          Alternatively, some companies used to make pens with a coarse =
tube to the reservoir and a fine 'nib' tube pushed into in the other =
end. There are only a limited range of hypodermic needles produced and =
some suppliers refuse to supply non medics, or only sell in boxed =
quantities.



          Regards,



          Chris Chapman



  George Bush
  Sea Ranch, CA, USA
=EF=BB=BF






Thanks George for the offer. =
I would really appreciate receiving a picture of the pen=20
assembly.  My email address is:  jcallen1@............
Thanks 
James Allen

  
----- Original Message ----- 
  From:=20
  George =
Bush 
  
To: psn-l@.............. 
  
Sent: Sunday, October 25, 2009 =
12:45=20
  PM
  
Subject: Re: Hypodermic =
Tubing
  

James-

I have a drum recorder that was originaly =
built=20
  by Howard Grebin and he built an ink pen like you are describing. He =
used=20
  capillary tubing, hypo needle and sheet brass shim stock all =
soft-soldered=20
  together. It has performed flawlessly for me for decades.

I =
would be=20
  glad to send you a picture of the pen detail so you could see how he =
attached=20
  it to the galvanometer.

George


At 09:48 AM =
10/25/2009, you=20
  wrote:

  
=C3=AF=C2=BB=C2=BF =

Thanks Chris, Steve, Al,=20
    and Meredith for all your help.  I secured some very thin =
capillary=20
    tubing and a hypo. needle.  Will test approach and then try to =
cobble=20
    together attaching it to the existing stylus on the =
helicorder.  Will=20
    let the list know results.  It really is great knowing one is =
not alone=20
    on this quest.
James Allen
Cerritos, Ca.

    

      
----- Original Message ----- 

      
From: ChrisAtUpw@.......=20
      

      
To: psn-l@..............=20
      

      
Sent: Sunday, October 25, 2009 8:40 AM

      
Subject: Re: Hypodermic Tubing


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

      


        
For some time some PSN members were using hypodermic needles =
to=20
        build ink pens. You simply grind the point off and have a =
precesion tip=20
        that  can then be connected to the reservoir using a =
capillary feed=20
        tube. We learned the process from Howard who used this design =
back in=20
        the first Bay area seismic station way before our time in the =
40=C3=A2=E2=82=AC=E2=84=A2s. I=20
        ran two drum recorders back around 1990 and Jan Froom currently =
has a=20
        display station at Bonfante Gardens  in Gilroy CA that has =
a=20
        permanent display he put together for them Regards, Steve =
Hammond PSN=20
        Aptos, CA


      
Hi James,

      
    

      
    If you want to get ready supplies of fine =
SS=20
      hypodermic tubing see www.smallparts.com They =
have a very=20
      wide range. You can vary the flow rate by inserting a variable =
length of=20
      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 =
pens=20
      with a coarse tube to the reservoir and a fine 'nib' tube pushed =
into in=20
      the other end. There are only a limited range of hypodermic =
needles=20
      produced and some suppliers refuse to supply non medics, or only =
sell in=20
      boxed quantities.

      

 
      
    Regards,

      

 
      
    Chris =
Chapman

  

  

George Bush
Sea Ranch, CA, USA
38.73775N, =
123.48882W=20