There is a typo. Not needs try needle. Steve

 

From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Stephen Hammond
Sent: Saturday, October 24, 2009 8:38 PM
To: psn-l@..............
Subject: RE: TELEDYNE-GEOTECH HELICORDER

 

For some time some PSN members were using hypodermic needs to build ink
pens. You simply grind the point off and have a precession 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's. 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
also using this design. 

Regards, Steve Hammond PSN Aptos, CA

 

 

From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of James Allen
Sent: Saturday, October 24, 2009 8:09 PM
To: psn-l@..............
Subject: Re: TELEDYNE-GEOTECH HELICORDER

 

I think that Chris has a great idea for using ink on a Helicorder.   I
appreciate it and will experiment with this approach.

James Allen

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

From: ChrisAtUpw@....... 

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

Sent: Saturday, October 24, 2009 6:54 PM

Subject: Re: TELEDYNE-GEOTECH HELICORDER

 

In a message dated 24/10/2009 22:44:00 GMT Daylight Time,
paleoartifact@......... writes:

Perhaps Geotech might have such as Al Hrubetz suggests...but being as ink
stylus writing went out long ago...one may have to resort to other
(surplus...read: junk or unknown condition substitutes) brands.

Hi James,

 

    It's just an idea, but I can still buy ink drawing pens for technical
drawing. They have plastic push on ink cartridges which can be refilled and
the ink is available in 250 ml and 23 ml bottles. The ones which I am
familiar with are UNO and Rotring. The Rotring Isograph nibs are available
separately from 0.1 to 1.0 mm. 

    Note that you can also buy fine stainless steel tube in a wide range of
sizes. I use fine piano wire for cleaning blocked pens with the special
cleaning solution. Hot Fairy washing up liquid also breaks down the ink
quite well.

    Note that hot wires are usually spot welded on. I would expect the wire
to be Nichrome.

 

    Regards,

 

    Chris Chapman

    .  














There is a typo. Not needs try needle… =
Steve

 





From:=

psn-l-request@.............. [mailto:psn-l-request@............... On =
Behalf
Of Stephen Hammond

Sent: Saturday, October 24, 2009 8:38 PM

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

Subject: RE: TELEDYNE-GEOTECH HELICORDER





 

For some time some PSN members were using hypodermic =
needs to
build ink pens. You simply grind the point off and have a precession 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’s. 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 =
also
using this design. 

Regards, Steve Hammond PSN Aptos, =
CA

 

 





From:=

psn-l-request@.............. [mailto:psn-l-request@............... On =
Behalf
Of James Allen

Sent: Saturday, October 24, 2009 8:09 PM

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

Subject: Re: TELEDYNE-GEOTECH HELICORDER





 



I think that Chris has a great idea for using ink on a
Helicorder.   I appreciate it and will experiment with this =
approach.





James Allen







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





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






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






Sent: Saturday, October 24, 2009 6:54 PM





Subject: Re: TELEDYNE-GEOTECH HELICORDER





 







In a message dated 24/10/2009 22:44:00 GMT Daylight Time, =
paleoartifact@......... =
writes:







Perhaps Geotech might have such as Al Hrubetz =
suggests...but being
as ink stylus writing went out long ago...one may have to resort to =
other (surplus...read:
junk or unknown condition substitutes) brands.









Hi James,





 





    It's just an idea, but I can still =
buy ink
drawing pens for technical drawing. They have plastic push on ink =
cartridges
which can be refilled and the ink is available in 250 ml and 23 ml =
bottles. The
ones which I am familiar with are UNO and Rotring. The Rotring Isograph =
nibs
are available separately from 0.1 to 1.0 mm. 





    Note that you can also buy fine =
stainless
steel tube in a wide range of sizes. I use fine piano wire for cleaning =
blocked
pens with the special cleaning solution. Hot Fairy washing up liquid =
also
breaks down the ink quite well.





    Note that hot wires are usually =
spot
welded on. I would expect the wire to be Nichrome.





 





    Regards,





 





    Chris Chapman





    .