PSN-L Email List Message

Subject: Re: A spring's constant
From: "Geoffrey" gmvoeth@...........
Date: Sat, 22 Aug 2009 15:23:05 -0700

Hello Group;

Does this mean that although
I set the Hs10-1 vertical to its center point
prior to burying it in the ground
a couple years ago I should
occasionally dig it up and
reset the center point
since it has a spring inside ??

Also, would it hurt to open it up
and increase its mechanicanical damping
and water resistance by filling its cavity with
low viscosity machine oil ( like 3 in one oil) ?
Like, does oil eat the insulation off the
wires even tho it protects metal against water
a bit better than nothing ?

Is there a "water getter" you might put into
an oil bath to chemically react and neutralize
any water present at the bottom of the oil ?

Ill just set back and listen to any responses.

I have heard you can dismantle a handgun
and put it in an oil bath in a jar or something
then 20 years later dig it up reassemble it
and its as good as new ?
Might work for geophones too ?

Best Regards;
----- Original Message ----- 
Sent: Saturday, August 22, 2009 12:31 PM
Subject: Re: A spring's constant

 The subject of springs constantly pops up. It might be of interest to  
look at the spring from the base of an old angle poise lamp. This is in fact a  
negative length spring for small loads; the intersect passes though zero to 
 become a positive length as the load increases. It is possible to adjust a 
 seismometer fitted with such a spring to give a period of 15  seconds but 
it will not remain in this state for long.  As in all  springs the elastic 
stain is slowly replaced by creep strain. In  general the mechanism of creep 
is divided into dislocation and diffusion  creep both of which are 
temperature dependent . Dislocation creep is usually at  a max for a new spring and 
hence the use of an old angle poise lamp spring. 
Regards Martin


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