Why must that be ?

Notebook paper is only 0.003" 

Why must a spring be so thin ?

Also,

This Zero Length spring stuff ?

Do I understand right when I think
a zero length spring does not change force as the spring length changes ?

Could this mean two springs in opposition somehow ?



-----Original Message----- 
From: Brett Nordgren 
Sent: Sunday, May 01, 2011 4:09 AM 
To: psnlist@.............. 
Subject: Re: Possible Spring To Use 

All,

Probably quite a bit too thick for a good spring.

I don't know about geophones in particular, but astatic verticals 
need springs made of material having thickness in the range of 0.005"-0.012".
New spring material is easy to find on line (from mcmaster.com, for 
one) and a good sized piece (~2 sq. ft.) costs about the same as new 
rake, though admittedly more than a discarded one.

Brett

At 10:50 PM 4/30/2011, you wrote:
>Jolly Good Show old man,
>can you please tell us if they would be
>suitable for such use in building a
>homemade geophone ?
>
>
>-----Original Message----- From: hsvham Sent: Sunday, May 01, 2011 
>2:35 AM To: psnlist@.............. Subject: Re: Possible Spring To Use
>
>I have a yard rake that has already started dismantling itself...I 
>can probably finish pulling it apart quite easily.
>
>Steve
>
>--- On Sat, 4/30/11, Geoffrey  wrote:
>
>From: Geoffrey 
>Subject: Possible Spring To Use
>To: "PSN_LIST" 
>Date: Saturday, April 30, 2011, 9:12 PM
>
>
>I was watching this Nobel Prize winner in Pasadena CA raking his 
>yard of leaves
>back in the 1970s and this makes me wonder today in 2011 if a common
>yard rake tine would be anyway suitable as use in a seismometer
>spring ?
>A large yard rake might have a dozen long steel flat springs
>if you can somehow dismantle the rake ?


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