Hi Chris,

The 14 tho flat spring coil length is ~116 foot.  Unfortunately; I
checked further on
the web and its no longer being made in that thickness by Lyon Industries, but,
<12, 16> tho etc., are.

The 7 tho flat spring 2 coils total length is ~320 foot.  Still in
production.  Correction
on width; its 1/2".

All old/new stock surplus.  CDA-510 grade A; apparently very widely
used, high strength and resilence.  Possibly very slightly magnetic
but haven't checked.

Could be interesting....

Take care, Meredith



On 3/24/08, ChrisAtUpw@.......  wrote:
> In a message dated 23/03/2008, paleoartifact@......... writes:
>
> I ran across some phosphor bronze metal alloy strip coils recently and
> naturally the thought of
> using such in a seismometer comes to mind.  One size is .007" thick  X .375"
> width,
> and the other is .014" thick X 1" width.  The springs are  tempered.
>
> Hi Meredith,
>
>     The 7 thou stuff is likely too rigid for a good  Wood-Anderson. You can
> buy bronze wire relatively easily.
>
>     And it is rather thick for light flexures. Maybe OK  on a Sprengnether.
>
> The internet yields very little or no recommendations or any real strong
> negative
> (metal creep..PSN email @ ~1999).
>
> Besides the possible usual flexure use: I do envision (muse) on the  thought
> of
> trying such as a taut vertical strip spring and with a  attached/extended
> light weight mass
> which operates in a horizontal sensing configuration.  Yes; its a  old idea
> similar to the old
> Wood-Andersons of yesteryear; but different only in it being a strip and
> not
> a round
> wire as a torsion pivot.
>
> Thoughts?  Recommendations?
>
>
>     The 14 tho stuff should make OK springs for a  vertical?
>     How long are the coils?
>
>     Regards,
>
>     Chris
>
>
>
>
>
__________________________________________________________

Public Seismic Network Mailing List (PSN-L)