PSN-L Email List Message
Subject: Re: SPRENGNETHER 201 LONG PERIOD VERTICAL SEISMOMETER
From: Dick Webb dwebb002@.............
Date: Wed, 20 Aug 2008 08:23:55 -0400
I have a few pieces of the original and will measure the width and
thickness as soon as I find a micrometer. I can attest that they are
rather fragile. I don't know the composition but they have a brassy
meredith lamb wrote:
> Am sure your round wire hinges (one per each hinge, or more?), that
> whomever had the vertical before you substituted the round wire they
> had, for the (probably
> broken) original flat springs therein. Evidently yours works ~ as
> is. Mine came with similar round piano wire/s; but they had like 4
> wires of ~ 0.025" diameter;
> per each of the two hinge clamps (eight total), which I replaced with
> flat springs....which also ~ worked...but, I still don't know the
> original flat spring width/thickness.
> Its interesting the variation of wire/flat springs that do work....but
> whether they are really even near ideal is literally unknown. If this
> spring pivot spring is too stiff/thick, the
> mass response won't be as enertially responsive as it ideally should be.
> Your second sentence below leaves me pondering whether its some ~ (not
> a normally spring) metal rod/s used? It should be 0.025" diameter
> piano wire....for initial setup flexuring
> that it will go through in the process, and for simple high strength
> when the spring is strung. I suppose you could use all the loose
> locking 1/4" rods to hold the boom;
> and use a fine file edge (single light stroke) to see if it very
> strongly resists filing like piano wire does, or; is relatively ~
> easily filed like iron etc. Another clue;
> piano wire is ultra smooth; a typical metal rod will feel like a drag
> on your fingers when lightly run over. "IF", the "straight length"
> you mention is bigger than 0.025",
> the previous owner may have removed acouple parts to accomodate their
> "reengineering"....and you have to live with such.
> Take care, Meredith
> On Tue, Aug 19, 2008 at 6:59 PM, JAMES ALLEN > wrote:
> Meredith and Dick
> My Spremgnether has two hinges made out of wire and looks like
> thick piano wire about 3/4 the thickness of pencil lead.
> Additionally, instead of wires being attached to each ends of the
> spring attachments each end of the spring has a straight length
> that goes into the adjustment nuts.
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