PSN-L Email List Message
Subject: Re: Mystery scavenger seismometer part and pivot systems
From: Charles Patton charles.r.patton@........
Date: Tue, 09 Sep 2008 21:36:32 -0700
It might make a good crossed wire roll pivot - if it has about three
brothers. Crossed wire/band pivots are similar to a Rollamite except
with space between the rolls so they're not running in contact. In
previous Brett Nordgren tests these types of pivots had the lowest
Brett, Chris Chapman and I are putting the finishing touches on a web
site page with exact formulas in spreadsheet form for several pivots so
amateurs can experiment with more insight into what is happening with a
given geometry, i.e., finding the locus for the pivot along with some
practical comments about their use.
+ Crossed wire/band rolls (such as separated Rollamite cylinders)
+ Crossed wire/band suspensions (such as used in LIGO vibration
+ ball on plate (the typical pivot of choice for many Lehmans) (a bit of
advance warning -- this is one of the worst)
+ plate on ball (much better than ball on plate, and same complexity of
meredith lamb wrote:
> Just for fun, I put this up on a web page. What it is in normal use is
> apparent, but the real scavenger
> in you question is; what do you think it could be used for in a
> seismometer? Yes; its a bit "outside the box"
> of what a great majority of home seismometer builders have done/tried/or
> actually use. I doubt the mystery
> description/use will take very long for someone to give the right answer.
> Take care, Meredith
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