PSN-L Email List Message

Subject: Re: Cheap accelerometer
From: Doug Crice dcrice@............
Date: Wed, 15 Dec 1999 14:40:58 -0800


It's difficult to recommend that you even respond to this guy, because
it will only encourage him.  However, he ought to look at some of the
blast monitoring systems which combine geophones and acoustic sensors to
record effects from explosive blasts.

They aren't free of course, but it seems like obsolete ones show up on
eBay about once a month and sells for under $100.  Unfortunately, if you
go down that path, you'll probably end up testifying in court. It would
be better if you could keep quiet until he goes away.

A friend of mine does blasting and besides recording the data, always
makes a point of photographing existing cracks in nearby structures
before doing the blasting.  He was showing some of these photos to a
plaintiff recently, and she identified the cracks as the ones caused by
the blast effects.  He didn't make a point of telling her that the
photos were taken prior to the event, that comes later.

John Hernlund wrote:
> 
> Ted,
>    Part of being in our department at ASU is learning the skill of "wacko
> deflection" by referring crazies to somebody else.  Some jerk called up our
> department asking about measuring vibrations from his neighbor's stereo and
> he was deflected twice before ending up asking me (somebody told him I set up
> our seismometer display in the building).  I sent him a brief e-mail on it and
> thought it would be over, but the fellow keeps coming back for more.  He said
> he wants to get some kind of legal action taken by measuring the acceleration
> of his walls from his neighbor's "infrasound stereo" that the police can't
> hear, and hence won't do anything about.  This must be some stereo!  Now he
> sent me a nasty e-mail deriding me for not contacting him by telephone.  So if
> anybody can think of a way for me to get rid of him (beyond me deflecting him
> upon some other poor soul) by sending any info about cheap accelerometers
> please let me know...
> 
>    One day it would be fun to compile a list of all the wackos and what they
> were about.  We have had people make quite a few interesting scenes...like
> a fellow proving God's existence through mathematical jibberish and demending
> acceptance, people sure that the "face" on Mars was an alien artifact, the
> "flat earth" people who think that all earth and space scientists are hiding
> the truth and are obviously involved in strange cults (we told them that new
> students are inducted by candlelight in the basement where strange and exotic
> rites are performed), expanding earth theorists, etc....
> 
> John Hernlund
> E-mail: hernlund@.......
> WWW: http://www.public.asu.edu/~hernlund/
> 
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Larry Cochrane <cochrane@..............>