PSN-L Email List Message
Subject: RE: Latest Lehman Seismometers
From: "Gary Lindgren" gel@.................
Date: Fri, 23 Apr 2010 16:48:15 -0700
Tim,
I'm not sure what you mean by 'prototype'. The only picture I had of the
whole seismometer was Figure 1. The first unit I built 2 years ago is really
the same thing and only difference was to use 2.5" bar stock and clean
things up.
Gary
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Timothy Carpenter
Sent: Friday, April 23, 2010 4:00 PM
To: psn-l@..............
Subject: RE: Latest Lehman Seismometers
Gary,
Very classy. I note that your prototype had its vertical bar set parallel to
the boom while the new unit has the bar perpendicular to the boom. I didn't
note anything in your commentary for the change (or did I miss it?). I
suspect that there'd be no measurable difference either way, but my first
reaction was that the bar should be orientated as in the prototype - because
of potential warping due to differential thermal distributions. But that
shouldn't really be a problem at this scale.
Regards,
-Tim-
Timothy Carpenter
5043 Whitlow Ct.
Commerce Twp., Michigan 48382
248-363-4529
248-766-1629
geodynamics@...........
geodynamics@.......
From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Gary Lindgren
Sent: Friday, April 23, 2010 5:31 PM
To: psn-l@..............
Subject: Latest Lehman Seismometers
Hello All,
I have documented the latest update to my Lehman seismometer(s). See
http://sites.google.com/site/seismicsensorinfo/lehman-seismometer
There are several pictures and also a finite-element analysis of the Chapman
magnet design.
Gary
Gary Lindgren
585 Lincoln Ave
Palo Alto CA 94301
650-326-0655
www.blue-eagle-technologies.com
Check out Lastest Seismometer Reading
cymonsplace.blogspot.com
sites.google.com/site/seismicsensorinfo/Home
Design Details
for New Vertical Seismometer
Tim,
I'm not sure what you =
mean by
'prototype'. The only picture I had of the whole seismometer was Figure =
1. The
first unit I built 2 years ago is really the same thing and only =
difference was
to use 2.5" bar stock and clean things up.
Gary
From:=
psn-l-request@.............. [mailto:psn-l-request@............... On =
Behalf
Of Timothy Carpenter
Sent: Friday, April 23, 2010 4:00 PM
To: psn-l@..............
Subject: RE: Latest Lehman Seismometers
Gary,
Very classy. I note =
that your
prototype had its vertical bar set parallel to the boom while the new =
unit has
the bar perpendicular to the boom. I didn’t note anything in your =
commentary
for the change (or did I miss it?). I suspect that there’d be no =
measurable
difference either way, but my first reaction was that the bar should be
orientated as in the prototype – because of potential warping due =
to
differential thermal distributions. But that shouldn’t really be a =
problem at
this scale.
Regards,
-Tim-
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