PSN-L Email List Message
Subject: Re: Large earthquake near cost of Canada
From: John Lahr johnjan@........
Date: Sun, 06 Jan 2008 21:10:49 -0800
This image: http://jclahr.com/science/psn/as1/as1_dim.jpg
shows the construction of the AS-1. As long as the center of mass of
the boom is at the same vertical elevation as the boom knife edge
there will be no horizontal cross-axis sensitivity. The boom is
prevented from rocking back and forth by the width of the knife
edge. Also, rocking motion would not generate nearly as large a
voltage, as it would not have the optimum orientation of 90 degrees
for the cross product of the velocity vector with magnetic field vector.
A knife edge is NOT the best type of hinge. You can find a lot of
discussion of better hinge designs in the PSN E-mail archives.
At 07:45 PM 1/6/2008, Thomas Dick wrote:
..... does the AS-1 show any directional sensitivity....maybe as the
result of improper setup?
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