PSN-L Email List Message

Subject: Re: Very Simple Sensor
From: james fisher kd6iwd@.........
Date: Mon, 19 Sep 2005 12:59:22 -0700 (PDT)

Hi Chris, The meter has small bearings that typically
are something like synthetic ruby with a needle point
pivot. I think that the very high intensity magnetic
field in a meter movement will make a good seismometer
if coupled to a mass to give it sensitivity. Also- I
did an experiment in which I hooked two identical
meter movements together, with the cover off of one, I
then moved the needle. The induced current in the
meter coil was sufficient to move the second meter
without any amplification at all. This suggests that
the efficiency is high.

Best Regards



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