PSN-L Email List Message

Subject: Inertia Wheel Sensor
From: Chuck/Judy Burch cjburch@...........
Date: Sat, 13 Jun 2009 08:51:22 -0600


A wheel with most of its mass at the rim has a large moment of inertia 
(the rotational analog of mass).  If it's mounted with the axis 
horizontal using a very low friction bearing, then it will tend to stay 
at rest if the local earth's surface tilts.  Morrissey constructed a 
balance beam tiltmeter that operated on the same principle.  It's 
described on his website.

Chuck Burch

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