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The second photo on this web-page
http://www.interactives.co.uk/hands_earth-science.htm shows a seismograph
'mini-interactive' I have designed. It is a very simple low-level
demonstration of the basic concept, in which a classical 'swinging-gate'
inertia mechanism moves a bright LED lamp above a slowly rotating disc of
photophosphorescent plastic when anyone shakes the table on which it stands.
This draws a wiggly glowing trail on the disc which slowly fades away before
each rotation is completed.


Promoting public engagement with science
through a contagious delight in phenomena
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[log in to unmask] * http://www.interactives.co.uk
*
Give people facts and you feed their minds for an hour.
Awaken curiosity and they feed their own minds for a lifetime.
*
Ian Russell 

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