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pointer with
There is a variation on this demo (linear expansion) that replaces the
a small mirror attached to a needle which the rod rests upon. Youreflect a laser
off the mirror onto the wall. When you heat the rod, the expansionrotates
the needle/mirror assembly and the laser spot on the wall will movegreater "wow" factor.
dramatically. I've done it both ways, but the laser seems to have the
Glenn Knapp