DetailsThe apparatus consists of a wood compound ring with four pointed strips of metal attached at 90 degrees to each other around the ring. The strips are attached so that their points are in the centre of the ring. At the other end of each strip there is an indentation for holding water. Each strip is made of a different metal -aluminium -brass -copper and iron. Depending on the conductivity of the metal the water will evaporate at different times.
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Catalogue Number EAHC0000 Size No Pack PC