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For demonstrating the different heat conductivity of five metals by observing the melting of wax. Consists of five rods (I x d), 75x 5mm of aluminium, brass, iron, copper, and stainless steel which are radially fitted on a brass disk of about 27mm diameter. Each of these rods have a cavity at the outer end for holding paraffin wax. The central disk is joined to an insulated handle by 125mm long plated steel rod. Overall length about 32cm.