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Consists of 6 metal rods of different materials having equal lenghts mounted in corks with their lower ends in a four legged tank of 170mm high. Comprises six equal rods of copper, iron, lead, brass, zinc and aluminium each 130 x 3 mm dia. mounted in corks with their lower ends in a tank 210 x 75 x 75 mmThe tank is supported on four legs at a height of approx. 170mm above the bench. In use, the rods are lightly coated with paraffin wax and the rates of melting compared.