Principle

The thermal conductivity of various materials is analysed by
comparing copper, aluminium, brass and glass with each other. In
each case, one side of a rod bent into a U-shape is immersed in hot
water. Heat is transfered via the rods which is demonstrated with
heat sensitive paper. In the second part of the experiment, the
warming up of a vessel on the other side of the rod shows that heat
is transferred through the rod.