Thermal conductivity apparatus star shaped

Specifications

For demonstration of differences in the thermal conductivity of five different metals: brass, copper, aluminium, mild steel and stainless steel.
The 5 metal rods spread radially outwards and are equally spaced on each side of hexagonal brass hub.
Each rod has a small well at the end for holding paraffin wax.
The instrument is completed with an isolating handle.
When the central hub is heated, the paraffin wax contained in the cavities of different metals melts at different times depending on the thermal conductivity of the corresponding metal.