For determining the relative conductivity of bad conductor material consists of cylindrical slab of brass 11.5cms. In dia and 12mm thick drilled to take thermometer. On this rests a 5cms deep steam chest of the same dia, with inlet and outlet tubes of steam. The apparatus is suspended by strings attached to the lower cylinder with thermometer. On retort stand with rectangular base 200 x 125mm, and rod 600mm long. Complete with one each disc specimens, glass and plastic 3mm and 1.5mm thick respectively, for determining the conductivity of liquids.