Lee & charlton's for determination of the thermal conductivity of bad conductor. Cylinderical metal slab nickel-plated 110mm. Diameter, 12mm thick, on this resets a steam chest made of brass nickel-plated 50mm height same diameter fitted with riffled inlet and outlet tubes. Both are having radial holes for insertion of thermometers. Apparatus is suspended by strings attached to lower slab on retort stand with rectangular metal base. Complete with one each disc specimens of glass and ebonite annulus for determining the conductivity of liquids. Without thermometers.