For determining the relative conductivity of thin
layers of materials, it consists of cylindrical brass slab of 11 cm dia and
10.5 mm thickness. On this is connected another 4.5 cm deep brass hollow
cylinder (steam chest) of the same dia with inlet and outlet tubes for steam. A
hole for thermometer is drilled radically in each and the cylindrical brass
slab is fitted with eyelets to enable it to be suspended by three strings from
a stout annular ring. The ring is held on a heavy retort stand complete as
above with accessories but without thermometer.
