Lee’S Disc Apparatus

Consisting of a cylindrical brass disc of 11.5cm diameter and 12mm thick suspended by three strings from a ring held in a stand. A thin circular disc to the test material is placed between this slab and 5cm deep hollow cylindrical brass vessel of the same diameter. The hollow vessel has two parts, one close to the bottom and the other close to the top of the vessel for inlet and outlet of steam respectively. The solid brass disc at the base and the
cylindrical drum at the top have holes drilled in them for inserting thermometers. The at surfaces of the metal disc and hollow cylinder are nickel plated and polished to ensure constant and uniform heat transfer. Supplied with three suitable test specimen (glass, cardboard, and Bakelite), withoutthermometers