Procedure:

    (1)   Measure the mass of the brass disc using a balance and take it as m kg.
    (2)   Measure the diameter and hence the radius of the sample, S using vernier callipers. Calculate the circular
           area of the disc,
   (3)   Measure the thickness of the sample S using a screw gauge and take it as d
   (4)   Arrange the brass disc, sample disc and metallic disc as shown in the Figure 1. Insert the thermometers into
          the grooves of metallic disc and brass disc, which measure the temperatures T₁ and T₂ respectively.
   (5)   Place the heating chamber on the above assembly and suspend it as shown in Figure 1. Start the heater, by
          sending steam through the heating chamber.
   (6)   Monitor the temperatures T₁ and T₂ at a regular interval till they reach the steady state. Note the steady state            temperatures T₁ and T₂
   (7)  The next part is to determine the rate of cooling of brass disc. Lift the heating chamber and remove the           metallic  plate M and sample disc S, then place the heating chamber directly on the brass disc, B.
   (8)   Allow the brass disc B to heat atleast about 10 ⁰C above the steady state temperature T₂ measured in the first
          part of the experiment. Remove the heating chamber .