Procedure

Fill the boiler with water to nearly half and heat it to produce steam.

Put the specimen, steam chamber etc. in position and suspend it from the clamp stand. Insert the thermometers T1 and T2 in position.

Pass steam from the inlet of the cylindrical vessel and wait till the steady state is reached. This will take 30-40 minutes to reach the steady state.

Temperatures recorded in the thermometers will show a rise and finally will be steady at T1 and T2. Then, wait for 10 minutes after reaching the steady state to confirm that actual steady state is reached or not. Note the steady temperatures indicated by the thermometers T1 and T2. Interchange the thermometers T1 and T2 and again note down the temperature readings.

Remove the steam chamber and the specimen G. C is still suspended. Heat C directly by the steam chamber till its temperature is about T1 + 10°.

Remove the steam chamber and wait for 30-60 seconds so that heat is uniformly distributed over the disc C.

Place the insulating material on C. Start recording the temperature at intervals of 30 seconds. Continue till the temperature falls by 10°C below T1.

Plot a graph between temperature and time.

Take weight of C by a weighing balance. Measure the diameter of the specimen by using vernier calipers. Calculate the surface area, 𝐴 = 𝜋𝑟 2 .

Measure the thickness of the specimen by screw gauge. Take observations at 3 or 4 spots and take the mean value.