Precautions

1.) The diameter of the insulating disc should be equal to that of the cylindrical vessel and the metallic disc.

2.) The thermometer should be placed close to the face of the disc of the specimen.

3.) There should be a good thermal contact between the disc of material and the lower surface of the cylindrical surface and the upper surface of the circular metallic disc.

4.) The steady state temperature should be recorded only when the readings T1 and T2 remain constant after an interval of about 10 minutes.