2. Fill a capillary tube with the compound to a height of approximately 3 - 4 mm. This can be accomplished by pressing the upper end of the capillary tube into the compound and then tapping the closed end on the table.
3. Attach the capillary tube to the thermometer using a small piece of rubber tubing or a rubber band. The bottom of the capillary tube should be even with the thermometer bulb.
4. Gradually heat the arm of the thiele tube. The rate of heating should be about 2 C per minute.