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Place the glass tubing, sealed at one end, through the stopper. Fill the tube full of water colored with the dye. Quickly invert the tube, placing the lower end in a bottle about one-fourth full of the colored water. Press the stopper firmly in the bottle. Adjust the liquid in the tube by loosening the stopper or pressing it further into the bottle until the liquid is about half way along the exposed portion of the tube above the stopper. Then use the wax to seal the tube in the stopper and the stopper in the bottle. Tape the cardboard to the tube above the stopper.
Note the temperature on an accurate thermometer. Record this temperature on the cardboard, which will act as a temperature scale. Place the thermometers in a different temperature situation and leave them for a few minutes to allow the thermometers to register the new temperature. Note the new reading and mark on the scale. Carefully measure the distance between the two readings on the scale, and mark other degrees of temperature on it, as all other changes will be in the same proportion.
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Updated: March 12, 2004