Calibrated thermistor: This is a semiconductor that conducts electricity
much better as it warms up. As a result, you find that its resistance changes
very quickly with temperature.
Clip leads (4)
Heat shrink insulation ("Spaghetti")
30 cm stiff iron wire
Thermometer: An oven (or freezer) thermometer with a bimetallic spiral.
As the metal spiral heats up, it expands and rotates a dial on the front of the thermometer.
This kind of a thermometer can be used to make a thermostat.