![]() ![]() And what's that, you ask? We'll find out on the next page. These thermometers are nothing more than coiled bimetallic strips. The other, in the top layer of the thermostat, controls the heating and cooling systems. The one in the cover displays the temperature. ![]() There are two thermometers in this kind of thermostat. The third wire ends on the right side of the vial, so when the vial tilts to the right, the mercury makes contact between this wire and the bottom wire. One wire ends on the left side of the vial, so when the vial tilts to the left, the mercury contacts it - making contact between this wire and the one on the bottom of the vial. One wire goes all the way across the bottom of the vial, so the mercury is always in contact with it. Mercury is a liquid metal - it conducts electricity and flows like water. Let's start with the mercury switch - a glass vial with a small amount of actual mercury inside. Modern thermostats are almost exclusively digital, but before we get to those, let's take a trip down memory lane and look at the parts of a non-digital thermostat that you might still find in older homes and motels.
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