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Contact thermostat.
An example of the element Mercury

Sample Image
Mercury Contact thermostat
Contact thermostat.
This is a really neat, though broken, precision thermostat. It has a fine lead screw that allows you to adjust a very fine wire up and down. The wire is sticking down into the capillary tube of what is otherwise an ordinary mercury thermometer. When the mercury rises to the level of the wire it makes electrical contact with it, switching off the power to whatever heater the unit is controlling. This is is no doubt a much more accurate thermostat than the typical bi-metallic strip kind, and it is intended for scientific applications.
Source: Ursula Carlson
Contributor: Ursula Carlson
Acquired: 20 November, 2003
Price: Donated
Size: 12"
Purity: 99.9%
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