Thermostat switch. | |||
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| Thermostat switch. This is a small self-contained thermal switch: It make an electrical contact when the temperature rises above 60C. It works by having two small wires embedded in what amounts to a simple mercury thermometer. When the column of mercury reaches the second wire, the connection is made. Why build a switch this way rather than use a bi-metallic strip such as is used in common household thermostats, or an electronic sensor? Well, it's much more accurate than the bi-metallic strip, and it was probably made before electronic sensors were practical. (And even now, it's much simpler and probably more reliable than an electronic system. I don't know if switches like this are still made or commonly used today.) Source: eBay seller tubesrus Contributor: Theodore Gray Acquired: 16 July, 2006 Text Updated: 5 December, 2006 Price: Donated Size: 2" Purity: 99.9% | |||
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