  Mercury thermostat.
This is a mercury tilt switch thermostat of a type that was very common until quite recently. A bi-metallic strip coils and uncoils in response to changes in temperature, causing a glass ampule containing mercury to tip left or right, making or breaking a contact.
Source: Chris Anderson
Contributor: Chris Anderson
Acquired: 13 January, 2010
Text Updated: 13 January, 2010
Price: Donated
Size: 4"
Purity: 99%
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