mercury switch

mercury switch

noun Electricity.
an especially quiet switch that opens and closes an electric circuit by shifting a vial containing a pool of mercury so as to cover or uncover the contacts.
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mercury switch
 
n
electrical engineering a switch in which a circuit is completed between two terminals by liquid mercury when the switch is tilted

Collins English Dictionary - Complete & Unabridged 10th Edition
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Main Entry:  mercury switch
Part of Speech:  n
Definition:  an electrical switch that opens and closes a circuit by shifting a vial of mercury to silently cover or uncover the contacts
Example:  The mercury switch is very useful for all sorts of applications, from water level sensing to mailbox open/closed.
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