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.
(electrical engineering) a switch in which a circuit is completed between two terminals by liquid mercury when the switch is tilted

an electrical switch that opens and closes a circuit by shifting a vial of mercury to silently cover or uncover the contacts

The mercury switch is very useful for all sorts of applications, from water level sensing to mailbox open/closed.


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