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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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for mercury switch

mercury switch

(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 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Contemporary definitions for mercury switch

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.'s 21st Century Lexicon
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