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mercury switch

noun

, Electricity.
  1. 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.


mercury switch

noun

  1. 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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Mercury programmercury-vapor lamp