mercury-wetted reed switch

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mercury-wetted reed switch [′mər·kyə·rē ¦wed·əd ′rēd ‚swich]

(electricity)

A reed switch containing a pool of mercury at one end and normally operated vertically; the contacts on the reeds are covered with a mercury film by capillary action; each operation of the switch renews this mercury film contact, thereby increasing the operating life of the switch many times.

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