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2. Mercury switch - Wikipedia

   en.wikipedia.org/wiki/Mercury_switch

   A mercury switch is an electrical switch that opens and closes a circuit when a small amount of the liquid metal mercury connects metal electrodes to close the circuit. There are several different basic designs (tilt, displacement, radial, etc.) but they all share the common design strength of non-eroding switch contacts. The most common is the ...

3. Pressure switch - Wikipedia

   en.wikipedia.org/wiki/Pressure_switch

   One sensitive type of pressure switch uses mercury switches mounted on a Bourdon tube; the shifting weight of the mercury provides a useful over-center characteristic. The pressure switch may be adjustable, by moving the contacts or adjusting tension in a counterbalance spring.

4. Switch - Wikipedia

   en.wikipedia.org/wiki/Switch

   Switches can be designed to respond to any type of mechanical stimulus: for example, vibration (the trembler switch), tilt, air pressure, fluid level (a float switch), the turning of a key , linear or rotary movement (a limit switch or microswitch), or presence of a magnetic field (the reed switch). Many switches are operated automatically by ...

5. Anti-handling device - Wikipedia

   en.wikipedia.org/wiki/Anti-handling_device

   Tilt/vibration switches — this is a fuze installed inside the device which triggers detonation if the sensor is tilted beyond a certain angle or is subject to any vibration. Typically, some form of pendulum arrangement, spring-loaded "trembler" or mercury switch is used to detect this.

6. Mercury (element) - Wikipedia

   en.wikipedia.org/wiki/Mercury_(element)

   Mercury is used in thermometers, barometers, manometers, sphygmomanometers, float valves, mercury switches, mercury relays, fluorescent lamps and other devices, although concerns about the element's toxicity have led to the phasing out of such mercury-containing instruments. [11]

7. Mercury relay - Wikipedia

   en.wikipedia.org/wiki/Mercury_relay

   Normally closed mercury relay, with coil around top of tube and adjustable angle. A mercury relay (mercury displacement relay, mercury contactor) is a relay that uses mercury as the switching element. They are used as high-current switches or contactors, where contact erosion from constant cycling would be a problem for conventional relay contacts.