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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 Missa brevis in D minor, K. 65/61a, is a mass composed by Wolfgang Amadeus Mozart (12 years old at the time) and completed on 14 January 1769. [1] It is scored for SATB soloists and choir, violin I and II, 3 trombones colla parte, and basso continuo.