Crown of Cups
   In 1800 Alessandro Volta (1745-1827) described the Crown of Cups in a letter to Sir Joseph Banks, the President of the Royal Society. It consisted of a series of glasses, often arranged in a circle, containing acidulated or salt water, and connected by metal straps dipping into the liquid. These straps consisted of a ribbon of one metal (say copper) soldered to the end of a ribbon of another metal (say zinc). This was an alternative to the  voltaic pile. The same arrangement is used in the water battery.

   The name of the apparatus arises from its circular shape.

   This example is in the Garland Collection of Classical Physics Apparatus at Vanderbilt University.

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