A Faraday cup is a metal (conductive) cup designed to catch charged particles in vacuum. The resulting current can be measured and used to determine the number of ions or electrons hitting the cup. The Faraday cup is named after Michael Faraday who first theorized ions around 1830.
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“If you desire to drain to the dregs the fullest cup of scorn and hatred that a fellow human being can pour out for you, let a young mother hear you call dear baby “it.””
—Jerome K. Jerome (1859–1927)
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