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This page needs either filling out or deleting. Jiphex 20:54, 13 September 2005 (UTC)[reply]
A field emission gun consists of a sharply pointed tungsten tip held at several kilovolts negative potential relative to a nearby electrode, so that there is a very high potential gradient at the surface of the tungsten tip.
Looks like it's just been pulled straight from the first line of that page's section on Field Emission Gun. 83.100.234.17 16:37, 21 May 2007 (UTC)[reply]