"Patronize me and I'll turn it off anyway," Lorna said dryly. He was really, really getting on her nerves, "Yes, I know what it is. Definition: A Faraday cage or Faraday shield is an enclosure formed by conducting material or by a mesh of such material. Such an enclosure blocks out external static electric fields. Faraday cages are named after the English scientist Michael Faraday, who invented them in 1836," Lorna said, her tone unamused at best.