537772 Gilbert\'s experiment to demonstrate that two pieces of iron wire, A,B, placed near the pole, C, of a magnet, will have the same magnetism induced in them and so repel one another. From William Gilbert De Magnete, London, 1600 by Gilbert, William (1544-1603); (add.info.: "De Magnete, Magneticisque Corporibus"; English physicist experimenting in magnetism; Gilbert concluded that the earth was magnetic and this was why the compass pointed north; father of electricity; ); Universal History Archive/UIG; English, out of copyright.