English: Drawing of Faraday disk, the first electric generator, invented by British scientist Michael Faraday in 1831. The copper disk rotated between the poles of a horseshoe shaped magnet. The motion induced a radial flow of current in the disk. The current flows into the spring contact sliding along the edge of the disk, through an external circuit, and back into the disk through the axle. The labeled parts are given in the caption as: (A) inducing magnet, (D)induced disk, (B) binding-screw for current entering or exiting axis of disk, (B') binding-screw for current entering or exiting circumference of disk, (m) rubber (sliding spring contact) for edge of disk. The caption says 'Foucault's and Le Roux's apparatus' so this picture was not drawn from Faraday's original machine. Alterations: removed caption.