Sketches from Faraday's diary show the progression of his electromagnetic experiments. 1) He repeats Oersted's discovery of 1820 that a magnetic needle plead near a conductor is displaced with a motion circular and perpendicular to it. 2) He bends a wire conductor into a curve, floating one end on a cork in mercury, then puts a bar magnet in the curve, causing the wire to swivel around it in the first demonstration of electromagnetic rotation. 3) In a modification of 2, he fixes the magnet upright in a bowl of mercury to allow the floating conductor to revolve completely around it - the principle of the electric motor. 4) In 1831, winding two coils of wire A and B on an iron ring and connecting A with a battery, he causes an intermittent current to low in B, thus discovering electrical induction. 5) Plunging a magnet in and out of a hollow cylinder and coil connected to a galvanometer, he shows that induction is caused by the relative motion - the principle of the electric generator. 6) Rotating a copper disc between the opposite poles of the Royal Society's compound magnet, he induces a continuous current - the birth of the dynamo.