Saturday Evening Post weekly magazine is launched in the US.
It continues until 1969.
Principles of electromagnetic rotation discovered by Michael Faraday (1791-1867).
Augustin Fresnel (1788-1827), in his research into the theory of polarised light, discovers that light waves vibrate transversely, at right angles to the direction of propagation, and not longitudinally (like sound).
Charles Wheatstone (1802-1875) [right] demonstrates sound reproduction.
First Diorama, combining partially translucent paintings with lighting effects, opened in Paris by Louis-Jacques Mandé Daguerre (1759-1851) and Claude-Marie Bouton.
J N Ničpce’s first photograph, requiring nine hours’ exposure, is made using a glass plate coated with bitumen of Judea, which hardens when exposed to light.