Experiment Gallery

John Logie Bairds experiment, showing how television transm

Sending pictures through the air. Baird's system of television transmits its wireless pictures. John Logie Baird transmitted a moving image by wireless, showing gradations of light and shade, with some colour, red and blue. The picture was sent from a 9 mile distance from London to Harrow

© Illustrated London News Ltd/Mary Evans

07, 1926, 21, Air, Baird, Blue, Colour, Dec, Distance, Experiment, Gradations, Harrow, Historical, History, Iln, Image, Import, John, Light, Logie, Mile, Moving, Picture, Pictures, Red, Sending, Shade, Showing, System, Television, Transm, Transmits, Transmitted, Wireless

Diagrams of magnets, magnetic fields, iron filings, etc

Diagrams of magnets, magnetic fields, iron filings, etc. Copperplate engraving by Wilson Lowry from Abraham Rees Cyclopedia or Universal Dictionary of Arts, Sciences and Literature, Longman, Hurst, Rees, Orme and Brown, London, 1812. Date:

© Florilegius/Mary Evans

18th, Abraham, Arts, Century, Copperplate, Cyclopedia, Diagram, Dictionary, Drawing, Engraving, Experiment, Field, Filings, Illustration, Iron, Literature, Magnet, Magnetic, Magnetism, Rees, Scale, Science, Sciences, Universal

Louis Daguerre discovers use of silver iodide in photography

Pioneer of photography, Louis Daguerre (1787 1851) developed the process of the daguerreotype. One of the most significant problems which occurred during the invention of photography was getting the image to remain, to resolve this issue Daguerre concentrated on the properties of silver salts. He discovered a photographic process which involved exposing a thin silver-plated copper sheet to the vapour from iodine crystals which produced a coating of silver iodide on the surface. This plate could then be exposed with the camera to create a photograph. The engraving presents an image of Daguerre experimenting within his workshop with the silver iodide which became a crucial step in the photographic process. Date: 1830s

© Mary Evans Picture Library