Thomas Alva Edison - The photophone
  Year :   1881
  Location :   USA
  Worktype :   -
  Materials:   -
  Info :   -

  Work Details  
  a device that enabled sound to be transmitted on a beam of light. Bell and his assistant, Charles Sumner Tainter, developed the photophone using a sensitive selenium crystal and a mirror that would vibrate in response to a sound. In 1881, they successfully sent a photophone message over 200 yards from one building to another. Bell regarded the photophone as the greatest invention I have ever made; greater than the telephone. Bells invention reveals the principle upon which todays laser and fiber optic communication systems are founded, though it would take the development of several modern technologies to realize it fully. Accessed 30.01.2008 from