INVENTOR TALKS ABOUT HIS MOST FAMOUS INVENTION AND ONE OF ITS MOST IMPORTANT APPLICATIONS
LEE DE FOREST HANDWRITTEN LETTER SIGNED, “Faithfully/Lee de Forest”, on a card 4.5 x 3, 1/12/1916, by the American inventor, self-described “Father of Radio”, and developer of sound-on-film recording used for motion pictures. He handwrites a letter in which he talks about his most famous invention, the tree-element “Audion” (Triode) vacuum tube, the first practical amplification device which made possible radio broadcasting, long-distance telephone lines, and talking motion pictures, among countless other applications. In full: “Dear Mr. Cole/I am pleased to count you among the friends of the ‘Audion’. In long-distance communications it renders you service.” This excellent content handwritten letter is in fine condition, with minor age toning.