zitiert bei Kurt Tucholsky (Peter Panter): Ein Indianerbuch der Technik (Rezension von ‚Edison, Sein Leben und Erfinden, Erzählt von Ernst Angel‘). Die Weltbühne 23. November 1926 Jahrgang 22, Nummer 47, Seite 830-831
(Original engl.: "Genius is one per cent inspiration, ninety-nine per cent perspiration." - zitiert als mündliche Bemerkung aus dem Jahr 1903 von Martin André Rosanoff: Edison in his laboratory. In: Harper’s Monthly Magazine. September 1932, S. 406, (online) http://www.harpers.org/archive/1932/09/0018333
"Genius is 1 per cent. inspiration and 99 per cent. perspiration." - zitiert als Edisons "historic remark" von Frank Lewis Dyer and Thomas Commerford Martin: Edison, His Life and Inventions. New York and London, 1910. gutenberg.org http://www.gutenberg.org/files/820/820.txt und
"Thomas A. Edison is credited with saying that real genius is made up of three parts inspiration and ninety-seven parts perspiration." - Popular Mechanics,Vol. VII No. 8, August 1905, p. 860.
Once, when asked to give his definition of genius, Mr. Edison replied: "Two per cent, is genius and ninety-eight per cent, is hard work." At another time, when the argument that genius was inspiration was brought before him, he said: “Bah! Genius is not inspired. Inspiration is perspiration.” - The Anecdotal Side of Edison. His Estimate of Genius. Ladies' Home Journal, April 1898 p. 8 books.google http://books.google.de/books?id=LKwiAQAAMAAJ&q=definition
