high frequency. p. 58. http://books.google.com/books?id=kNhCQPbYIsgC&printsec=frontcover#v=onepage&q&f=false. Retrieved 26 November 2010. ^ Barrett, John Patrick (1894). Electricity at the Columbian Exposition; Including an Account of the Exhibits in the Electricity Building, the Power Plant in Machinery Hall. pp. 268 269. http://books.google.com/?id=CLtIAAAAMAAJ&printsec=frontcover#v=onepage&q&f=false. Retrieved 29 November 2010. ^ Nikola Tesla, Startling Prediction of the World's Greatest Living Scientist (Article, the North American, 18 May 1902).^ Pages 284-285, William R. Lyne, Pentagon Aliens, 1993.^ A Survey of Laser Lightning Rod Techniques. Barnes, Arnold A., Jr.; Berthel, Robert O.^ Waser, Andre, "Nikola Teslas Radiations and the Cosmic Rays".^ Tesla, Nikola, "My Inventions", Electrical Experimenter magazine, Feb, June, and Oct, 1919. ISBN (also "The Strange Life of Nikola Tesla" at rastko.org)^ Jonnes 2004, p. 355^ According to the Tesla memorial marker in Memorial park on Pikes Peak Ave.^ Tesla, Nikola, "The True Wireless". Electrical Experimenter, May 1919. (also at pbs.org)^ Gillispie, Charles Coulston, "Dictionary of Scientific Biography"; Tesla, Nikola. Charles Scribner's Sons, New York. ISBN^ Corum, K. L., J. F. Corum, and A. H. Aidinejad, "Atmospheric Fields, Tesla's Receivers and Regenerative Detectors". 1994.^ Corum, K. L., J. F. Corum, "Nikola Tesla, Lightning Observations, and Stationary Waves". 1994.^ Tesla, Nikola, "Talking with Planets". Collier's Weekly, 19 February 1901. (EarlyRadioHistory.us)^ Spencer, John (1991). The UFO Encyclopedia. New York: Avon Books. ISBN 978-0-38-076887-5. ^ Corum, Kenneth L.; James F. Corum (1996). Nikola Tesla and the electrical signals of planetary origin. p. 14. OCLC 68193760. ^ Broad, William J. (4 May 2009). "A Battle to Preserve a Visionarys Bold Failure". New York Times. http://www.nytimes.com/2009/05/05/science/05tesla.html?hp. Retrieved 2009-05-05. "He eventually sold Wardenclyffe to satisfy $20,000 (today about $400,000) in bills at the Waldorf. In 1917, the new owners had the giant tower blown up and sold for scrap." ^ Research, Health (1996-09). Nikola Tesla Research. p. 9. ISBN 0787304042. http://books.google.com/?id=N0gD7HxMfsUC&printsec=frontcover#v=onepage&q&f=false. Retrieved 28 November 2010. ^ Seifer 2001, pp. 378 380^ Page, R.M., "The Early History of RADAR", Proceedings of the IRE, Volume 50, Number 5, May 1962, (special 50th Anniversary Issue).^ Prepared Statement by Nikola Tesla downloadable from www.tesla.hu^ New York Times, 11 July 1935, p 23, c.8^ New York Herald Tribune, 11 September 1932^ 1936 unpublished interview, quoted in Anderson, L, ed. Nikola Tesla: Lecture Before the New York Academy of Sciences. 6 April 1897 : The Streams of Lenard and Roentgen and Novel Apparatus for Their Production, reconstructed 1994^ "Tesla's Ray". Time. 23 July 1934. ^ "Tesla, at 78, Bares New 'Death-Beam'". New York Times. 11 July 1934. http://select.nytimes.com/gst/abstract.html?res=FB0817FD3E5B107A93C3A8178CD85F408385F9. ^ "Tesla Invents Peace Ray". New York Sun. 10 July 1934. ^ "Death-Ray Machine Described". New York Sun. 11 July 1934. ^ "A Machine to End War". Feb. 1935.^ a b Seifer 2001, p. 454^ "Beam to Kill Army at 200 Miles, Tesla's Claim on 78th Birthday". New York Times. 11 July 1934. ^ "'Death Ray' for Planes". New York Times. 22 September 1940. ^ "Aerial Defense 'Death-Beam' Offered to U. S. By Tesla" 12 July 1940^ O'Neill, John J.. "Tesla Tries To Prevent World War II (unpublished Chapter 34 of Prodigal Genius)". PBS. ^ Velox, Particle beam weapon. everything2.com^ Tesla, Nikola (1993). The