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A Teslascope is a radio transceiver that was alleged to have been invented by Nikola Tesla for the purpose of communicating with life on other planets. Even though Tesla talked about interplanetary communications on many occasions, it has never been confirmed that he built this particular device.
The claim that Tesla created a device called a “Teslascope” grew out of Arthur H. Matthews' 1970 book, "The Wall of Light: Nikola Tesla and the Venusian space ship, the X-12" (OCLC 2094500). Matthews, who had apprenticed under Tesla at the turn of 20th the century and worked for him until Tesla's death in 1943, wrote that Tesla had designed it in order to communicate with extraterrestrial beings. Matthews made other more extravagant claims, such as Tesla having been born on Venus. This was supposedly told to him by "Venusians" who he said had visited him at his home in Lac Beauport, Quebec, Canada. Matthews also claimed that he built a model of a Teslascope in 1947 after Tesla’s death and operated it successfully, although it is hard to verify this claim since Matthews left unclear documentation of his work. Asked about the whereabouts of the Teslascope back in 1974, Matthews said a crew from the Royal Academy of Denmark came to take possession of the Teslascope.[not specific enough to verify]
Talking with the planets
Tesla had mentioned many times during his career that he thought his inventions such as his Tesla coil, used in the role of a "resonant receiver", could communicate with other planets. In 1896, Tesla told interviewers:
The possibility of beckoning Martians was the extreme application of [my] principle of propagation of electric waves. The same principle may be employed with good effects for the transmission of news to all parts of the earth....Every city on the globe could be on an immense circuit. [Thus] a message sent from New York would be in England, Africa and Australia in an instant. What a grand thing it would be.—Nikola Tesla, 
In 1899 while investigating atmospheric electricity using a Tesla coil receiver in his Colorado Springs lab Tesla observed repetitive signals, substantially different from the signals noted from storms and Earth noise, that he interpreted as being of extraterrestrial origin. He later recalled the signals appeared in groups of one, two, three, and four clicks together. Tesla thought the signals were coming from Mars. Analysis of Tesla's research has ranged from suggestions that Tesla detected nothing (he simply was misunderstanding the new technology he was working with) to claims that Tesla may have been observing naturally occurring Jovian plasma torus signals.
In 1901 Tesla said the following about his 1899 Colorado experiment:
I can never forget the first sensations I experienced when it dawned upon me that I had observed something possibly of incalculable consequences to mankind. . . . Although I could not decipher their meaning, it was impossible for me to think of them as having been entirely accidental. The feeling is constantly growing on me that I had been the first to hear the greeting of one planet to another.—Nikola Tesla, 
In Time magazine’s July 20, 1931 issue celebrating Tesla's 75th birthday Tesla stated:
[I have conceived] a means that will make it possible for man to transmit energy in large amounts, thousands of horsepower, from one planet to another, absolutely regardless of distance. I think that nothing can be more important than interplanetary communication. It will certainly come some day and the certitude that there are other human beings [at other locations] in the universe, working, suffering, struggling, like ourselves, will produce a magic effect on mankind and will form the foundation of a universal brotherhood that will last as long as humanity itself.—Nikola Tesla, 
- Carlson, W. Bernard (March 2005), "Inventor of Dreams", Scientific American: 85
- Aldrich, Lisa J. (May 31, 2005). Nikola Tesla and the Taming of Electricity. Greensboro, North Carolina: Morgan Reynolds Publishing. pp. 142–143. ISBN 978-1-931798-46-4. OCLC 56194706.
- Nelson, Robert A. (1997). "Communicating with Mars: The Experiments of Tesla & Hodowanec". Borderland Sciences Research Foundation, Inc. Retrieved 2007-05-28.
- "The Hyperdimensional Oscillator", unexplained-mysteries.com: By UM Reviews , Posted on 09.23.05
- "The Wall of Light: Nikola Tesla and the Venusian Space Ship, the X-12.". WorldCat. Retrieved 2007-04-17.
- Direct questioning by Marc Bedard
- Seifer, Marc J. (1996). "Martian Fever (1895-1896)". Wizard : the life and times of Nikola Tesla : biography of a genius. Secaucus, New Jersey: Carol Pub. p. 157. ISBN 978-1-55972-329-9. OCLC 33865102.
- "Is Tesla to Signal the Stars?". Electrical World. April 4, 1896. p. 369.
- Spencer, John (1991). The UFO Encyclopedia. New York: Avon Books. ISBN 978-0-380-76887-5. OCLC 26211869.
- Corum, Kenneth L.; James F. Corum (1996). Nikola Tesla and the electrical signals of planetary origin (PDF). p. 14. OCLC 68193760.
- Tesla, Nikola (February 19, 1901). "Talking with the Planets". Collier's Weekly. Retrieved 2007-05-04.
- "Tesla at 75". Time (magazine) 18 (3). July 20, 1931. p. 3.
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- Ratzlaff, John T.; Leland I. Anderson (1979). Dr. Nikola Tesla Bibliography. Palo Alto, California: Ragusan Press. pp. xi. ISBN 978-0-918660-08-4. OCLC 5661579.
- Matthews, Arthur H. (1971). The wall of light; Nikola Tesla and the Venusian space ship, the X-12. Mokelumne Hill, California: Health Research. OCLC 2094500.
- Nelson, Robert A. (1998). "Communicating with Mars: The Experiments of Tesla & Hodowanec". Rex Research. Retrieved 2007-04-16. This version contains pictures.