Title: Nikola Tesla
Content:  York City before he struck out on his own. With the help of partners to finance and market his ideas, Tesla set up laboratories and companies in New York to develop a range of electrical and mechanical devices. His alternating current (AC) induction motor and related polyphase AC patents, licensed by Westinghouse Electric in 1888, earned him a considerable amount of money and became the cornerstone of the polyphase system which that company eventually marketed. Attempting to develop inventions he could patent and market, Tesla conducted a range of experiments with mechanical oscillators/generators, electrical discharge tubes, and early X-ray imaging. He 
Title: Nikola Tesla
Content:  Nikola Tesla (, ; 1856 – 7 January 1943) was a Serbian-American  inventor, electrical engineer, mechanical engineer, and futurist best known for his contributions to the design of the modern alternating current (AC) electricity supply system. Born and raised in the Austrian Empire, Tesla studied engineering and physics in the 1870s without receiving a degree, gaining practical experience in the early 1880s working in telephony and at Continental Edison in the new electric power industry. In 1884 he emigrated to the United States, where he became a naturalized citizen. He worked for a short time at the Edison Machine Works in 
Title: The Inventions, Researches, and Writings of Nikola Tesla
Content:  Written in 1893, the book is a record of Tesla's pioneering activities, research, and works. Tesla is recognized as one of the foremost electrical researchers and inventors. At the time of publication, the book was the "bible" of every electrical engineer practicing the profession. The book contains Forty-three chapters, most of them on different areas of Tesla's research and inventions by Tesla. The first chapter is a brief biography while three chapters are transcripts of important lectures and one covers his section of Westinghouse's exhibit at the Chicago World's Fair Martin stated that, "No attempt whatever has been made here to emphasize the importance of his researches and discoveries". The ideas and inventions are conveyed in their own way, determining by their own place by intrinsic merit. But with the fact that Tesla blazed a path that electrical development would later follow for years to come, the compiler of the book endeavored to bring together all of Tesla's work up to that point in Tesla's life. Aside from indicating the range of his thought and originality of his mind, the book has historical value because it describes the scope of Tesla's early inventions.
Title: Wizard: The Life and Times of Nikola Tesla
Content:  Seifer follows the life of Nikola Tesla, the Serbian American Invention|inventor, electrical engineer, mechanical engineer, physicist, and futurist. He covers the high points of the inventor's life through his designs used in the modern alternating current system, experimentation with high frequency current and wireless power transmission, wireless remote control, X-ray imaging, and Tesla's "death ray". Seifer goes on to cover Tesla's downfall, attributing it to Tesla's megalomaniacal, neurotic, self-destructive tendencies, and Tesla's interactions with financier J. Pierpont Morgan. Seifer based his book largely on primary sourced documents including Tesla's writings and patents. Also including papers of Tesla's in the Tesla archives in Yugoslavia as well as manuscripts in the United States. Seifer filed Freedom of Information Act requests to get documents from the FBI and other United States government agencies.
Title: Nikola Tesla
Content:  American Institute of Electrical Engineers, May 1888. ; Selected Tesla Writings, Scientific papers and articles written by Tesla and others, spanning the years 1888–1940. ; Light Without Heat, The Manufacturer and Builder, January 1892, Vol. 24 ; Biography: Nikola Tesla, The Century Magazine, November 1893, Vol. 47 ; Tesla's Oscillator and Other Inventions, The Century Magazine, November 1894, Vol. 49 ; The New Telegraphy. Recent Experiments in Telegraphy with Sparks, The Century Magazine, November 1897, Vol. 55 Carlson, W. Bernard, "Inventor of dreams". Scientific American, March 2005 Vol. 292 Issue 3 p. 78(7). ; Jatras, Stella L., "The genius of 
Title: Nikola Tesla
Content:  Tesla". The New American, 28 July 2003 Vol. 19 Issue 15 p. 9(1) ; Lawren, B., "Rediscovering Tesla". Omni, March 1988, Vol. 10 Issue 6. ; Rybak, James P., "Nikola Tesla: Scientific Savant". Popular Electronics, 1042170X, November 1999, Vol. 16, Issue 11. ; Thibault, Ghislain, "The Automatization of Nikola Tesla: Thinking Invention in the Late Nineteenth Century". Configurations, Volume 21, Number 1, Winter 2013, pp. 27–52. ; Martin, Thomas Commerford, "The Inventions, Researches, and Writings of Nikola Tesla", New York: The Electrical Engineer, 1894 (3rd Ed.); reprinted by Barnes & Noble, 1995 ; Anil K. Rajvanshi, "Nikola Tesla – The 
Title: The Inventions, Researches, and Writings of Nikola Tesla
Content:  The Inventions, Researches and Writings of Nikola Tesla is a book compiled and edited by Thomas Commerford Martin detailing the work of Nikola Tesla through 1893. The book is a comprehensive compilation of Tesla's early work with many illustrations.
Title: Smiljan
Content: Nikola Tesla (1856–1943) – inventor and electrical engineer. He migrated to the United States in 1884. ; Ferdinand Kovačević (1838–1913) – inventor, engineer, and pioneer in telegraphy ; Edo Kovačević (1906–1993) – artist, member of the Croatian Academy of Sciences and Arts, and recipient of the Vladimir Nazor Award 
Title: Invention of radio
Content:  In 1898 Nikola Tesla developed a radio/coherer based remote-controlled boat, with a form of secure communication between transmitter and receiver, which he demonstrated in 1898. Tesla called his invention a "teleautomaton" and he hoped to sell it as a guided naval torpedo.
Title: The Man Who Invented the Twentieth Century
Content:  The Man Who Invented the Twentieth Century: Nikola Tesla, forgotten genius of electricity (ISBN: 0-7472-7588-2 : OCLC 40839685) is a 1999 book by Robert Lomas detailing the life of Nikola Tesla. Lomas covers the times of the electric engineer in the United States and the inventors' work.

Question: what was nikola tesla inventions?
Answer: Tesla coil.