An electric circuit which produces very high voltage alternating current
Henry Rowland's 1889 spark-excited resonant transformer,[1] a predecessor to the Tesla coil.[2]
Steps in Tesla's development of the Tesla transformer around 1892.[3] (1) Closed-core transformers used at low frequencies, (2-7) rearranging windings for lower losses, (8) removed iron core, (9) partial core, (10-11) final conical Tesla transformer, (12-13) Tesla coil circuits
Nikola Tesla patented the Tesla coil circuit on April 25, 1891.[4][5] and first publicly demonstrated it May 20, 1891 in his lecture "Experiments with Alternate Currents of Very High Frequency and Their Application to Methods of Artificial Illumination" before the American Institute of Electrical Engineers at Columbia College, New York.[6][7][8] Although Tesla patented many similar circuits during this period, this was the first that contained all the elements of the Tesla coil: high voltage primary transformer, capacitor, spark gap, and air core "oscillation transformer".
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