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- Nikola Tesla patented the Tesla coil circuit on April 25, 1891. 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. 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". (en)
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- 0001-04-25 (xsd:gMonthDay)
- 0001-05-20 (xsd:gMonthDay)
- 3.15576E9 (dbd:second)
- Combined Tesla / D'Arsonval / Oudin electrotherapy and x-ray outfit 1907 (en)
- Light bulb powered wirelessly by "receiver" coil tuned to resonance with the huge "magnifying transmitter" coil at Tesla's Colorado Springs lab, 1899. (en)
- A violet ray wand, a handheld Tesla coil sold as a quack home medical device until about 1940. Said to cure everything from carbuncles to lumbago. (en)
- Coil in operation, at -12 million volts. The 10 ft diameter "extra" coil is shown. The 51 ft diameter secondary coil is visible dimly in background, and in the previous photo. (en)
- Discharge of same coil with a metal sphere capacitive terminal (en)
- Wardenclyffe Tower wireless station, essentially a huge Tesla coil intended as a prototype transatlantic radiotelegraphy and wireless power transmitter, built by Tesla at Shoreham, NY, 1901-1902. It was never completed. (en)
- Tesla's proposed wireless power system, from his 1897 patent. The transmitter ' consists of a Tesla coil ' driving an elevated capacitive terminal ' suspended by a balloon '. The receiver is a similar terminal and resonant transformer. (en)
- Electrotherapy treatment of diabetes with a vacuum electrode, 1922. The series spark gap is visible mounted on the front of the machine. (en)
- Primary circuit, showing oil capacitor bank ', 40 kV supply transformer and rotary spark gap ', and part of secondary winding (en)
- Diathermy of elbow 1945 (en)
- Vacuum electrode "violet ray" wand in operation. (en)
- Evangelist Irwin Moon shooting "lightning bolts" from fingers, 1938. (en)
- Demonstrating 10 inch brush discharge from hand, 1913 (en)
- Steps in Tesla's development of the Tesla transformer around 1892. Closed-core transformers used at low frequencies, rearranging windings for lower losses, removed iron core, partial core, final conical Tesla transformer, Tesla coil circuits (en)
- Elihu Thomson's Tesla coil, published February 1892, identical to Tesla's except for a compressed air spark blowout . (en)
- Powerful spark-gap transmitter, showing series spark gaps , Leyden jar capacitors , and resonant transformer (en)
- Henry Rowland's 1889 spark-excited resonant transformer, a predecessor to the Tesla coil. (en)
- Famous image of magnifying transmitter in operation with Tesla sitting next to it. This is a "trick" photo, a double exposure; Tesla was not in the room when the coil was operating. (en)
- Design on which the Wardenclyffe plant was based, from Tesla's 1902 patent (en)
- Tesla electrotherapy coil manufactured by Adolphe Gaiffe, around 1900. The primary capacitor is in the box; the spark gap is mounted on top. (en)
- Treatment of cancer with an Oudin coil , 1910. The induction coil that powers the Oudin coil is behind the patient's head. (en)
- Longwave spark diathermy machine using Tesla circuit, 1921. (en)
- Spark transmitter circuit from Marconi's 1900 patent. Its similarity to a Tesla coil can be seen; the only difference is the addition of a variable inductor to tune the antenna to resonance. (en)
- RF current from Tesla coil lights the bulb's filament as it passes through the wire to charge and discharge the performer's body, which acts as a capacitor plate. (en)
- Demonstration of inductance with a Tesla coil, 1906. RF current will not pass through the heavy copper wire because of the bend, and passes through the lamp instead. (en)
- Effluvation treatment of knee with an Oudin coil , a high voltage transformer similar to a Tesla coil, 1915 (en)
- "Electrice" sideshow performer being "electrocuted" 1914 (en)
- Small Tesla coil for electrotherapy, 1905. The Tesla transformer is immersed in a tank of oil for insulation to prevent arcs. (en)
- "Electrice" lighting a candle with brush discharge from her fingers. The current came from the electric chair she is touching, which is connected to the Tesla coil in the background. (en)
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| rdfs:comment
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- Nikola Tesla patented the Tesla coil circuit on April 25, 1891. 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. 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". (en)
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