This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Tesla coil Rankin Kennedy Electrical Installations Vol . medical version of Tesla coil from around called Gaiffe's Bipolar Resonator manufactured by Adolphe Gaiffe of Paris used in the obsolete medical field of electrotherapy The Tesla coil is resonant transformer circuit that produces very high voltage radio frequency alternating