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 highfrequency apparatus Rankin Kennedy Electrical Installations Vol . D'Arsonval apparatus invented by French physicist and doctor Jacque Arsene D'Arsonval around used in an obsolete Victorianera medical field called electrotherapy It was high frequency resonant oscillation transformer similar to Tesla coil without the secondary