An experiment in wireless power transmission by Nikola Tesla at his laboratory in Colorado Springs in 1899. This is a bank of lights attached to a large 50 foot wire loop antenna, receiving power from Tesla' Еще
"D'Arsonval apparatus", invented by French physicist and doctor Jacque Arsene D'Arsonval around 1890 used in an obsolete Victorian-era medical field called electrotherapy. It was a high frequency resonant "os Еще