Tesla had originally noticed what he described as "a very special radiation" years earlier when working his "carbon-button" lamp. He produced pictures he called "shadowgraphs" and had performed numerous experiments with them up until the fire at his lab. Upon learning of Röntgen's discovery, Tesla wrote him and sent some of the pictures recovered from the fire. Röntgen replied and asked Tesla how he produced them.
It is a simple feat of scientific electrical engineering — only expensive — blind, faint-hearted, doubting world.
The Tesla coil is a high frequency, high voltage, air core, resonant transformer. It differs from the more familiar low frequency, iron core transformer in many ways including the unique capability... continue reading »
The general object of my present invention is to secure artificially a difference of a quarter of a phase between the currents in the two energizing-circuits of an alternating-current electro-... continue reading »