Oscillation option...

AC or DC. One hundred Serbian Dinars, that is probably more than the equivalent of what the man who's picture appears on the note had to his name: the man was celibate, fastidious, meticulous and who loved a pigeon ...and who's inventions would have made him the world's richest man by far - in fact one contract alone would have been enough to make him the world's first billionaire had it not been contrary to "his future vision of free power" - yet he died destitute and with significant debts: Nikola Tesla. Later in the same year of his death the US Supreme Court upheld Tesla's patent number i.e. reversing their previous reversal and recognizing him as the inventor of radio. [Wiki] Today is the 153rd anniversary of his birth, an odd number to be sure but one he would appreciate (divisible by 3, just one part of what is now assumed to be obsessive-compulsive disorder).

When his name is mentioned most think of radio wars (fighting with Marconi over the patent for the invention of radio) or the earlier Current Wars where he played a major part in the uptake of AC instead of DC (and getting revenge on Edison who had apparently "diddled him" whilst Tesla was in his employ) but there a multitude of lesser known works, stuff of science fiction: his papers were declared to be of national importance, all his effects were seized on the advice of presidential advisers and none other than J. Edgar Hoover who declared the case most secret because of the nature of Tesla's inventions and patents. Directed-energy weapon/peace ray/ death ray, call it what you will. He tried to prevent WWII and saw the "preventative possibilities in his new invention which embodied "death ray" characteristics". A system he said he had tried to sell...

...to Great Britain for $30,000,000 on the basis of his presentation that the device would provide complete protection for the British Isles against any enemy approaching by sea or air, and would provide an offensive weapon to which there was no defense."

Wow. Much talk of lightening balls and particle ray beam etc. Ideas that didn't necessarily go away with various reports of foo fighters during that war, or through the 80's but continue to this day. I digress, suffice to say he was most definitly one of the world's greatest inventors and a pioneer in his (electrical) field.

The oscillation option? As mentioned above Tesla is clearly thought of as an electrical genius but he was also responsible for a number of mechanical and other devices. One such was the Tesla Oscillator - his "Earthquake Machine". Apparently he once joked that he could split the Earth with one of these devices, and no-one ever knew if he was joking...!![credit to EclipseG - your page wouldn't load]