Many researchers are now coming to believe that Nikola Tesla built a great deal of his technology off pioneer John Keely’s work.
Keely used finely tuned machines to create frequency and vibration to do amazing things such as acoustic levitation and energy synthesis while Tesla did essentially the same thing but he used electricity instead, which is much more flexible to tweak and alter than hand-built machines. Tesla came to America when Keely was at the height of his fame and perhaps he did learn a great deal from Keely.
This doesn’t take anything away from the work of Tesla, rather it credits him with real appreciation of the genius of Keely and the masters that Keely built off of such as Bach and Pythagoras. Keely as a musician first and a engineer scientist second.