Old library documents disclose viewed demonstrations by attorney, stock holders, investors, Engineers, and newshounds, in Philadelphia for work in progress of musician and machine shop worker John W. Keely approx 1892, of his control of forces of nature such as lifting : - 2 ton steel tank , triple spinning sirens flywheels platform, and brass sphere. The tuning fork arrays delivered harmonics of resonant vibrations to mass worked on, and connected by pure wires he called "transmitters". The node junctions of silver, platinum, gold wires , with also wire clips added, caused disruptive upper inharmonics traveling down wire to mass experimented on. (interference with gravity waves) We nowadays call these thermocouples / peltier effect. Tesla knew Keely, and didn't like him. Keely got more investment monies than he did. A French scientist also had successfully raised and flew an OPEN dirigible frame with differing metals plates sandwiches at each end of craft, while connected to high frequency RF generator on board. (translation from French Babble Fish) - See Keely documents + Snell Manuscript.