The physics of the nodes and anti nodes are not in question. He questioned what is called 'standing waves'. The notion that harmonic waves are static and stand on the vibrating string. If this was true, his optical pickup placed at the bridge or fulcrum point, would be missing all these overtones. Hoag discovered this anomaly, from his invention in 1968. He could not fully explain how this optical pickup works within the standard explanation of how a vibrating string and its harmonics react.
Hoag did not go blindly into an attack against the physics of the vibrating string, but rather explain why his optical pickup works. After a year of research and experimentation in 1970, he made sense of this phenomenon and reapplied for his optical pickup patent. Much to his dismay, the patent examiner denied his claims and further stated, his circuit would not work. This of course was incorrect, for his optical pickups work very well.
Hoag has kept his secret, but now is offering his instruments for sale. All will be hand crafted by Hoag and will start at $1295 for the mono guitar and mono bass. The basic styles are seen in the attached photos. See more and order from their web site www.opticalguitars.com
For more information, go to www.opticalguitars.com