I have only heard stories about this – how Tesla was testing it in downtown New York city, and created an earthquake that shattered windows for many blocks and caused a power outage as well. Since he was in the epicentre, he didn\’t have any idea of the effects he was having around him. They pinpointed the epicentre and came and stopped him, maybe even arrested him. I am not sure of those details. I would also like to hear from others\’ ideas as to what this device was about.