If you really want to understand how longitudinal waves can be transmitted, received and created through a medium you cannot be happier than discovering the work of George Constantinesco. He was a Romanian inventor who gave us a lasting legacy “The Theory of Sonics”, a new (in 1913) science of power transmission though Solids, Liquids and Gases. The same understanding of Teslas longitudinal electric wave can be engineered using Contantinescos mathematics and understanding. I have drawn a diagram of a possible impusle system of transmission, based on one of his patents, this could be built and replace a gearbox, drive shaft and differential from a vehicle. This is only a small design model for experimental purposes, so good luck and have fun if you choose to build it. Regards Arto