I use this classical measurement example to introduce wave velocity calculation in transmission lines for those not familiar with it. It is well know in radio and power engineering. The second part will show how the coiling Technic has a direct influence of wave velocity within a coax cable. I recommend to read the information below from the link. The understanding of these principles are crucial for efficient Tesla coil designs.
Long and short transmission lines
http://www.allaboutcircuits.com/vol_2/chpt_14/5.html
Tesla Coils and the Failure of Lumped-Element Circuit Theory
http://www.teslatechnologyresearch.com/corum/
