This “gaseous” component was not atmospheric in the ordinary sense. It was not the result of adsorbed gases on the copper coil surface. This gas pulse travelled over the coil surfaces with super-luminal velocity. Mr. Dollard utilized line interferometry to measure and compare both components in a real Tesla Impulse Transformer, and has proven the vast velocity differences between both. Moreover, the mysterious surface-riding component was found to travel at a super-luminal velocity. Those experimental measurement successfully vindicated the claim of Tesla in this regards in 1985. When referring to these discharges and their strange attributes and effects, Tesla always used gas-dynamic terms and gas-dynamic analogues. Throughout his use of such terminology, Tesla was inferring that something unlike normal electricity was flowing through short electrical impulses.