In 1834, Charles Wheatstone measured the velocity of electricity along two long wires, whereby he found a velocity of about 463,500 km/s, over 1.5 times the speed of light. In 1905, Nikola Tesla also measured a propagation speed for the telluric currents he transmitted trough the earth's surface of 471,240 km/s, remarkably close to Wheatsone's result and within 0.1% of pi/2 times the speed of light.

In order to validate the possibility of transmitting superluminal signals along a wire, we setup an experiment, similar in design to Wheatstone's, consisting of two relatively long wires which were excited by a capacitive discharge. Hereby, a mercury wetted relay was used as a switching element in order to obtain as fast a signal rise time as possible.

Quite surprisingly, the superluminal signal was detected and found to propagate at more than 1.8 times the speed of light. This is quite a lot faster than the theoretical pi/2 (1.57), which may be caused by the use of enamelled wire rather than unshielded wire.

I still need to work things further out, but you can take a look at the scope shots and setup to draw your own conclusions:

http://www.tuks.nl/wiki/index.php/Main/ObservingSuperluminalSignalPropagationAlongASingleWireTransmissionLine

Besides this experiment, I've also worked on a new aether theory, whereby the electromagnetic domain is fully integrated with the fluid dynamics domain and whereby all units of measurement are expressed in just three fundamental ones: mass, length and time, which would explain the existence of superluminal longitudinal "sound" waves in the aether:

Preprint Revision of Maxwell's Equations

In this work, there are 18 references to papers wherein superluminal signals were detected with various methods, such as microwave experiments as well as experiments with optical fibers.

So, the question is: is this actual additional evidence of the existence of Tesla's superluminal longitudinal waves, or did I measure an artifact?

Update: The measurement presented above (even though preliminary), together with the 18 references around detection of superluminal signals in my paper as well as the recent work of Steffen Kühn leave little doubt that the actual propagation speed of the electric field is superluminal rather than that it propagates at c:

Preprint Electronic data transmission at three times the speed of lig...

Article General Analytic Solution of the Telegrapher’s Equations and...

So, now we have two independent measurements of superluminal signal transmission along a transmission line. He has also pointed to the exact same problem in Maxwell's equations via a different path:

Preprint Proof of the inconsistency of the full set of Maxwell's equa...

Taking all of this together, there simply is no escape to the conclusion that Maxwell's equations are indeed wrong. One cannot get away with violating the fundamental theorem of vector calculus, which is undoubtedly called fundamental for a reason, and it seems to me that after 120+ years of attempting to correct this obvious flaw by extending the model, i.e. make it "complete" by trying to find additional equations (including multi-dimensional ones), maybe it's time to try something else, like simply fixing the actual problem and revise Maxwell's equations.

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