Karen: The mainstream physics viewpoint since Einstein has been that
1) Lightspeed in vacuum (C) is an 'absolute' speed (determined from Maxwell's equations for electromagnetism) so it is the same for every observer
2) You can't accelerate anything that has mass to C (it would take infinite energy) let alone beyond
3) As the relative speed between any two objects approaches C their relative time slows down (but does not 'go backward')
4) All this is 'special' (non-accelerated) relativity - 'general' relativity adds that gravity and motion curve spacetime, so that *very* fast moving objects in very high gravity fields might be able to 'warp space' and allow for true backwards time travel. But it's generally thought that you need the mass/energy of a star (or a black hole) to do this, so you could not get any time travel effects from anything electrical that we could see in the lab. And even some of the black hole people disagree on whether the 'time travel' seen in the equations would actually work in real life.
That's the mainstream view, as I said. But Townsend Brown seemed to hold to decidedly non-mainstream views of physics, which I still don't understand, so... if he thought time travel was possible with the energy budget we have on Earth, his thoughts *may* have agreed with Einstein's ideas but they certainly do NOT agree with current thinking on what Einstein's ideas imply in terms of energy requirements.
It's possible that either Einstein was wrong (he certainly knew his theories were incomplete) or that the post-Einstein relativists have gone wrong somewhere in what they've built on his ideas. In either case, it's not something the physics establishment will accept without a lot of proof.
There's one current physicist who believes it's possible to build a time machine - Ronald Mallet - (
http://en.wikipedia.org/wiki/Ronald_Mallett ) using lasers, but he's not generally believed.
However if the Townsend Brown 'fan' and 'speaker' can be demonstrated to literally bend space as Townsend Brown seemed to think (again, mainstream scientists do NOT believe this), then it would be strong proof that something IS wrong in either Einstein or the current understanding of Einstein.