Well, I know what use this time machine could be....
In a previous post, it was said that if you would go back in time, the earth would no longer be there as it would continue forward in time, and continue moving through space...
Now, you need a lot of calculations, but you could figure out when to step into the machine where you are at the "leading edge" of the earth before going back in time. For a bad example, picture the earth as a baseball being thrown towards home plate. (For the sake of the example, assume it does not rotate)
On this earth-sized baseball, you are facing home plate as it travels. When the machine puts you back in time, you are where you were when the ball just left the pitchers hand, but the ball is actually in the catchers mitt.
Now, if you could go back in a time just a split second instead of an hour, you could leave the ball facing home plate and go back a split second in time to where the ball has moved one ball length toward home plate and you are on the side of the ball facing the PITCHER instead of home plate.
So, with a whole lot of calculations, this time machine becomes a one way matter transporter, from the "front" of the Earth to the "rear"
I hope I made my idea clear....Of course, I don't think this time machine will work, but if it did, this would be a nice use for it.
Crodley