I posted this thought on the Bessler forum but I think the message got lost in the argument I was trying to make, so I repeat the point here.
If Bessler was able to make his first three wheels turn at 50 RPM regardless of whether they were one or two-way wheels, why would he make his final and most robustly built one, only able to turn at about half the speed of the others?
My suggestion was that it was done in anticipation of the the long endurance test, so he could be sure that it would suffer less wear and tear because it would only have to to turn half the number of times, compared to the Merseberg wheel.
We know he claimed to be able to make wheels that could turn slowly or faster, so the slow rotation inherent in the Kassel wheel was deliberate. But there was a disadvantage to this decision, the slower RPM was less powerful, in my opinion, so he added extra weights on either side of the existing ones to give the wheel a little more power, and that is why the Kassel wheel was thicker than the Merseberg one, which was the same diameter, but only two-thirds the depth. It seems to me that a slower turning wheel might produce less power than a faster turning one? If so that would explain the extra depth to his wheel when compared to the Merseberg one - he needed to add some extra weights.
On the above understanding I suggest that it would be possible to produce a much faster turning wheel complete with extra weights that could generate the kind of power we seek for our modern electrical requirements.
JC
