Just noticed something else...
In the Kassel wheel featuring the water screw, the various parts are all denoted by letters, a, b, c and so on, except for the support posts - which in the Mersburg engraving seem to have some kind of special relationship with the image borders - here, they're depicted with curved brackets seperating them from ceiling and floor, ostensibly to show the open nature of the config, but also assigned the number 10, rather than a letter.
I've pointed this out before, and JC's also mentioned it, suggesting it might be a 'w'... but i now realise it's actually another carry-over from
another image, this one:
...in much the same way he's transplanted the upper left wall bracket / trunion bearing for the pendulum, into the Mersburg woodcut. In that case, it seems to be hinting at torques applied to the 'stator', ie. the frame. Here however, the inclusion of these parts doesn't seem to imply any obvious change in context - they're just curved brackets, to show there's no hidden transmission or whatever.. surely?
Yet maybe they have more meaning.. in both the above image and the Kassel engraving, these upper and lower brackets have different height vs width dimensions - the lower brackets are narrower and taller. Why?
Note also that the right-side of the above image doesn't show any stand at all - the wheel's apparently supported only by an Indian rope trick...
..which duly ascends out the window...
Similarly, the left-side plan view of the Kassel engraving shows no stand for the axle. Granted, this is just a kind of 'exploded' view and the stand might seem like unnecessary clutter, but perhaps it also means something - stands are interesting because they're usually, by default, part of the stator that the rotor is torquing against. Given his assertions about the importance of being statorless, perhaps each of these various images, with their alternate left / right halves, are depicting changes in some fundamental condition, regarding Newton's 3rd..
Again, like the Mersburg engravings, in the above image, a line drawn directly from the top of the axle to the upper pulley would clip the top of the window, even though, this time, the wheel is much closer to the window..
In other words, he's compensated the geometry to preserve this special relationship between the wheel and pulleys as shown in the other images..
And on that point, note also that the rope coming down to the lower pulley is
not 'fastidiously' vertical - which would seem to challenge our presumption that the cut-out hole in post (4) is purely for stability.
And why not also site the lower pulley on one of these raised brackets, likewise eliminating that as a source of input energy from below?
I'm sure there's some kind of 'scheme' here - notice that in all three of these different depictions of the pulleys with the box hanging out the window, that as the box
descends, it torques the wheel in one direction, and that this angular acceleration in turn exerts a counter torque on the net system..
..and in all three cases, the box is on the
opposite side to that counter-torque - ie., if it was an OB load, and the whole system able to rotate in that direction, the counter-torque from spinning up the wheel is aligned in the opposite direction - if the OB torque's CW, then the inertial torque's CCW, and vice versa..
Maybe that's the basis of the 'scheme' here? Or something like this, dunno..