Funny you should say that -- I have been looking into methods of public flogging in 18th century Prussia as part of understanding how Doris Ritter would most likely have been treated. As far as I know, there are only two good contemporaneous pictures showing the
Staupenschlag (public dishonoring flogging by the hangman) in Prussia at the time, both by the same artist,
Daniel Chodowiecki. I have posted them before, but here they are again:
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They are quite different in detail as to how the culprit is fixed (a whipping post vs. free-standing dangling from an overhead hook or ring), the implement (cat o' nine tails vs the birch) and extent of nudity (although I think the flogged woman would have had at least a bare back in reality as flogging was never on covered skin). However both have in common that the body is at full stretch, standing on her toes with all muscles taut. The free-standing one has the legs tied at the ankles and possibly also the knees to minimise thrashing around. Clearly, Prussian hangmen agreed with your preference!
Same way of fixing on her tiptoes as in "Dead But Dreaming" (another 18th century setting), although Amy's whipping post looks a bit weedy:
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